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首页> 外文期刊>International journal of air-conditioning and refrigeration >EXPERIMENTAL POOL BOILING HEAT TRANSFER STUDY OF THE NANOPOROUS COATING IN VARIOUS FLUIDS
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EXPERIMENTAL POOL BOILING HEAT TRANSFER STUDY OF THE NANOPOROUS COATING IN VARIOUS FLUIDS

机译:各种流体纳米涂层的实验池沸腾传热研究

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摘要

An experimental pool boiling study was conducted using plain and nanoporous coated heater surfaces immersed in various working fluids: water, ethanol and HFE-7100. Pool boiling tests were performed on flat 1 cm × 1 cm heaters. Unlike in water, the critical heat flux (CHF) enhancement of the nanoporous coating seems to be less or marginal in ethanol and HFE-7100 at 1 atm. The reduced effect of the nanoporous coating in ethanol and HFE-7100 is believed to be due to the highly wetting nature of these fluids since no obvious difference in wettability is observed between nanoporous coated and uncoated surfaces through apparent contact angle measurement. Moreover, pressure effects were also investigated for the fluids mentioned above. For the nanoporous coated surface, CHF enhancement of the nanoporous coating appeared to be dependent on the test pressure, showing greater CHF enhancement at lower pressure. It is believed that this pressure dependent CHF enhancement behavior could be closely related to the bubble departure diameter. As pressure lowers, the departure bubble size increases and this allows the nanoporous coating 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:水,乙醇和HFE-7100中的普通和纳米多孔涂层加热器表面进行了实验性池沸腾研究。池沸腾测试在1 cm×1 cm的扁平加热器上进行。与在水中不同,在乙醇和HFE-7100中,在1个大气压下,纳米多孔涂层的临界热通量(CHF)增强似乎很少或几乎没有。认为纳米多孔涂层在乙醇和HFE-7100中的作用降低是由于这些流体的高度润湿性,因为通过表观接触角测量未观察到纳米多孔涂层和未涂层​​表面之间的润湿性明显差异。此外,还研究了上述流体的压力效应。对于纳米多孔涂层的表面,纳米多孔涂层的CHF增强似乎取决于测试压力,在较低压力下显示出更大的CHF增强。据信,这种与压力有关的CHF增强行为可能与气泡离开直径密切相关。随着压力降低,离开气泡的大小增加,这使纳米多孔涂层(即使对于高度润湿的流体)也更具影响力,从而延迟了局部变干,进而导致CHF增强。

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