每年出版 18 期
ISSN 打印: 1064-2285
ISSN 在线: 2162-6561
Indexed in
NUMERICAL INVESTIGATION OF FLUID FLOW AND HEAT TRANSFER IN A C-SHAPED GEOMETRY OF RECTANGULAR CROSS SECTION
摘要
Three-dimensional simulations are carried out to investigate heat transfer and fluid flow characteristics of a chaotic geometry using a computational fluid dynamics (CFD) soft ware. Heat transfer and pressure drop are investigated for Reynolds numbers ranging from 50 to 1500. The model geometry is created and meshed using the Gambit soft ware. Preliminary simulations using a laminar flow model are carried out to identify the transition Reynolds number. Fluid flow and heat transfer are simulated and the results were compared using both laminar and turbulent flow models (standard k–ε model). Steady-state solvers are adopted to calculate pressure drop, flow and temperature fields. Model validation is carried out by comparing the simulation results for Nusselt and Poiseuille numbers against data from the literature. The simulations clearly highlighted the contribution of secondary flows (vortices) to the enhancement of heat transfer compared to a straight pipe, as well as the earlier occurrence of a transitional flow regime. The increase in the pressure drop remains the main drawback of the chaotic geometries. This disadvantage is avoidable through an optimization of the geometrical arrangement and an adequate choice of the operating conditions.