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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and theoretical studies on the droplet temperature behavior of R407C two-phase flashing spray
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Experimental and theoretical studies on the droplet temperature behavior of R407C two-phase flashing spray

机译：R407C两相闪蒸液滴温度行为的实验和理论研究

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摘要

Flashing spray is a common phenomenon in many industrial fields. A rapid droplet temperature change in flashing spray is an important feature, which distinguishes this phenomenon from other traditional sprays. This study provides first-hand droplet temperature data of an R407C flashing spray, which serves as a substitute for R22, by conducting systematic experiments. A coupled droplet evaporation model is also introduced to predict the droplet temperature of flashing spray, rather than CFD simulation, for the first time considering the coupling of heat and mass transfer between a droplet surface and its surrounding region of influence. Experimental result shows that droplet temperature first decreases rapidly with axial distance, and then a gradual decrease in the downstream until its minimum value is reached. A hot core is observed near the nozzle exit, where the droplet temperature is higher at the spray center than in its periphery region. Droplet radial temperature distribution becomes uniform in the far spray field. The interaction of heat and mass transfer between the droplet surface and its surrounding region of influence is revealed using a coupled evaporation model. That is, the vapor mass fraction and temperature of the influence region undergo increase and decrease with evaporating time, respectively. Therefore, the coupled evaporation model presents better performance than a one-way evaporation model in predicting droplet minimum temperature. This predictive result agrees well with the experimental data. The minimum temperature of a predictive droplet is independent of the initial diameter and velocity of this droplet. (C) 2019 Elsevier Ltd. All rights reserved.
机译：闪蒸是许多工业领域中的常见现象。闪蒸喷雾中液滴温度的快速变化是一个重要特征，这使这种现象与其他传统喷雾区别开来。这项研究通过进行系统性实验，提供了R407C闪蒸喷雾的第一手液滴温度数据，该数据可替代R22。还首次引入耦合的液滴蒸发模型来预测闪蒸喷雾的液滴温度，而不是CFD模拟，这是首次考虑液滴表面及其周围影响区域之间的传热和传质耦合。实验结果表明，液滴温度首先随着轴向距离迅速降低，然后在下游逐渐降低，直到达到最小值。在喷嘴出口附近观察到热芯，在喷嘴中心，液滴温度比其外围区域的液滴温度高。在远处的喷雾场中，液滴的径向温度分布变得均匀。使用耦合蒸发模型揭示了液滴表面及其周围影响区域之间的传热和传质相互作用。即，影响区域的蒸气质量分数和温度分别随着蒸发时间而增加和减少。因此，在预测液滴最低温度时，耦合蒸发模型比单向蒸发模型表现出更好的性能。这一预测结果与实验数据非常吻合。预测液滴的最低温度与该液滴的初始直径和速度无关。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
  • 作者

    Zhou Zhi-Fu; Hu Meng-Yuan; Xin Hui; Chen Bin; Wang Guo-Xiang;

  • 作者单位

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China|Univ Akron, Dept Mech Engn, Akron, OH 44325 USA;

  • 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

    Flashing spray; Droplet temperature; Evaporation; Coupled evaporation model; R407C;

    机译：闪蒸;液滴温度;蒸发;耦合蒸发模型;R407C;

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