THEORETICAL MODELING OF PERIPHERAL TISSUE AND WHOLE LIMB HEAT-TRANSFER.
Item
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Title
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THEORETICAL MODELING OF PERIPHERAL TISSUE AND WHOLE LIMB HEAT-TRANSFER.
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Identifier
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AAI8713800
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identifier
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8713800
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Creator
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SONG, WEI JIE.
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Contributor
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Sheldon Weinbaum
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Date
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1987
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Mechanical
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Abstract
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In the first part of this dissertation the new bioheat equation derived in Weinbaum and Jiji 10 is applied to a three layer conceptual model of microvascular surface tissue organization. A simplified one-dimensional quantitative model of peripheral tissue energy exchange is then developed. A representative vasculature is constructed for each layer and the enhancement in the local tensor conductivity of the tissue as a function of vascular geometry and blood flow is examined. Numerical solutions for the boundary value problem coupling the three layers are presented and these results used to study the thermal behavior of peripheral tissue for a wide variety of physiological conditions from supine resting state to maximum exercise.;In the second part a new basic model for whole limb heat transfer is proposed wherein the countercurrent heat from the large central artery and vein is coupled to the microvascular heat exchange in the surrounding muscle tissue and the outer cutaneous layer by matching the far field conduction solution from the central vessels to the local microvascular temperature field in the muscle tissue described by the new bioheat equation of Weinbaum and Jiji. This fundamental coupling shows how large primarily unequilibrated vessels can be integrated within the temperature field of a perfused tissue whose thermally significant microvessels are close to equilibrium with the local mean tissue temperature. The new model allows for an arbitrary axial variation of cross-sectional area and blood distribution between the muscle and cutaneous tissue, includes the heat transfer at the skin surface, accounts for the blood flow to and heat loss from the extremity and treats the venous return temperature and surface temperature distribution as unknowns that are determined as part of the solution to the overall boundary value problem. Representative solutions are also presented for a wide range of environmental conditions for the limb in both the resting state and during exercise.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Engineering
