TED-AJ03-166 A FINITE ELEMENT MODEL FOR DETERMINING THE EFFECTS OF BLOOD FLOW ON THE FINGER TEMPERATURE DISTRIBUTION

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概要

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• It has been known that the finger skin temperature is closely related to total digital blood flow. For example, after cigarette smoking, the peripheral circulation becomes worse and the skin temperature decreases. When people are in the state of stress, the finger skin temperature will decrease for the vasoconstriction of finger arterioles. On the other hand, while warming distant torso body areas, the blood circulation to the fingers will be augmented and the fingers will be at comfortable temperatures during cold exposure. Several models concerned with the thermal behavior of one part of human body have been developed (e.g. Yokoyama et al. (16); Ling et al. (10); Sihtzer et al. (15)). All these models have their characteristics in considering the effects of blood vessels. However, some aspects such as the effect of blood flow rate on the finger temperature, need to be further investigated. A two-dimensional finite element thermo-fluid model is presented to investigate the effect of blood flow on the temperature distribution of a finger. The finger consists of the countercurrent major arterial and venous blood vessels, bone, tendon, and skin. Since it is not easy to model the arrangement of the blood vessels, two structures are employed in modeling the blood flow path (fig. A-1). The basic Navier-Stokes equations and energy equation are used to express the flow inside the blood vessels. The heat transport inside the solid tissues is expressed by Pennes bioheat equation. Galerkin finite element technique is used in the discretization of the governing equations. The blood pressure and velocity are solved by the fractional step method. The temperatures within blood vessels and tissues are solved explicitly. The temperature distributions at different blood velocities are obtained. The simulated results show that the finger skin temperature increases with increasing the blood velocity, although it gives much less variability than the blood velocity. The computed temperatures are compared to the measured values.[figure]

• 一般社団法人日本機械学会の論文

著者

• Himeno Ryutaro

  Computer And Information Division The Institute Of Physical And Chemical Research

• He Ying

  Computer And Information Division The Institute Of Physical And Chemical Research

• SHIRAZAKI Minoru

  Computer and Information Division, The Institute of Physical and Chemical Research

• Himeno Ryutaro

  Computational Biomechanics Unit Riken

• Shirazaki Minoru

  Computer And Information Division The Institute Of Physical And Chemical Research

• He Ying

  Computer and Information Division, The Institute of Physical and Chemical Research

関連論文

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• TED-AJ03-166 A FINITE ELEMENT MODEL FOR DETERMINING THE EFFECTS OF BLOOD FLOW ON THE FINGER TEMPERATURE DISTRIBUTION
• Two Dimensional FEM Model to Investigate the Effect of Distal Blood Flow on the Human Finger
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