TY - CHAP A1 - Meier, Martin A1 - Szabo, Peter A1 - Motuz, Vasyl A1 - Egbers, Christoph T1 - Strömungsfeldvisualisierung von thermo-elektrodynamischer Konvektion mit einer kombinierten PIV- und Schattentechnik T2 - Experimentelle Strömungsmechanik : 28. Fachtagung, 7.-9. September 2021, Bremen T2 - Flow field visualisation of thermo-electrodynamic convection utilising a combined PIV and Shadowgraph technique Y1 - 2021 SN - 978-3-9816764-7-1 SP - 6 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - THES A1 - Hasanuzzaman, Gazi T1 - Experimental investigation of turbulent boundary layer with uniform blowing at moderate and high Reynolds numbers N2 - Experimental investigation in turbulent boundary layer flows represents one of the canonical geometries of wall bounded shear flows. Utmost relevance of such experiments, however, is applied in the engineering applications in aerospace and marine industries. In particular, continuous effort is being imparted to explore the underlying physics of the flow in order to develop models for numerical tools and to achieve flow control. Within the scope of this Ph. D. topic, application of active control method such as micro-blowing effect in the incompressible, zero pressure gradient turbulent boundary layer was investigated. Turbulent boundary layer flow is particularly interesting as well as challenging due to the presence of different interacting scales which are increasingly becoming significant as the flow inertial conditions keeps growing. Therefore, energy content of the coherent structures in outer layer becomes stronger and necessitates measurements in relatively large Reynolds number. Present control experiments in turbulent boundary layer can be split into two different work segments, where one is objected towards the data measurements in turbulent boundary layer over smooth surface with and without any external perturbation. Here, perturbation is applied in the form of wall normal blowing while keeping the magnitude of blowing very low compared to the free stream velocity. For the subsequent results reported here, magnitude of blowing ratio was varied between 0%~6%. In the first part of the present thesis e.g. 0.415×10e+3≤Reτ≤1.160×10e+3, measurements were performed at the Brandenburg University of Technology wind tunnel. Non-intrusive Laser Doppler Anemometry was applied to carry out a series of measurements on a zero pressure gradient flat plate turbulent boundary layer. Blowing ratio through the perforated surface was varied between 0.17%~1.52% of the free stream velocity. To a maximum of 50% reduction in friction drag was achieved. For the measurements on the upper range of the stated Reynolds number, were conducted at the boundary layer wind tunnel. This boundary layer wind tunnel offers a spatially developed turbulent boundary layer over a flat plate within 2.2×10e+3≤Reτ≤5.5×10e+3 with an excellent spatial resolution. With the help of Stereo Particle Image Velocimetry technique, measurement of the velocity components were obtained covering entire boundary layer in streamwise wall normal plane. In addition, time resolved measurements were also obtained in spanwise and wall-normal plane in order to look into the morphology of turbulent structures immediately above the blowing area. KW - Turbulent boundary layers KW - Drag reduction KW - Flow control KW - Particle Image Velocimetry Y1 - 2021 U6 - https://doi.org/10.26127/BTUOpen-5566 PB - BTU CY - Cottbus-Senftenberg ER - TY - GEN A1 - Le Gal, Patrice A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Le Dizès, Stéphane A1 - Chen, J. A1 - Favier, Benjamin T1 - Instability of vertically stratified horizontal plane Poiseuille flow T2 - Journal of Fluid Mechanics Y1 - 2021 U6 - https://doi.org/10.1017/jfm.2020.917 SN - 1469-7645 SN - 0022-1120 VL - 907 IS - R1 SP - 1 EP - 14 ER - TY - GEN A1 - Hallol, Zeinab A1 - Yousry, Mohamed A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Time-resolved PIV measurements in fully developed turbulent pipe flow T2 - 25th International Congress of Theoretical and Applied Mechanics Milan (Italy), 22-27 August 2021 Y1 - 2021 UR - https://iutam.org/publications/ictam-proceedings/ictam_2020/ SN - 978-83-65550-31-6 SP - 1374 EP - 1375 ER - TY - GEN A1 - Szabo, Peter A1 - Meyer, Antoine A1 - Meier, Martin A1 - Motuz, Vasyl A1 - Sliavin, Yaraslau A1 - Egbers, Christoph T1 - Simultaneous PIV and shadowgraph measurements of thermo-electrohydrodynamic convection in a differentially heated annulus T2 - Technisches Messen Y1 - 2022 U6 - https://doi.org/10.1515/teme-2021-0120 SN - 2196-7113 VL - 89 IS - 3 SP - 148 EP - 157 ER - TY - GEN A1 - Hallol, Zeinab A1 - Yousry, Mohamed A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Effect of High Reynolds Number on the Behaviour of Large and Very Large Scale Motions in Fully Developed Turbulent Pipe Flow T2 - Fluid Dynamics Y1 - 2022 UR - https://link.springer.com/article/10.1134/S0015462822040048 U6 - https://doi.org/10.1134/S0015462822040048 SN - 0015-4628 SN - 1573-8507 VL - 57 IS - 4 SP - 524 EP - 537 ER - TY - GEN A1 - Hasanuzzaman, Gazi A1 - Merbold, Sebastian A1 - Motuz, Vasyl A1 - Egbers, Christoph T1 - Enhanced outer peaks in turbulent boundary layer using uniform blowing at moderate Reynolds number T2 - Journal of Turbulence Y1 - 2022 U6 - https://doi.org/10.1080/14685248.2021.2014058 SN - 1468-5248 VL - 23 IS - 1-2 SP - 68 EP - 95 ER - TY - GEN A1 - Hallol, Zeinab A1 - Yousry, Mohamed A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Experimental investigation to study energetic structures in pipe flow at high Reynolds numbers using POD analysis T2 - Journal of the Physical Society of Japan Y1 - 2022 U6 - https://doi.org/10.7566/JPSJ.91.094401 SN - 0031-9015 VL - 91 IS - 9 SP - 1 EP - 10 ER - TY - GEN A1 - Harlander, Uwe A1 - Borcia, Ion-Dan A1 - Vincze, Miklos A1 - Rodda, Costanza T1 - Probability Distribution of Extreme Events in a Baroclinic Wave Laboratory Experiment T2 - Fluids N2 - Atmospheric westerly jet streams are driven by temperature differences between low and high latitudes and the rotation of the Earth. Meandering jet streams and propagating Rossby waves are responsible for the variable weather in the mid-latitudes. Moreover, extreme weather events such as heat waves and cold spells are part of the jet stream dynamics. For many years, a simple analog in the form of a simplified laboratory experiment, the differentially heated rotating annulus, has provided insight into the dynamics of the meandering jet stream. In the present study, probability density distributions of extreme events from a long-term laboratory experiment are studied and compared to the atmospheric probability density distributions. Empirical distributions of extreme value monthly block data are derived for the experimental and atmospheric cases. Generalized extreme value distributions are adjusted to the empirical distributions, and the distribution parameters are compared. Good agreement was found, but the distributions of the experimental data showed a shift toward larger extreme values, and some explanations for this shift are suggested. The results indicate that the laboratory model might be a useful tool for investigating changes in extreme event distributions due to climate change. In the laboratory context, the change can be modeled by an increase in total temperature accompanied by a reduction in the radial heat contrast. Y1 - 2022 U6 - https://doi.org/10.3390/fluids7080274 SN - 2311-5521 VL - 7 IS - 8 ER - TY - GEN A1 - Rodda, Costanza A1 - Harlander, Uwe A1 - Vincze, Miklos T1 - Jet stream variability in a polar warming scenario – a laboratory perspective T2 - Weather and Climate Dynamics Y1 - 2022 UR - https://wcd.copernicus.org/articles/3/937/2022/ U6 - https://doi.org/10.5194/wcd-3-937-2022 SN - 2698-4016 VL - 3 IS - 3 SP - 937 EP - 950 ER - TY - CHAP A1 - Sliavin, Yaraslau A1 - Szabo, Peter A1 - Früh, Wolf-Gerrit A1 - Schulze, Björn A1 - Egbers, Christoph T1 - Utilizing infrared thermography to investigate baroclinic instability in the differentially heated rotating annulus T2 - GALA-Fachtagung "Experimentelle Strömungsmechanik", 6.- 8. September 2022, Ilmenau Y1 - 2022 UR - https://www.researchgate.net/publication/363896369_GALA_Conference_2022_06_-_0809_Utilizing_infrared_thermography_to_investigate_baroclinic_instability_in_the_differentially_heated_rotating_annulus U6 - https://doi.org/10.13140/RG.2.2.32413.59360 SP - 49.1 EP - 49.8 ER - TY - CHAP A1 - Strangfeld, Matthias A1 - Bölük, Oguzhan A1 - Szabo, Peter A1 - Meier, Martin A1 - Meyer, Antoine A1 - Sliavin, Yaraslau A1 - Motuz, Vasyl A1 - Egbers, Christoph T1 - Thermo-electrohydrodynamic convection in a dielectric fluid layer with volumetric heating T2 - GALA-Fachtagung "Experimentelle Strömungsmechanik", 6.- 8. September 2022, Ilmenau Y1 - 2022 UR - https://www.researchgate.net/publication/363615870_Thermo-electrohydrodynamic_convection_in_a_dielectric_fluid_layer_with_volumetric_heating SP - 43.1 EP - 43.8 ER - TY - GEN A1 - Szabo, Peter A1 - Gaillard, Yann A1 - Haun, P. A1 - Carter, R. A1 - Adrian, A. A1 - Sliavin, Yaraslau A1 - Zaussinger, Florian A1 - Egbers, Christoph T1 - AtmoFlow - Investigating large scale convection in planetary atmospheres T2 - 27th European Low Gravity Research Association Biennial Symposium and General Y1 - 2022 UR - https://www.elgra2022.es/bookofabstractselgra2022 SP - 92 EP - 93 ER - TY - GEN A1 - Meier, M. A1 - Meyer, Antoine A1 - Motuz, Vasyl A1 - Sliavin, Yaraslau A1 - Bista, T. R. A1 - Strangfeld, Matthias A1 - Szabo, Peter A1 - Egbers, Christoph T1 - Dielectrophoretic induced convection in a sounding rocket flight T2 - Tagung: 27th European Low Gravity Research Association Biennial Symposium and General Y1 - 2022 UR - https://www.elgra2022.es/pages/congresos/elgra2022/bookofabstractselgra2022 SP - 37 ER - TY - GEN A1 - Meyer, Antoine A1 - Meier, Martin A1 - Szabo, Peter A1 - Sliavin, Yaraslau A1 - Egbers, Christoph A1 - Gerstner, Philipp A1 - Motuz, Vasyl A1 - Roller, Jonas A1 - Heuveline, Vincent T1 - Stability of a dielectric liquid confined in a differentially heated vertical Taylor-Couette system with applied radial electric field T2 - International Symposium on Bifurcations and Instabilities in Fluid Dynamics Y1 - 2022 UR - https://www.bifd2022.org/scientific-programme SP - 23 ER - TY - GEN A1 - Szabo, Peter A1 - Gaillard, Yann A1 - Egbers, Christoph T1 - Thermo-electrohydrodynamic (TEHD) convection in rotating spherical gap: A 2D-numerical simulation of the AtmoFlow sphere T2 - European Fluid Mechanics Conference EFMC14 Y1 - 2022 UR - https://www.erasmus.gr/microsites/1240/scientific-programme SP - 37 ER - TY - GEN A1 - Szabo, Peter A1 - Früh, Wolf-Gerrit T1 - Effect of intrinsic thermomagnetic convective timescales on the response to periodic modulation of external forcing parameters T2 - European Fluid Mechanics Conference EFMC14 Y1 - 2022 UR - https://www.erasmus.gr/microsites/1240/scientific-programme SP - 35 ER - TY - GEN A1 - Meyer, Antoine A1 - Meier, M. A1 - Szabo, Peter A1 - Sliavin, Yaraslau A1 - Motuz, Vasyl A1 - Gerstner, Philipp A1 - Roller, Jonas A1 - Heuveline, Vincent A1 - Egbers, Christoph