| 摘要: |
| 通过实验测定了不同氮气预冷温度、热负荷条件下冷冻消融探针内J-T节流制冷器温度与流量。实验结果表明：冷冻消融探针工作温度随氮气预冷温度变化而变化，热负荷越大所需氮气预冷温度越低；氮气预冷温度过低会造成制冷量浪费与回热换热器换热效率降低；氮气流量随高压氮气出口温度的降低而增大，除临界区域外氮气计算流量符合测试结果。 |
| 关键词: 热工学 节流制冷器 冷冻消融探针 冷冻消融 |
| DOI： |
| 投稿时间：2011-09-23
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| 基金项目: |
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| Experimental Characterization of the Joule-Thomson Cryostat of a Cryoprobe |
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| Abstract: |
| Various experiments were conducted to measure the temperature and flow rate of a Joule-Thomson cryostat corresponding to different precooling temperatures of nitrogen and thermalload. The results demonstrated that the steady-state temperature of cryoprobe changed with precooling temperature, and that the greater the thermal load, the lower the requisite precooling temperature of the nitrogen passing through the Joule-Thomson cryostat. The experiments further indicated that too low precooling temperature of nitrogen is not necessary as it may cause a great waste of nitrogen and lower heat exchanger efficiency; and the nitrogen flow rate increased as the outlet temperature of supply nitrogen decreased. The calculated results of nitrogen flow rate correlated well with the experimental measurement. |
| Key words: pyrology joule-thomson cryostat cryoprobe cryoablation |
