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首页> 外文期刊>Journal of enhanced heat transfer >INFLUENCE OF NONCONDENSABLE GAS TO CONDENSATION OF WATER IN A NANOSCALE SPACE USING MOLECULAR DYNAMICS SIMULATION
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INFLUENCE OF NONCONDENSABLE GAS TO CONDENSATION OF WATER IN A NANOSCALE SPACE USING MOLECULAR DYNAMICS SIMULATION

机译：分子动力学模拟不可冷凝气体对纳米尺度空间中水的冷凝的影响

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摘要

The existence of noncondensable gases has a great effect on the condensation heat transfer coefficient. It is necessary to exclude noncondensable gases and maintain the vacuum degree to improve heat transfer in some industrial phase-change heat exchangers. Nevertheless, to better control the temperature needed to increase thermal resistance to decrease or adjust the heat transfer, using noncondensable gases is an effective method. Understanding heat transfer and dynamics characteristics of noncondensable gases at nanoscale are of great interest in both theoretical and practical applications. In the present study, the influence of noncondensable gases to phase change in confined nanoscale space was investigated by using molecular dynamics simulation. Vapor nitrogen was used as the noncondensable gas put into the working fluid region that contains the liquid and vapor water. The temperature and distribution of the density of working fluid was obtained and the trajectories of some water molecules and nitrogen molecules were tracked. As time passes, more and more water molecules condense at the cold wall, whereas a certain number of nitrogen molecules fluctuate in the working fluid region beside the accumulated nitrogen molecules at the cold end to resist the heat transfer and increase the temperature difference. The results revealed the influence of noncondensable gases to phase change from the nanoscale aspect. The enhancement of heat transfer could be realized and controlled through the regulation of the noncondensable gases in the working fluid.
机译：不可冷凝气体的存在对冷凝传热系数有很大影响。必须排除不凝性气体并保持真空度，以改善某些工业相变热交换器中的热传递。然而，为了更好地控制增加热阻以降低或调节热传递所需的温度，使用不可冷凝气体是一种有效的方法。在理论和实际应用中，了解纳米级不凝性气体的传热和动力学特性都非常重要。在本研究中，通过使用分子动力学模拟研究了不可冷凝气体对受限纳米级空间中相变的影响。蒸气氮用作进入包含液体和蒸气水的工作流体区域的不凝气体。获得了工作流体的温度和密度分布，并跟踪了一些水分子和氮分子的轨迹。随着时间的流逝，越来越多的水分子在冷壁处凝结，而一定数量的氮分子在工作流体区域中在冷端处积聚的氮分子旁波动，以抵抗热传递并增加温度差。结果从纳米尺度揭示了不可冷凝气体对相变的影响。通过调节工作流体中的不可冷凝气体，可以实现并控制热量的传递。

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