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%0 Thesis
%A Akermann, Kevin
%T Large-eddy simulation of turbulent heat transfer and particle deposition in helically ribbed pipes
%I RWTH Aachen University
%V Dissertation
%C Düren
%M RWTH-2023-08098
%P 1 Online-Ressource : Illustrationen, Diagramme
%D 2023
%Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
%Z Dissertation, RWTH Aachen University, 2023
%X Structured surfaces on the inner pipe wall affect not only the heat transfer and pressure loss, but also the susceptibility of the pipe to solid deposit. Although accumulations of solids on heat transfer surfaces are a major concern during the operation of heat exchangers, new, further enhanced roughened pipes are mostly developed with regard to heat transfer and pressure loss, neglecting particle deposition. In order to provide successful countermeasures against fouling, it is necessary to obtain more information on particle deposition on structured pipe walls. Results of detailed numerical multiphase simulations can be used to support the development process of internally structured pipes in terms of solid deposit. Therefore, several differently shaped helically rib-roughened pipes are numerically investigated in the present work with regard to heat transfer, to pressure loss, and to their susceptibility to solid deposit. Large-eddy simulations of the flow through structured pipes have been performed and the results of the fluid statistics, heat transfers, and particle statistics are presented in detail. It is shown that the geometrical structure of the wall significantly affects the physics of the fluid flow and the solid particle transport. The results further show that the choice of certain geometrical parameters can help to mitigate particulate fouling.
%F PUB:(DE-HGF)11
%9 Dissertation / PhD Thesis
%R 10.18154/RWTH-2023-08098
%U https://publications.rwth-aachen.de/record/964016