Enhanced boiling heat transfer by nano structured surfaces and nanofluids
Enhanced boiling heat transfer by nano structured surfaces and nanofluids
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DOI：
10.1016/j.rser.2017.10.069
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发表时间：
2018-02
影响因子：
15.9
通讯作者：
C. Prakash;R. Prasanth
中科院分区：
文献类型：
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作者：
C. Prakash;R. Prasanth
为了满足未来的能源需求，许多有趣的技术已经在文献中报道，用于改善沸腾传热使用纳米颗粒和纳米结构表面。这种新技术可以大大改变水冷反应堆和直接蒸汽发生器的传热方式和效率。沸腾传热是许多工程传热和冷却应用中越来越感兴趣的领域。核态沸腾是池沸腾的有效传热区域。临界热流密度通过在加热器表面形成蒸汽膜而导致沸腾危机，从而使沸腾机制从高效模式转变为低效模式。造成这场沸腾危机的实际机制仍然是一个灰色地带。在沸腾传热应用中，CHF参数是不可避免的，相反，它可以通过采用流体和表面改性技术来推迟。本文分析了纳米改性强化池沸腾的研究现状，并将实验结果与理论预测进行了比较。现有的理论模型不能令人满意地解释实验研究。新的研究技术和更好的相关性之间的改性表面性能的热流是不可避免的进一步改善。
In order to meet the future energy demands many interesting techniques have been reported in literature for improving boiling heat transfer using nanoparticles and nano-structured surfaces. The mode of heat transfer and efficiency of water cooled reactors, direct steam generators can be substantially modified by this new technology. Boiling heat transfer is an area of increasing interest in many engineered heat transfer and cooling applications. Nucleate boiling is the efficient heat transfer region in pool boiling. The critical heat flux changes boiling mechanism from efficient mode to inefficient mode by forming a vapor film over the heater surface that leads to boiling crisis. The actual mechanism that creates this boiling crisis still remains a grey area. The CHF parameter cannot be avoided in boiling heat transfer applications; instead it can be postponed by adopting fluid and surface modification techniques. This review analyzes the present status of nano-modification for enhancing the pool boiling and critically compares the experimental results with the theoretical predictions. The existing theoretical models are not satisfactorily explaining the experimental investigations. New investigation techniques and better correlation between the modified surface properties to the heat flux is inevitable for further improvement.