Abstract
Present paper is partly a declaration of state of a currently ongoing PhD work about turbulent flow in a thick walled pipe in order to analyze conjugate heat transfer. An ongoing effort on CFD investigation of this problem using cylindrical coordinates and dimensionless governing equations is identified alongside a literature review. The mentioned PhD work will be conducted using an in-house developed code. However it needs preliminary evaluation by means of commercial codes available in the field. Accordingly ANSYS CFD was utilized in order to evaluate mesh structure needs and asses the turbulence models and solution options in terms of computational power versus difference signification. Present work contains a literature survey, an arrangement of governing equations of the PhD work, CFD essentials of the preliminary analysis and findings about the mesh structure and solution options. Mesh element number was changed between 5,000 and 320,000. k-ϵ, k-ω, Spalart-Allmaras and Viscous-Laminar models were compared. Reynolds number was changed between 1,000 and 50,000. As it may be expected due to the literature, k-ϵ yields more favorable results near the pipe axis and k-ωyields more convenient results near the wall. However k-ϵ is found sufficient to give turbulent structures for a conjugate heat transfer problem in a thick walled plain pipe.
Highlights
Flow inside a thick walled pipe and related heat transfer is of interest
Numerical and computational means can be used for investing a wide range of mentioned interest and compact results can be reported in a way that the results can be converted and applied to a wide application variety and field
A dedicated team in Turkey has been performing numerical studies on unsteady and steady conjugate heat transfer related to thick walled pipes under various conditions such as periodic boundary conditions, simultaneously developing flow, rarefaction effects and slippery flow, heat transfer in tangential direction and etc by using cylindrical coordinates and their own developed codes
Summary
Flow inside a thick walled pipe and related heat transfer is of interest. Numerical and computational means can be used for investing a wide range of mentioned interest and compact results can be reported in a way that the results can be converted and applied to a wide application variety and field. The compact results can be derived by scaling and using dimensionless governing equations. A dedicated team in Turkey has been performing numerical studies on unsteady and steady conjugate heat transfer related to thick walled pipes under various conditions such as periodic boundary conditions, simultaneously developing flow, rarefaction effects and slippery flow, heat transfer in tangential direction and etc by using cylindrical coordinates and their own developed codes. The results are dimensionless and can be expanded for certain magnitudes. Remarkable developments and major events are summarized below according to the publishing timeline
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