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An experimental study on liquid nitrogen pipe chilldown and heat transfer with pulse flows

机译：液氮管脉动冷却与传热的实验研究。

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摘要

In order to provide the optimized chilldown strategy for a cryogenic transport line, a study on pulse flow chilldown was conducted. A comparison between continuous flow and pulse flow patterns on heat transfer characteristics was presented to reveal the effect of flow oscillation. Liquid nitrogen was used as the working fluid and upward flows with Reynolds numbers ranging from 2500 to 7000 in a round tube were examined. To gain a better understanding of the effect of flow pulsation on the chilldown process, different square wave pulse flow strategies were examined. Analysis of the ability of different flow patterns to chill down transport lines indicated that there is no single best strategy for all boiling regimes and Reynolds numbers. In terms of the efficiency, the continuous flow is optimal for most boiling regimes at low Reynolds numbers. On the other hand, pulse flow is ideal in the film boiling regime at higher Reynolds numbers. In terms of the total efficiency, continuous flows with high Reynolds numbers are generally more efficient at transferring heat than other patterns or those of lower Reynolds numbers. If a short chilldown duration is a priority, the continuous flow consistently offers the quickest chilldown times. A general guideline for chilldown strategy is suggested as a conclusion.
机译：为了给低温输送线提供优化的冷却策略，进行了脉冲流冷却的研究。比较了连续流动和脉冲流动模式对传热特性的影响，以揭示流动振荡的影响。使用液氮作为工作流体，并检查了圆管中雷诺数在2500至7000之间的向上流动。为了更好地了解流动脉动对冷却过程的影响，我们研究了不同的方波脉冲流动策略。对不同流型冷却输送线能力的分析表明，对于所有沸腾状态和雷诺数，没有单一的最佳策略。就效率而言，连续流对于低雷诺数下的大多数沸腾状态都是最佳的。另一方面，在更高的雷诺数下，脉冲流在薄膜沸腾过程中是理想的。就总效率而言，具有高雷诺数的连续流通常比其他模式或具有较低雷诺数的模式更有效地传递热量。如果需要较短的冷却时间，则连续流将始终提供最快的冷却时间。作为结论，提出了冷却策略的一般指南。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2013年第12期|955-966|共12页
  • 作者

    Reid Shaeffer; Hong Hu; J.N. Chung;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States;

    Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States;

    Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, United States;

  • 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

    Chilldown; Cryogenic; Flow boiling; Pulse flow;

    机译：冷静;低温流沸腾;脉冲流量;

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