T1 - Thermoelectric instability of a dielectric fluid in a cylindrical annulus with vertical or horizontal orientation T2 - European Fluid Mechanics Conference EFMC14 Y1 - 2022 UR - https://www.erasmus.gr/microsites/1240/scientific-programme SP - 37 ER - TY - GEN A1 - Hasanuzzaman, Gazi A1 - Eivazi, Hamidreza A1 - Merbold, Sebastian A1 - Egbers, Christoph A1 - Vinuesa, Ricardo T1 - Enhancement of PIV measurements via physics-informed neural networks T2 - Measurement Science and Technology Y1 - 2022 UR - https://iopscience.iop.org/article/10.1088/1361-6501/aca9eb U6 - https://doi.org/10.1088/1361-6501/aca9eb SN - 1361-6501 ER - TY - GEN A1 - Meyer, Antoine A1 - Yoshikawa, Harunori A1 - Szabo, Peter A1 - Meier, Martin A1 - Egbers, Christoph A1 - Mutabazi, Innocent T1 - Thermoelectric instabilities in a circular Couette flow T2 - Philosophical transactions of the Royal Society. Series A, Mathematical, physical and engineering sciences Y1 - 2023 U6 - https://doi.org/10.1098/rsta.2022.0139 SN - 1471-2962 SN - 1364-503X VL - 381 IS - 2243 ER - TY - GEN A1 - Meyer, Antoine A1 - Meier, Martin A1 - Motuz, Vasyl A1 - Egbers, Christoph T1 - Thermo-electric convection in a cylindrical annulus during a sounding rocket flight T2 - Journal of Fluid Mechanics Y1 - 2023 U6 - https://doi.org/10.1017/jfm.2023.677 SN - 0022-1120 VL - 972 IS - A26 ER - TY - GEN A1 - Panahandeh, Sara A1 - May, Daniel A1 - Grosse-Kockert, Corina A1 - Schacht, Ralph A1 - Abo Ras, Mohamad A1 - Wunderle, Bernhard T1 - Pulsed infrared thermal imaging as inline quality assessment tool T2 - Microelectronics Reliability N2 - Pulsed infrared thermography (PIRT) is a very fast and non-destructive technique for testing various types of specimens. This makes PIRT interesting for 100 %-inspections in industrial production lines. Especially for the die attach interface inspection of sintered and soldered electronic components and layer-to-layer interfaces in fiber-reinforced plastic (FRP), the industry is looking for alternatives to cost intensive X-ray methods and the time-consuming scanning acoustic microscopy (C-SAM). A big challenge to use the PIRT technology for inspections in industrial production lines is the low emissivity of the surface of the device under test (DUT). This work will present a PIRT system including a vacuum foil lamination setup to avoid the necessary spray coating of DUTs with low emissivity surfaces in failure analyses. This system can be used as inline quality assessment tool with an integrated technique to perform reliable component inspections on a wide range of different specimens. KW - Pulsed infrared thermography; Non-destructive technique; Sintered and soldered electronic components; Production line; Failure analysis Y1 - 2023 U6 - https://doi.org/10.1016/j.microrel.2023.114910 SN - 0026-2714 VL - 2023 IS - Volume 142 SP - 1 EP - 11 ER - TY - GEN A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Barille, Regis A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. T1 - Production of novel Zr–Mg nanoceramics based on kaolinite clay with strong antibacterial activity T2 - Ceramics International N2 - Gram-negative bacteria Pseudomonas putida, Gram-positive Bacillus subtilis, and Staphylococcus aureus were utilized as test samples to evaluate the antibacterial characteristics of DD3-clay/MgO and DD3+38 wt% ZrO2-clay/MgO nanoparticles. The ceramic powders prepared by a thermal autoclave method are characterized before and after Mg addition by SEM, EDX, XRD, IR, UV–visible, and TEM in order to investigate microstructure, phase, and surface morphology. The results showed that after adding Mg, it led to the deformation of the crystal lattices of (mullite, zirconium silicate, and zirconium