@misc{BacherRiebelMedinaMendezetal., author = {Bacher, Christian and Riebel, Ulrich and Medina M{\´e}ndez, Juan Ali and Schmidt, Heiko}, title = {Nutzbarmachung des elektrischen Windes zum verbesserten W{\"a}rme und Stofftransport im Elektroabscheider}, series = {ProcessNet 2020, Fachgruppe Gasreinigung}, journal = {ProcessNet 2020, Fachgruppe Gasreinigung}, pages = {1}, abstract = {Zur F{\"o}rderung einer nachhaltigeren Wertsch{\"o}pfungskette werden im Rahmen der Energiewende st{\"a}ndig neue Verfahren und Konzepte zu deren Umsetzung entwickelt. Eines dieser Konzepte befasst sich mit der Zusammenf{\"u}hrung bislang entkoppelter Prozessschritte in Gasreinigungssystemen aus der Energie- und Anlagentechnik. Aus den daraus resultierenden Einsparungen bei den Investitionskosten profitieren nicht nur die klassischen Energieerzeugeuer und Produktionsanlagen in der chemischen Industrie, sondern es werden auch neue Anreize zur dezentralen Energieeinspeisung von kleineren und mittelst{\"a}ndischen Unternehmen gesetzt. Elementarer Bestandteil dieser Gasreinigungssysteme sind h{\"a}ufig Elektroabscheider, welche weit verbreitet im Einsatz sind um Abgase von St{\"a}uben bzw. Aerosolen zu befreien, oder um staubf{\"o}rmige Wertprodukte aus Gasstr{\"o}mungen abzuscheiden. Die in Elektroabscheidern prinzipbedingt vorhandenen elektro¬¬hydro¬dyna¬mischen Str{\"o}mungen, auch als elektrischer Wind bezeichnet, sollen nun systematisch genutzt werden, um neben der Aerosolabscheidung gleichzeitig Aufgaben des W{\"a}rme- und Stoffaustauschs zu l{\"o}sen. Inhalte der Untersuchungen Zur Validierung der Machbarkeit dieser neuen Techniken wurde der Einfluss des elektrischen Windes auf die turbulente Quervermischung, anhand des verbesserten W{\"a}rme- und Stofftransports, sowie des Druckverlusts im Rohrelektroabscheider getestet. Bei den Untersuchungen wurden unterschiedliche Str{\"o}mungsgeschwindigkeiten, Elektrodengeometrien und Betriebsspannungen, sowie die Anwesenheit von Aerosol ber{\"u}cksichtigt. Ein Teil der Ergebnisse diente bereits als Validierungsgrundlage f{\"u}r numerische Simulationen mit einem neuartigen Turbulenzmodell [1]. [1] Medina, J., Schmidt, H., Riebel, U., Application of the one-dimensional turbulence model for electrohydrodynamic variable density flows, 17th European Turbulence Conference, 3-6 September 2019, Torino, Italy}, language = {de} } @misc{MedinaMendezBacherSchmidtetal., author = {Medina M{\´e}ndez, Juan Ali and Bacher, Christian and Schmidt, Heiko and Riebel, Ulrich}, title = {EHD-ODT: a stochastic turbulence model for the study of heat and mass transfer in wire-tube electrostatic precipitators}, series = {Jahrestreffen der ProcessNet-Fachgruppen Computational Fluid Dynamics und Gasreinigung}, journal = {Jahrestreffen der ProcessNet-Fachgruppen Computational Fluid Dynamics und Gasreinigung}, publisher = {DECHEMA e.V.}, pages = {2}, language = {en} } @misc{MedinaMendezSchmidt, author = {Medina M{\´e}ndez, Juan Ali and Schmidt, Heiko}, title = {The One-Dimensional Turbulence aspects of internal forced convective flows}, series = {14th World Congress on Computational Mechanics (WCCM XIV) ; 8th European Congress on Computational Methods in Applied Science and Engineering (ECCOMAS 2020)}, journal = {14th World Congress on Computational Mechanics (WCCM XIV) ; 8th European Congress on Computational Methods in Applied Science and Engineering (ECCOMAS 2020)}, address = {Paris, France}, pages = {1}, language = {en} } @misc{SchmidtMedinaMendezKlein, author = {Schmidt, Heiko and Medina M{\´e}ndez, Juan Ali and Klein, Marten}, title = {EHD turbulence in channel flows with inhomogeneous electrical fields: a one-dimensional turbulence study}, series = {14th World Congress on Computational