Title: Turbulent flow and heat transfer in a square-sectioned U-bend

Authors: S. Etemad, B. Sunden, O. Daunius

Addresses: Thermodynamic Analysis, Dept. 97613 HC2S, Volvo Car Corporation, SE 405 31 Gothenburg, Sweden. ' Division of Heat Transfer, Lund Institute of Technology, P.O. Box 118, SE 221 00 Lund, Sweden. ' Thermodynamic Analysis, Dept. 97613 HC2S, Volvo Car Corporation, SE 405 31 Gothenburg, Sweden

Abstract: Turbulent flow and heat transfer in a square-sectioned U-bend are investigated. Turbulence models with linear and non-linear expressions for the Reynolds stresses are used. The near wall turbulence is treated by the damping functions approach and a two-layer model with Wolfshtein|s sub-layer treatment. The inlet conditions have a significant effect on the predictions. The results from the non-linear low-Reynolds number k-ε models including Suga|s cubic low-Re model were closest to experimental data. These models predicted the stress-induced secondary motion in the straight inlet duct well. This secondary motion had a small impact on the flow in the bend.

Keywords: curved duct; heat transfer; computation; turbulence models; secondary flow; CFD; computational fluid dynamics; turbulent flows.

DOI: 10.1504/PCFD.2006.009486

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.1/2/3, pp.89 - 100

Published online: 05 Apr 2006 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article