oxide) together with a decrease in particle size (75–103 nm) and a complete change in its shape from nanotube to nanospherical, as observed by SEM and TEM analyses. It also confirmed by UV–visible spectroscopy that the addition of Mg increases the absorbance accompanying a decrease in the energy gap of 1.91, 1.74, 1.73, and 1.43 eV corresponding to DD3, DD3Z, DD3/30 wt% Mg and DD3Z/30 wt% Mg respectively. The antibacterial mechanism is related to the size of the particles, the solvent used for powder dissolution, the nanoparticle's size when they come into touch with bacteria, and the generation of reactive oxygen species (ROS: ˙O2−, ˙OH, and H2O2). It was observed that the anti-bacterial activity is enhanced with 10 wt% and 30 wt% of Mg added to a modified ceramic powder. Also, more O2− is formed on the surface of the prepared powder, which penetrates the bacterial cell and destroys it. The nanocomposite particles showed remarkable antibacterial activity when they were dissolved in DMSO compared to methanol and chloroform as organic solvents. The aim is to enrich knowledge on the antibacterial activities of metal nanoparticles (ZrSiO4 and MgO) on three bacterial strains with different Grams due to their extensive involvement in the phenomena of contamination and infection encountered in the medical field. The synthesized nanoparticles have good antimicrobial activity against all strains tested. A maximum inhibition zone of 35 ± 0.2 mm was obtained with S. aureus, a zone of 23 ± 0.46 mm with P. putida and a zone of 27 ± 0.46 nm with B. subtilis for DD3/30 wt% Mg and an inhibition zone of 38 ± 0.93 mm, 26 ± 0.24 nm and 17 ± 0.33 nm was obtained with same strains for DD3Z/30 wt% Mg, respectively. KW - DD3 + 38 wt% ZrO2/Mg KW - Nanoparticles KW - Synthesis KW - Antibacterial activity KW - Transmission electron microscope KW - Nanomaterial Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1016/j.ceramint.2024.05.091 SN - 1873-3956 VL - 50 IS - 16 SP - 27949 EP - 27960 PB - Elsevier ER - TY - GEN A1 - Gaillard, Yann A1 - Szabo, Peter A1 - Travnikov, Vadim A1 - Egbers, Christoph T1 - Modelling Thermo-Electrohydrodynamic Convection in Rotating Spherical Shell Using OpenFOAM ® T2 - OpenFOAM® Journal Y1 - 2025 U6 - https://doi.org/10.51560/ofj.v5.136 VL - 5 (2025) SP - 1 EP - 16 ER - TY - GEN A1 - Hamede, Mohammed Hussein A1 - Roller, Jonas A1 - Meyer, Antoine A1 - Heauveline, Vincent A1 - Egbers, Christoph T1 - Dielectrophoretic force-enhanced thermal convection within a horizontal cylindrical annulus T2 - Physics of Fluids Y1 - 2024 U6 - https://doi.org/10.1063/5.0234772 VL - 36 IS - 12 SP - 1 EP - 14 PB - AIP Publishing ER - TY - GEN A1 - Hasanuzzaman, Gazi A1 - Egbers, Christoph T1 - Flow control of a turbulent boundary layer using uniform blowing T2 - Progress in Turbulence X : Proceedings of the iTi Conference on Turbulence 2023 Y1 - 2024 SN - 978-3-031-55924-2 SN - 978-3-031-55923-5 U6 - https://doi.org/10.1007/978-3-031-55924-2_36 ER - TY - GEN A1 - Borcia, Ion-Dan A1 - Richter, Sebastian A1 - Borcia, Rodica A1 - Schön, Franz-Theo A1 - Harlander, Uwe A1 - Bestehorn, Michael T1 - Wave propagation in a circular channel: sloshing and resonance T2 - The European Physical Journal Special Topics N2 - Surface wave resonance of a liquid (water) layer confined in a circular channel is studied both experimentally and numerically. For the experiment, eight unevenly distributed ultrasonic distance sensors measure the local height of the wave surface. The resonance curves show maxima only for odd multiples of the fundamental resonance frequency . We explained this behavior using a simple intuitive “ping-pong” like model. Collision of wave fronts can be observed for higher frequencies. Also, the