@phdthesis{Koenig2015, author = {K{\"o}nig, Franziska}, title = {Investigation of high Reynolds number pipe flow - CoLaPipe experiments}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-35392}, school = {BTU Cottbus - Senftenberg}, year = {2015}, abstract = {Investigations of high Reynolds number pipe flow is up to now a great challenge due to the complex mechanisms which appear in pipe flow turbulence. Hence, suitable experimental facilities are necessary to resolve turbulent dynamics and therewith to provide the knowledge for the understanding of such a simple shear flow. For this reason the recent thesis deals with conceptual design and setup of a new high Reynolds number pipe test facility further on named CoLaPipe - Cottbus Large Pipe. It also comprises first investigations on pipe flow obtained from the new CoLaPipe, which can be classified into 1.)calibration measurements to put the facility into service and 2.)continuative measurements to provide experimental results helping to understand pipe flow. The first results within the CoLaPipe show that this new experimental facility is suitable to investigate turbulence at high Reynolds numbers, where this conclusion can be drawn from intensive investigations on the development length of the flow either for natural and artificial transition. From further experiments on the evaluation of the wall friction velocity using different estimation methods great difficulties and variations in the calculated values are obtained. These deviations are directly related to the scaling behavior of the mean and fluctuating velocity, which is also shown within this thesis and intensively discussed. Among the discussion of the setup of the new CoLaPipe and the first experimental results this thesis contains a broad literature review with the focus on high and very high Reynolds numbers. Nevertheless, pipe flow at low and moderate Reynolds numbers is described as well.}, subject = {Turbulence; Pipe flow; High Reynolds number; Wind tunnel; Fluid dynamics; Turbulenz; Rohrstr{\"o}mung; Hohe Reynoldszahlen; Windkanal; Str{\"o}mungsmechanik; Windkanal; Rohrstr{\"o}mung; Turbulente Str{\"o}mung; Reynolds-Zahl}, language = {en} }