Journal ArticleDOI
A New Simplified Bioheat Equation for the Effect of Blood Flow on Local Average Tissue Temperature
Sheldon Weinbaum,Latif M. Jiji +1 more
TLDR
A new simplified three-dimensional bioheat equation is derived to describe the effect of blood flow on blood-tissue heat transfer and shows that the vascularization of tissue causes it to behave as an anisotropic heat transfer medium.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-micron diameter. The new bioheat equation also describes this mechanism.read more
Citations
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Journal ArticleDOI
Lagging heat models in thermodynamics and bioheat transfer: a critical review
TL;DR: In this article , the authors focus on the dual-phase-lag (DPL) approach for modeling non-Fourier heat conduction, which is a modification of Fourier's law.
Journal ArticleDOI
Magnetic resonance temperature imaging-based quantification of blood flow-related energy losses
TL;DR: A new approach for evaluating bioheat transfer equation (BHTE) models used in treatment planning, control and evaluation of all thermal therapies holds promise for improving understanding of thermal therapy biophysics and for evaluating biothermal models.
Journal ArticleDOI
Airway thermal volume in humans and its relation to body size
Vladimir B. Serikov,E. Heidi Jerome,Neal Fleming,Peter G. Moore,Frederick A. Stawitcke,Norman C. Staub +5 more
TL;DR: The objective of this study was to investigate the influence of volume ventilation (VE) and cardiac output (Q) on the temperature of the expired gas at the distal end of the endotracheal tube in anesthetized humans.
Book ChapterDOI
Analytical Solutions to 3-D Bioheat Transfer Problems with or without Phase Change
Zhong-Shan Deng,Jing Liu +1 more
TL;DR: The theoretical strategies towards exactly solving the three-dimensional (3-D) bioheat transfer problems for both cases with and without phase change were systematically illustrated based on the authors’ previous works.
Journal ArticleDOI
Thermal sensitivity in humans at the depth of thermal receptor endings beneath the skin: validation of a heat transfer model of the skin using high-temporal resolution stimuli
TL;DR: Findings indicate that heat transfer models provide good estimates of temperatures at the thermal receptors, and use of these models may facilitate comparisons among studies using different stimulation devices and may facilitate the establishment of standards involving all stimulation parameters.