wave reflection on the walls can be treated as wave collision with itself. The non-linearity seems to be weak in our study so the delay in the wave propagation before and after the collision is small. Time-space plots show localized propagating waves with high amplitudes for frequencies near resonance. Between the peaks low amplitude and harmonic patterns are observed. However, for higher frequencies, the frequency band for localized waves becomes wider. In the Fourier space-time plane, this can be observed as a point for the harmonic patterns or a superposition of two lines: one line parallel to wave-vector k axis corresponding to the excitation frequency and a second line with inclination given by wave propagation velocity . For planned future work, this result will help us to reconstruct the whole water surface elevation using time-series from only a few measurement points Y1 - 2023 UR - https://link.springer.com/article/10.1140/epjs/s11734-023-00790-z U6 - https://doi.org/10.1140/epjs/s11734-023-00790-z SN - 1951-6401 SN - 1951-6355 VL - Vol. 232 IS - 4 SP - 461 EP - 468 ER - TY - GEN A1 - Schön, Franz-Theo A1 - Bestehorn, Michael T1 - Instabilities and pattern formation in viscoelastic fluids T2 - The European Physical Journal Special Topics Y1 - 2023 UR - https://link.springer.com/article/10.1140/epjs/s11734-023-00792-x U6 - https://doi.org/10.1140/epjs/s11734-023-00792-x SN - 1951-6401 VL - Vol. 232 IS - 4 SP - 375 EP - 383 ER - TY - CHAP A1 - Merbold, Sebastian A1 - Hasanuzzaman, Gazi A1 - Buchwald, Tom A1 - Schunk, Christoph A1 - Schmeling, Daniel A1 - Volkmann, André A1 - Brinkema, Robert A1 - Hampel, Uwe A1 - Schröder, Andreas A1 - Egbers, Christoph ED - Cierpka, Christian T1 - Reference experiment for aerosol particle transport for dynamic situations T2 - Experimentelle Strömungsmechanik : 29. Fachtagung, 6.-8. September 2022, Ilmenau T2 - Referenzexperiment zum Aerosolpartikel-Transport für dynamische Situationen Y1 - 2022 UR - https://www.gala-ev.org/images/Beitraege/Beitraege2022/pdf/09.pdf SN - 978-3-9816764-8-8 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - CHAP A1 - Hamede, Mohammed Hussein A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Formation of flow patterns in a counter-rotating very wide gap Taylor-Couette flow (η = 0.1) T2 - Experimentelle Strömungsmechanik : 29. Fachtagung, 6.-8. September 2022, Ilmenau T2 - Bildung von Strömungsstrukturen in einem gegenrotierenden Taylor-Couette System mit sehr weitem Spalt (η = 0.1) Y1 - 2022 UR - https://www.gala-ev.org/images/Beitraege/Beitraege2022/pdf/48.pdf SN - 978-3-9816764-8-8 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - CHAP A1 - Merbold, Sebastian A1 - Kumar, Chandana B.V. A1 - Egbers, Christoph T1 - Transparent water tunnel for educational purpose of fundamental flow phenomena and Laser-optical measurement techniques T2 - Experimentelle Strömungsmechanik : 29. Fachtagung, 6.-8. September 2022, Ilmenau T2 - Transparenter Wasserkanal zum Lehrzweck grundlegendener Strömungsphänome und Laser-optischen Messtechniken Y1 - 2022 UR - https://www.gala-ev.org/images/Beitraege/Beitraege2022/pdf/53.pdf SN - 978-3-9816764-8-8 PB - Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V. CY - Karlsruhe ER - TY - THES A1 - Rodda, Costanza T1 - Gravity wave emission from jet systems in the differentially heated rotating annulus experiment Y1 - 2019 SN - 978-3-7369-7110-3 PB - Cuvillier Verlag CY - Göttingen ET - 1. Auflage ER - TY - GEN A1 - Hamede, Mohammed Hussein A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Transition to the ultimate turbulent regime in a very wide gap Taylor-Couette flow (η = 0.1) with a stationary outer cylinder T2 - EPL (Europhysics Letters) Y1 - 