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首页> 外文期刊>Journal of Heat Transfer >Theoretical and Experimental Study of a Flexible Wiretype Joule-Thomson Microrefrigerator for Use in Cryosurgery
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Theoretical and Experimental Study of a Flexible Wiretype Joule-Thomson Microrefrigerator for Use in Cryosurgery

机译：用于冷冻手术的柔性线型焦耳-汤姆森微制冷机的理论和实验研究

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摘要

We have developed a model capable of predicting the performance characteristics of a wiretype Joule—Thomson microcooler intended for use within a cryosurgical probe. Our objective was to be able to predict cold tip temperature, temperature distribution, and cooling power using only inlet gas properties as input variables. To achieve this, the model incorporated gas equations of state to account for changing gas properties due to heat transfer within the heat exchanger and expansion within the capillary. In consideration of inefficiencies, heat in-leak from free convection and radiation was also considered and the use of a 2D axisymmetric finite difference code allowed simulation of axial conduction. To validate simulation results, we have constructed and conducted experiments with two txpes of microcoolers differing in inner tube material, poly-ether-ether-ketone (PEEK) and stainless steel. The parameters of the experiment were used in the calculations. CO_2 was used as the coolant gas for inlet pressures from 0.5 MPa to 2.0 MPa. Heat load trials of up to 550 mW along with unloaded trials were conducted. The temperature measurements show that the model was successfully able to predict the cold tip temperature to a good degree of accuracy and well represent the temperature distribution. For the all PEEK microcooler in a vacuum using 2.0 MPa inlet pressure, the calculations predicted a temperature drop of 57 K and mass flow rate of 19.5 mgls compared to measured values of 63 K and 19.4 mgls, therefore, showing that conventional macroscale correlations can hold well for turbulent microscale flow and heat transfer as long as the validity of the assumptions is verified.
机译：我们已经开发了一种模型，该模型能够预测用于冷冻外科探针的线型焦耳-汤姆森微冷却器的性能特征。我们的目标是仅使用进气特性作为输入变量就能预测冷端温度，温度分布和冷却功率。为了达到这个目的，该模型结合了气体状态方程，以解释由于热交换器内的热传递和毛细管内的膨胀而引起的气体特性变化。考虑到效率低下，还考虑了自由对流和辐射的热泄漏，并且使用二维轴对称有限差分代码可以模拟轴向传导。为了验证仿真结果，我们用两种不同内管材料，聚醚醚酮（PEEK）和不锈钢制成的微型冷却器构造并进行了实验。计算中使用了实验参数。将CO_2用作进气压力为0.5 MPa至2.0 MPa的冷却剂气体。进行了高达550 mW的热负荷试验以及空载试验。温度测量表明，该模型能够成功地以良好的精度预测冷端温度，并很好地代表了温度分布。对于使用2.0 MPa入口压力的真空中的所有PEEK微型冷却器，计算结果预测，与63 K和19.4 mgls的测量值相比，温度下降57 K，质量流量为19.5 mgls，因此，表明常规的宏观相关性可以成立只要能验证假设的有效性，就可以很好地应对湍流的微尺度流动和传热。

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  • 来源
    《Journal of Heat Transfer》 |2012年第2期|p.020903.1-020903.7|共7页
  • 作者

    Adhika Widyaparaga; Masashi Kuwamoto; Naoya Sakoda; Masamichi Kohno; Yasuyuki Takata;

  • 作者单位

    Department of Mechanical Engineering,Kyushu University,744 Motooka, Nishi-ku,Fukuoka 819-0395,Japan Department of Mechanical and Industrial Engineering,Gadjah Mada University,Jl. Grafika 2, Yogyakarta 55281, Indonesia;

    Department of Mechanical Engineering,Kyushu University,744 Motooka, Nishi-ku,Fukuoka 819-0395,Japan;

    International Research Center for Hydrogen Energy,Kyushu University,744 Motooka, Nishi-ku,Fukuoka 819-0395, Japan;

    Department of Mechanical Engineering International Institute for Carbon-Neutral Energy Research,Kyushu University,744 Motooka, Nishi-ku,Fukuoka 819-0395,Japan;

    Department of Mechanical Engineering International Institute for Carbon-Neutral Energy Research,Kyushu University,744 Motooka, Nishi-ku,Fukuoka 819-0395,Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    joule-thomson microcooler; microchannel; cryoprobe; performance predic-tion; simulation;

    机译：焦耳-汤姆森微冷却器;微通道冷冻探头性能预测;模拟;

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