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首页> 外文会议>HTD-vol.376-2; ASME(American Society of Mechanical Engineers) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >ULTRAFAST LASER RADIATION AND CONDUCTION HEAT TRANSFER IN BIOLOGICAL TISSUES
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ULTRAFAST LASER RADIATION AND CONDUCTION HEAT TRANSFER IN BIOLOGICAL TISSUES

机译：生物组织中的超快激光辐射和传导热传递

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摘要

Ultrafast laser radiation heat transfer in biological tissues is governed by time-dependent equation of radiative transfer and modeled using the transient discrete ordinates method. The divergence of radiative heat flux is then obtained and used for predicting the local temperature response due to radiation energy absorption within the ultrashort time period. To this end, the lumped method is employed and heat diffusion is negligible. Both single pulse and pulse train irradiations are considered. For the single pulse irradiation, the transient radiation field is obtained and the local temperature keeps rising until a time of about 20 times of the short pulse width; and then a stable local temperature profile is reached and maintained until the start of heat conduction. For the pulse train case (10~4 ultrashort pulses until 1 ms), the local temperature response is an accumulation of continuous single pulses because the thermal relaxation time of biological tissues was reported in the range of 1-100 sec and is much longer than the pulse train duration (1 ms). After a stable local temperature field is achieved, the hyperbolic heat conduction model is adopted to describe the heat conduction. MacCormark's scheme is utilized for solving the thermal wave equations. Thermal wave behavior is observed during the heat transfer process. It is found that the hyperbolic wave model predicts a higher temperature rise than the classical heat diffusion model. After several thermal relaxation times the thermal wave behavior is substantially weakened and the predictions between the hyperbolic and diffusion models match.
机译：生物组织中超快激光辐射的热传递受时间相关的辐射传递方程控制，并使用瞬态离散纵坐标方法进行建模。然后获得辐射热通量的发散，并用于预测由于在超短时间内吸收辐射能量而引起的局部温度响应。为此，采用集总方法，并且热扩散可以忽略不计。同时考虑了单脉冲和脉冲串照射。对于单脉冲辐照，获得了瞬态辐射场，并且局部温度持续升高，直到达到短脉冲宽度的20倍为止。然后达到并维持稳定的局部温度曲线，直到开始热传导。对于脉冲序列的情况（直到1 ms为10〜4个超短脉冲），局部温度响应是连续单个脉冲的累积，因为据报道生物组织的热弛豫时间在1-100秒的范围内，并且比脉冲序列持续时间（1毫秒）。在达到稳定的局部温度场后，采用双曲线导热模型来描述导热。 MacCormark的方案用于求解热波方程。在传热过程中观察到热波行为。发现双曲线波模型比经典的热扩散模型预测更高的温度上升。经过数次热弛豫时间后，热波行为将大大减弱，双曲线模型和扩散模型之间的预测会匹配。

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