2023 U6 - https://doi.org/10.1209/0295-5075/acdea1 SN - 1286-4854 VL - 143 IS - 2 ER - TY - GEN A1 - Richter, Stefan A1 - Zanoun, El-Sayed A1 - Peixinho, Jorge A1 - Egbers, Christoph T1 - Pipe Flow Development and Transition in CoSmaPipe Facility T2 - Proceedings in applied mathematics and mechanics : PAMM Y1 - 2023 U6 - https://doi.org/10.1002/pamm.202300001 SN - 1617-7061 N1 - 92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) May 2023 VL - 23 IS - 1 ER - TY - GEN A1 - Barry, Elhadj A1 - Yoshikawa, Harunori A1 - Kang, Changwoo A1 - Meyer, Antoine A1 - Meier, Martin A1 - Crumeyrolle, Olivier A1 - Egbers, Christoph A1 - Mutabazi, Innocent T1 - Thermoelectric convection in a planar capacitor: theoretical studies and experiments in parabolic flights T2 - Comptes Rendus Mécanique Y1 - 2023 UR - https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.5802/crmeca.143/ SN - 1873-7234 SP - 1 EP - 15 ER - TY - GEN A1 - Gaillard, Yann A1 - Szabo, Peter A1 - Travnikov, Vadim A1 - Egbers, Christoph T1 - Thermo-electrohydrodynamic convection in a rotating shell with central force field T2 - International Journal of Heat and Mass Transfer Y1 - 2024 U6 - https://doi.org/10.1016/j.ijheatmasstransfer.2023.124760 SN - 0017-9310 VL - Vol. 2018 SP - 1 EP - 12 ER - TY - GEN A1 - Zanoun, El-Sayed A1 - Dewidar, Yasser A1 - Egbers, Christoph T1 - Reynolds number dependence of azimuthal and streamwise pipe flow structures T2 - Journal of Fluid Mechanics Y1 - 2023 U6 - https://doi.org/10.1017/jfm.2023.700 SN - 0022-1120 VL - Vol. 973 SP - 1 EP - 36 ER - TY - GEN A1 - Szabo, Peter A1 - Gaillard, Yann A1 - Zaussinger, Florian A1 - Egbers, Christoph T1 - Thermo-electrohydrodynamic convection in a differentially heated shell with electric central force field T2 - Proceedings in applied mathematics and mechanics : PAMM Y1 - 2023 U6 - https://doi.org/10.1002/pamm.202200121 SN - 1617-7061 N1 - 92nd Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM) VL - 23 IS - 1 ER - TY - GEN A1 - Hamede, Mohammed Hussein A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Experimental investigation of turbulent counter-rotating Taylor–Couette flows for radius ratio η = 0.1 T2 - Journal of Fluid Mechanics Y1 - 2023 U6 - https://doi.org/10.1017/jfm.2023.392 SN - 1469-7645 VL - 964 SP - A36-1 EP - A36-29 ER - TY - GEN A1 - Labarbe, Joris A1 - Le Gal, Patrice A1 - Harlander, Uwe A1 - Le Dizès, Stéphane A1 - Favier, Benjamin T1 - Localized layers of turbulence in stratified horizontally sheared Poiseuille flow T2 - Fluid Dynamics Y1 - 2023 UR - https://arxiv.org/abs/2207.09131 ER - TY - GEN A1 - Harlander, Uwe A1 - Sukhanovskii, Andrei A1 - Abide, Stéphane A1 - Borcia, Ion-Dan A1 - Popova, Elene A1 - Rodda, Costanza A1 - Vasiliev, Andrei A1 - Vincze, Miklos T1 - New Laboratory Experiments to Study the Large-Scale Circulation and Climate Dynamics T2 - Atmosphere N2 - The large-scale flows of the oceans and the atmosphere are driven by a non-uniform surface heating over latitude, and rotation. For many years scientists try to understand these flows by doing laboratory experiments. In the present paper we discuss two rather new laboratory experiments designed to study certain aspects of the atmospheric circulation. One of the experiments, the differentially heated rotating annulus at the Brandenburg University of Technology (BTU) Cottbus, has a cooled inner cylinder and a heated outer wall. However, the structure of the atmospheric meridional circulation motivates a variation of this “classical” design. In the second experiment described, operational at the Institute of Continuous Media Mechanics (ICMM) in Perm, heating and cooling is performed at different vertical levels that resembles more the atmospheric