%0 Journal Article
%T Numerical Investigation of Turbulence Models for Separation Fluid Flow in an Annular Passage in Regenerative Pipe
%J American Journal of Oil and Chemical Technologies
%I Petrotex Library
%Z 2326-6570
%A Sadri, Abbas
%A Kazemi, Mohsen
%A Hosseini, Yousef
%A Fathi, Roohalah
%D 2015
%\ 10/01/2015
%V 3
%N 4
%P 243-250
%! Numerical Investigation of Turbulence Models for Separation Fluid Flow in an Annular Passage in Regenerative Pipe
%K reattachment
%K annular passage
%K recirculation
%K sudden expansion
%K Regenerative Pipe
%R
%X Separation and reattachment of airflow through a sudden expansion in an annular passage withuniform heat after step are considered in this paper. The annular passage with step is applied in thedesign of many heat related applications where heat transfer is concerned. In this work, numericalsimulation for many turbulence models is performed using computer fluid dynamics package(commercial software) to study the effect of step flow in an annular passage. The numerical results arecompared with the preliminary experimental data. The annular passage, the flowing fluid wasconsidered when heated uniformly from the beginning of the expansion. Constant heat flux approachwas also considered for the heat transfer investigation. Annular pipe flow system having Reynoldsnumber of 17,050 and uniform heat flux equal to 2098 W/m2 and a step ratio of D/d=1.8 wasconsidered where d and D were representing the diameter of the pipe before and after expansion.Numerical simulation review shows that the reattachment point extends further with the increase ofvelocity for different occasions. Finally, experimental results for surface temperature (Ts) and localHeat transfer (h) are compared with CFD results after expansion for many turbulence models
%U