Technical Briefs

Thermal Wave Applications in Flow Fields With Steady Velocity Profile

[+] Author and Article Information
Zhefu Wang

Department of Mechanical Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331zhefu_wang@amat.com

Richard B. Peterson

Department of Mechanical Engineering, Oregon State University, 204 Rogers Hall, Corvallis, OR 97331richard.peterson@oregonstate.edu

J. Heat Transfer 132(5), 054501 (Mar 05, 2010) (4 pages) doi:10.1115/1.3194758 History: Received May 22, 2008; Revised June 06, 2009; Published March 05, 2010; Online March 05, 2010

This study explores the use of a thermal wave approach for flow field measurement applications, such as flow diagnostics near surfaces and in microfluidic systems. The basic mathematical characteristics of the governing equations of heat convection, with periodic heating boundary conditions in steady flow, are discussed and the validity of applying the complex combination method to this problem is illustrated. A scaling analysis of a two-dimensional thermal wave configuration with a linear velocity profile is performed to provide important insights into this type of heat transfer phenomena. A two-dimensional conjugate heat transfer model is developed and solved numerically with a finite difference method to demonstrate an example of imposing a thermal wave onto a flow field. The simulation results show that the temperature signal, especially the phase information, can be used for the measurement of flow properties near the surface, such as the wall shear stress.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

Schematic of scaling analysis

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Figure 2

Schematic of wall shear stress measurement design: (a) computation domain and (b) sensor design schematic

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Figure 3

Temperature magnitude (right) and phase shift (left) versus velocity gradient




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