situation. Recent results of both experiments are presented and discussed. Differences and consistencies are highlighted. Though many issues are still open we conclude that both setups have their merits. The variation with heating and cooling at different levels might be more suited to study processes in the transition zone between pure rotating convection and the zone of westerly winds. On the other hand, the simpler boundary conditions of the BTU experiment make this experiment easier to control. Y1 - 2023 UR - https://www.mdpi.com/2073-4433/14/5/836 U6 - https://doi.org/10.3390/atmos14050836 VL - 14 IS - 5 ER - TY - GEN A1 - Maltese Meletti de Oliveira, Gabriel A1 - Abide, Stéphane A1 - Viazzo, Stephane A1 - Harlander, Uwe T1 - A parameter study of strato-rotational low-frequency modulations: impacts on momentum transfer and energy distribution T2 - Philosophical transactions of the Royal Society : Series A, Mathematical, physical and engineering sciences Y1 - 2023 U6 - https://doi.org/10.1098/rsta.2022.0297 SN - 1364-503X SN - 1471-2962 VL - 381 IS - 2246 ER - TY - GEN A1 - Merbold, Sebastian A1 - Hamede, Mohammed Hussein A1 - Froitzheim, Andreas A1 - Egbers, Christoph T1 - Flow regimes in a very wide-gap Taylo-Couette flow with counter rotating cylinders T2 - Philosophical transactions of the Royal Society : Series A, Mathematical, physical and engineering sciences Y1 - 2023 U6 - https://doi.org/10.1098/rsta.2022.0113 SN - 1364-503X SN - 1471-2962 VL - 381 IS - 2246 ER - TY - GEN A1 - Hamede, Mohammed Hussein A1 - Merbold, Sebastian A1 - Egbers, Christoph T1 - Experimental methods for investigating the formation of flow patterns in a very wide gap Taylor-Couette flow ($\eta=0.1$) T2 - tm - Technisches Messen Y1 - 2023 U6 - https://doi.org/10.1515/teme-2022-0107 SN - 2196-7113 VL - 90 IS - 5 SP - 332 EP - 339 ER - TY - GEN A1 - Merbold, Sebastian A1 - Hasanuzzaman, Gazi A1 - Buchwald, Tom A1 - Schunk, Christoph A1 - Schmeling, Daniel A1 - Volkmann, André A1 - Brinkema, Robert A1 - Hampel, Uwe A1 - Schröder, Andreas A1 - Egbers, Christoph T1 - Reference experiment on aerosol particle transport for dynamic situations T2 - tm - Technisches Messen Y1 - 2023 U6 - https://doi.org/10.1515/teme-2022-0118 SN - 2196-7113 VL - 90 IS - 5 ER - TY - GEN A1 - Gaillard, Yann A1 - Szabo, Peter A1 - Egbers, Christoph T1 - AtmoFlow: Thermo-electrohydrodynamic convection in the thermally driven spherical shell with differential rotation T2 - EGU General Assembly 2023 Y1 - 2023 U6 - https://doi.org/10.5194/egusphere-egu23-1841 ER - TY - GEN A1 - Buchwald, Tom A1 - Hasanuzzaman, Gazi A1 - Merbold, Sebastian A1 - Schanz, Daniel A1 - Egbers, Christoph A1 - Schröder, Andreas T1 - Large-scale flow field and aerosol particle transport investigations in a classroom using 2D-Shake-The-Box Lagrangian Particle Tracking T2 - Heliyon Y1 - 2023 U6 - https://doi.org/10.1016/j.heliyon.2023.e22826 SN - 2405-8440 VL - 9 IS - 12 ER - TY - GEN A1 - Hasanuzzaman, Gazi A1 - Egbers, Christoph T1 - Application of machine learning for sustainable aviation : the role of friction drag and flow control in turbulent boundary layer flows T2 - The 2nd International Conference on Advancing Sustainable Futures (ICASF 2024) Y1 - 2024 U6 - https://doi.org/10.13140/RG.2.2.31060.92807 SP - 1 EP - 8 ER - TY - THES A1 - Hamede, Mohammed Hussein Haytham T1 - The turbulent very wide-gap Taylor-Couette flow : experimental investigation Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-64456 ER - TY - THES A1 - Shahirpour, Amir T1 - A characteristic dynamic mode decomposition to detect transport-dominated large-scale coherent structures in turbulent wall-bounded flows Y1 - 2024 U6 - https://doi.org/10.26127/BTUOpen-6958 ER -