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RESEARCH PAPERS

A New Simplified Bioheat Equation for the Effect of Blood Flow on Local Average Tissue Temperature

[+] Author and Article Information
S. Weinbaum, L. M. Jiji

Department of Mechanical Engineering, The City College of The City University of New York, New York, N.Y. 10031

J Biomech Eng 107(2), 131-139 (May 01, 1985) (9 pages) doi:10.1115/1.3138533 History: Received May 01, 1984; Revised January 21, 1985; Online June 15, 2009

Abstract

A new simplified three-dimensional bioheat equation is derived to describe the effect of blood flow on blood-tissue heat transfer. In two recent theoretical and experimental studies [1, 2] the authors have demonstrated that the so-called isotropic blood perfusion term in the existing bioheat equation is negligible because of the microvascular organization, and that the primary mechanism for blood-tissue energy exchange is incomplete countercurrent exchange in the thermally significant microvessels. The new theory to describe this basic mechanism shows that the vascularization of tissue causes it to behave as an anisotropic heat transfer medium. A remarkably simple expression is derived for the tensor conductivity of the tissue as a function of the local vascular geometry and flow velocity in the thermally significant countercurrent vessels. It is also shown that directed as opposed to isotropic blood perfusion between the countercurrent vessels can have a significant influence on heat transfer in regions where the countercurrent vessels are under 70-μm diameter. The new bioheat equation also describes this mechanism.

Copyright © 1985 by ASME
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