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International Journal of Rotating Machinery - Volume 7 2001, Issue 5, Pages 351-364

Department of Mechanical Engineering, Michigan State University, East Lansing, 48824-1226, Michigan, USA

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh 15213-3890, Pennsylvania, USA

Received 22 March 1999; Revised 15 June 2000

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Computations were performed to study the three-dimensional flow and heat transfer in a U-shaped duct of square cross section with inclined ribs on two opposite walls under rotating and non-rotating conditions. Two extreme limits in the Reynolds number 25,000 and 350,000 were investigated. The rotation numbers investigated are 0, 0.24, and 0.039. Results show rotation and the bend to reinforce secondary flows that align with it and to retard those that do not. Rotation was found to affect significantly the flow and heat transfer in the bend even at a very high Reynolds number of 350,000 and a very low Rotation number of 0:039. When there is no rotation, the flow and heat transfer in the bend were dominated by rib-induced secondary flows at the high Reynolds number limit and by bend-induced pressure-gradients at the low Reynolds number limit. Long streaks of reduced surface heat transfer occur in the bend at locations where streamlines from two contiguous secondary flows merge and then flow away from the surface. The location and size of these streaks varied markedly with Reynolds and rotation numbers.

This computational study is based on the ensemble-averaged conservation equations of mass, momentum compressible Navier-Stokes, and energy. Turbulence is modelled by the low-Reynolds shear-stress transport SST model of Menter. Solutions were generated by using a cell-centered, finite-volume method, that is based on second-order accurate flux-difference splitting and a diagonalized alternating-direction implicit scheme with local time-stepping and V-cycle multigrid.

Autor: Tom I.-P. Shih, Yu-Liang Lin, and Mark A. Stephens

Fuente: https://www.hindawi.com/


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