RESEARCH PAPERS: Forced Convection

Visualization of Flow Phenomena Near Enhanced Surfaces

[+] Author and Article Information
T. S. Ravigururajan

Department of Mechanical Engineering, The Wichita State University, Wichita, KS 67260

A. E. Bergles

Department of Mechanical Engineering, Aeronautical Engineering & Mechanics, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Heat Transfer 116(1), 54-57 (Feb 01, 1994) (4 pages) doi:10.1115/1.2910883 History: Received September 01, 1991; Revised June 01, 1993; Online May 23, 2008


Passive augmentation techniques such as surface disruptions are being increasingly used in heat exchangers. Although many working correlations have been suggested to predict their thermal-hydraulic characteristics, the physical phenomena governing the heat transfer enhancement have not been clearly understood. The paper describes a qualitative study on the flow phenomena near an enchanced surface. Water was used as the working fluid. Experiments were conducted for different coil wire diameters and for a Reynolds number of 150-2600. The results show the simultaneous existence of different flow patterns in enhanced flow. Also, the study confirmed that the developing length is very much smaller than that of a smooth tube, even for laminar flow.

Copyright © 1994 by The American Society of Mechanical Engineers
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