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Flow over a system of several ribs under conditions of high free-stream turbulence

Flow over a system of several ribs under conditions of high free-stream turbulence Results of an experimental hydrodynamic and heat-transfer study of the turbulent separated flow developing over a system of several cross-flow ribs are reported. Conditions with low and high free-stream turbulence are considered. Visualization and heat-transfer data are presented, and a comparison for two turbulence levels is given. In the system of three or more ribs, a very unstable flow in the second inter-rib cell was observed under low-turbulence conditions. Under a high level of free-stream turbulence, the flow in the first inter-rib cell is unstable; this observation is supported by measured pressure distributions. Addition of each next rib makes the separation flow region behind the last rib and the pressure recovery region less extended, and decreases the coordinate at which the rate of heat transfer attains its maximum. In the high-turbulent flow, the heat-transfer intensification in the second inter-rib cell amounts to 30 %. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Thermophysics and Aeromechanics Springer Journals

Flow over a system of several ribs under conditions of high free-stream turbulence

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Publisher
Springer Journals
Copyright
Copyright © V.I. Terekhov, N.I. Yarygina, and Ya.I. Smul’sky 2006
ISSN
0869-8643
eISSN
1531-8699
DOI
10.1134/s0869864306030036
Publisher site
See Article on Publisher Site

Abstract

Results of an experimental hydrodynamic and heat-transfer study of the turbulent separated flow developing over a system of several cross-flow ribs are reported. Conditions with low and high free-stream turbulence are considered. Visualization and heat-transfer data are presented, and a comparison for two turbulence levels is given. In the system of three or more ribs, a very unstable flow in the second inter-rib cell was observed under low-turbulence conditions. Under a high level of free-stream turbulence, the flow in the first inter-rib cell is unstable; this observation is supported by measured pressure distributions. Addition of each next rib makes the separation flow region behind the last rib and the pressure recovery region less extended, and decreases the coordinate at which the rate of heat transfer attains its maximum. In the high-turbulent flow, the heat-transfer intensification in the second inter-rib cell amounts to 30 %.

Journal

Thermophysics and AeromechanicsSpringer Journals

Published: Sep 1, 2006

Keywords: Heat Transfer; Pressure Coefficient; Separate Flow; Turbulence Level; Intensify Heat Transfer

References