Mechanics (WCCM) ; ECCOMAS Congress 2020, 19-24 July 2020, Paris, France}, journal = {14th World Congress on Computational Mechanics (WCCM) ; ECCOMAS Congress 2020, 19-24 July 2020, Paris, France}, doi = {10.23967/wccm-eccomas.2020.131}, pages = {12}, language = {en} } @phdthesis{MedinaMendez, author = {Medina M{\´e}ndez, Juan Ali}, title = {Application of the One-Dimensional Turbulence model to electrohydrodynamically enhanced internally forced convective flows}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-53388}, abstract = {This thesis is an attempt to assess some of the effects that electroquasistatic body forces exert on turbulent internally forced convective flows. In order to do that, a stochastic turbulence model is employed, namely, the One-Dimensional Turbulence (ODT) model. The reduced dimensionality of ODT demands a reduction of the Navier-Stokes equations (and in this case, also the Maxwell equations), into a 1-D system. This is done by performing an asymptotic analysis in terms of the nondimensional numbers of the flow. Also, a validation step due to the relative novel character of the cylindrical ODT formulation is done for an incompressible and constant properties flow regime and a variable density flow regime. The validation is presented for both the temporal (T-ODT) and a novel spatial (S-ODT) formulation in both planar and cylindrical geometries. Results in the constant property case show that wall normal (and radial) profiles, in both the T-ODT and S-ODT formulations, show good agreement with each other and to the data of Direct Numerical Simulations (DNSs). For the evaluated variable density heated pipe flow, gradients at the wall can be better reproduced with S-ODT. After validating the model, ODT is applied first into a planar configuration which emulates the flow in a wire-plate Electrostatic Precipitator (ESP). For this flow, the additional input energy due to the electroquasistatic body force has an effect on the modification of the bulk velocity, and subsequently, the skin friction coefficient. Some qualitative DNS trends are confirmed with ODT, such as the localized increase of the Reynolds stress, as a consequence of increased eddy activity close to the discharge electrodes. Next, the results of ODT simulations in a cylindrical wire-tube ESP are presented. Here, ODT results are compared to experimental results. ODT results for global integral quantities such as the streamwise pressure gradient and the Nusselt number enhancement ratio are able to match in a reasonable way the experimental results. The competing relevance between the EHD contribution to turbulence by momentum, and by affecting the temperature and density due to the Joule heating effect is also analyzed, showing the leading order relevance of the former one. Specifically for the Nusselt number results, the sensitivity of the EHD flow to transition effects is shown to be very significant. This thesis may open the door to a vast new field of phenomena which can not only serve for the further validation of the ODT model against DNSs or experiments, but also for the real use of ODT in applications which are so far inaccessible for traditional DNSs.}, language = {en} } @misc{MedinaMendezSchmidtBacheretal., author = {Medina M{\´e}ndez, Juan Ali and Schmidt, Heiko and Bacher, Christian and Riebel, Ulrich}, title = {Electrohydrodynamic-enhanced internal pipe flows from a One-Dimensional Turbulence perspective}, series = {91st Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM)}, volume = {20}, journal = {91st Annual Meeting of the International Association of Applied Mathematics and Mechanics (GAMM)}, number = {1}, publisher = {Wiley}, doi = {10.1002/pamm.202000132}, pages = {3}, language = {en} }