Pulsatile blood flow effects on temperature distribution and heat transfer in rigid vessels
Pulsatile blood flow effects on temperature distribution and heat transfer in rigid vessels
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DOI：
10.1115/1.1392318
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发表时间：
2001-10-01
影响因子：
1.7
通讯作者：
Clegg, ST
中科院分区：
文献类型：
--
作者：
Craciunescu, OI;Clegg, ST
研究了血速脉动对生物热传递的影响。考虑具有不稳定周期性流动的直刚性血管的简单模型。模拟中使用了考虑完全耦合的纳维-斯托克斯方程和能量方程的数值解。研究了四种典型血管尺寸的脉动率对温度分布和能量传输的影响：主动脉、大动脉、终末动脉分支和小动脉。结果表明：脉动轴向速度产生脉动温度分布：在主动脉和大血管中发生逆转（流动，这在温度分布中产生显着的时间变化。脉动率的变化导致大血管的血管壁和流体之间的能量传输发生变化。对于热重要的终末动脉（0.04-1 mm），速度脉动对温度分布和从血管中的能量传输影响很小（8%鉴于脉动血流速度导致的时间平均不稳定热通量与假设的非脉动血流速度之间存在微小差异，为了估计生物热传递，假设非脉动血流速度是合理的。
The effect of blood velocity pulsations on bioheat transfer is studied. A simple model of a straight rigid blood vessel with unsteady periodic flow is considered. A numerical solution that considers the fully coupled Navier-Stokes and energy equations is used for the simulations. The influence of the pulsation rate on the temperature distribution and energy transport is studied for four typical vessel sizes: aorta, large arteries, terminal arterial branches, and arterioles. The results show that: the pulsating axial velocity produces a pulsating temperature distribution: reversal ( flow occurs in the aorta and in large vessels, which produces significant time variation in the temperature profile. Change of the pulsation rate yields a change of the energy transport between the vessel wall and fluid for the large vessels. For the thermally important terminal arteries (0.04-1 mm), velocity pulsations have a small influence on temperature distribution and on the energy transport out of the vessels (8 percent for the Womersley number corresponding to a normal heart rate). Given that there is a small difference between the time-averaged unsteady heat flux due to a pulsating blood velocity, and an assumed nonpulsating blood velocity, it is reasonable to assume a nonpulsating blood velocity for the purposes of estimating bioheat transfer