TED-AJ03-647 A STUDY OF THE RELATIONSHIP BETWEEN FLOW RATE AND TEMPERATURE IN PERIPHERAL ARTERIES BY A ONE-DIMENSIONAL ELASTIC TUBE MODEL
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概要
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The blood flow plays an important role on heat transfer in living tissue, especially, the flow rates in peripheral arteries of the hand are closely related to the fingertip temperature. The study of haemodynamic effects on temperature may help us to know the mechanism of thermoregulation and some circulation diseases (such as Raynaud's syndrome). We have developed a one-dimensional elastic tube model for the blood flow and temperature in the peripheral arteries. The model is based on the one-dimensional flow equations (the continuity, momentum, and state equations) and energy equation. The energy equation for the elastic tube is derived basing on Keller and Seiler's model (3). Different from the energy equation for a rigid tube, The cross-sectional area of the blood vessel changes with time and space. Firstly, the model is applied to describe the flow in a single vessel and a simple bifurcation. The two-step Lax-Wendroff method is employed in the discretization of momentum and continuity equation. The upwind scheme is used in the discretization of the energy equation. After the flow rate and the cross-sectional area of the vessel are computed, they are inserted into the energy equation, the arterial temperature is thus obtained. The blood vessel is assumed to taper exponentially. The inflow is assumed in a form of physiological volumetric flow rate. The outflow boundary condition is assumed to determine by a pure resistive load. The blood flow rate, transmural pressure, and blood temperature at different inflow conditions are computed. The results show that the pulsating axial flow rate produces a pulsating temperature. Moreover, the arterial temperature response follows closely the changes in flow rate. This implies that the temperature of the peripheral vessel may significantly depend on the variation of the flow rate. Further research is necessary in building up the model of the whole human systemic circulation. Meanwhile, the coupling of the model with the thermal model of solid tissue is expected. It is hoped that this model is applicable to the medical diagnosis.[figure]
- 一般社団法人日本機械学会の論文
著者
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Himeno Ryutaro
Computer And Information Division The Institute Of Physical And Chemical Research
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He Ying
Computer And Information Division The Institute Of Physical And Chemical Research
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LIU Hao
Computer and Information Division, The Institute of Physical and Chemical Research
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Liu Hao
Computer And Information Division The Institute Of Physical And Chemical Research (riken)
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Himeno Ryutaro
Computational Biomechanics Unit Riken
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Liu Hao
Computer And Information Division The Institute Of Physical And Chemical Research
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