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RESEARCH PAPERS

Comparison of Flying-Hot-Wire and Stationary-Hot-Wire Measurements of Flow Over a Backward-Facing Step

[+] Author and Article Information
O. O. Badran

Al-Balgá Applied University, Amman College, Department of Mechanical Engineering, Amman 11133, Jordan

H. H. Bruun

Department of Mechanical and Medical Engineering, University of Bradford, Bradford, BD7 1DP, United Kingdom

J. Fluids Eng 121(2), 441-445 (Jun 01, 1999) (5 pages) doi:10.1115/1.2822229 History: Received May 16, 1997; Revised January 05, 1999; Online January 22, 2008

Abstract

This paper is concerned with measurements of the flow field in the separated flow region behind a backward-facing step. The main instrument used in this research was Flying X Hot-Wire Anemometry (FHWA). Stationary (single normal) Hot-Wire Anemometry (SHWA) was also used. Comparative measurements between the SHW probe and the FHW system were conducted downstream of the step (step height H = 120 mm) and results are presented for axial locations of 1H and 2H. Two step configurations were considered; (i) a blunt leading edge with flow underneath (Case I) and (ii) a blunt leading edge with no flow underneath (Case II). It is observed from the results presented that the two Hot-Wire methods produce significantly different mean velocity and turbulence results inside the separation bubble. In particular, the SHWA method cannot detect the reverse flow velocity direction, while the Flying Hot-Wire clearly identifies the existing reverse flow. Also, in the shear flow region, the results presented indicate that measurements with a SHW probe must be treated with great caution.

Copyright © 1999 by The American Society of Mechanical Engineers
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