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首页> 外文会议>27th Annual IEEE Semiconductor Thermal Measurement and Management Symposium >Pool boiling heat transfer characteristics of nanocoating in various working fluids
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Pool boiling heat transfer characteristics of nanocoating in various working fluids

机译：纳米涂层在各种工质中的池沸腾传热特性

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An experimental pool boiling study was conducted using plain and nanocoated heater surfaces immersed in various working fluids. Working fluids include water, ethanol and HFE-7100 and pool boiling tests were performed on a flat 1 cm × 1 cm heaters. Unlike in water, CHF enhancement of the nanocoating seems to be less or marginal in ethanol and HFE-7100 at 1 atm. The reduced effect of the nanocoating in ethanol and HFE-7100 is believed to be due to the highly wetting nature of these fluids since no obvious difference in wettability through apparent contact angle measurement is observed between nanocoated and uncoated surfaces at 1 atm. Moreover, pressure effects were also investigated for the fluids mentioned above. The uncoated and nanocoated surfaces were tested in the working fluids at four different pressures. For the uncoated surface, measured CHF values closely matched those of Zuber''s [13]. In the case of the nanocoated surface, CHF enhancement of the nanocoating appeared to be dependent on the test pressure, showing the greatest CHF enhancement value at the lowest pressure and the enhancement decreased as the pressure increased. Although CHF enhancement of pure water was superior to that of other fluids, it was observed that there was also noticeable CHF enhancement as pressure decreased for the highly wetting fluids. It is believed that this enhancement could be closely related to the bubble departure diameter. As the test pressure decreases, the departure bubble size increases and this allows the nanocoating to become more influential, even for the highly wetting fluids, in delaying local dry-out, which in turn results in increasing CHF enhancement.
机译：使用浸没在各种工作流体中的普通和纳米涂层加热器表面进行了实验性池沸腾研究。工作液包括水，乙醇和HFE-7100，池沸腾测试是在1 cm×1 cm的扁平加热器上进行的。与在水中不同的是，在1 atm的乙醇和HFE-7100中，纳米涂层的CHF增强作用似乎很少或几乎没有。认为纳米涂层在乙醇和HFE-7100中的作用降低是由于这些流体的高度润湿性，因为在1 atm的情况下，在纳米涂层和未涂层​​表面之间未观察到通过表观接触角测量得出的润湿性的明显差异。此外，还研究了上述流体的压力效应。在工作流体中在四种不同压力下测试了未涂层和纳米涂层的表面。对于未涂层的表面，测得的CHF值与Zuber的值非常匹配[13]。在纳米涂层表面的情况下，纳米涂层的CHF增强似乎取决于测试压力，在最低压力下显示最大的CHF增强值，并且随着压力的增加，增强降低。尽管纯净水的CHF增强效果优于其他流体，但可以观察到，随着高度润湿的流体压力降低，CHF也会显着提高。相信这种增强可能与气泡离开直径密切相关。随着测试压力的降低，离开气泡的大小增加，这使纳米涂层在延迟局部变干方面，甚至对于高度润湿的流体，也具有更大的影响力，进而导致CHF增强。

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