The role of enhancement techniques on heat and mass transfer characteristics of shell and tube spray evaporator: A detailed review
The role of enhancement techniques on heat and mass transfer characteristics of shell and tube spray evaporator: A detailed review
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DOI：
10.1016/j.applthermaleng.2014.10.020
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发表时间：
2015-01
影响因子：
6.4
通讯作者：
A. Abed;M. Alghoul;M. H. Yazdi;A. Al-Shamani;K. Sopian
中科院分区：
文献类型：
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作者：
A. Abed;M. Alghoul;M. H. Yazdi;A. Al-Shamani;K. Sopian
由于降膜现象在实际应用中的复杂性，水平壳侧蒸发器的降膜传热一直是科学家们感兴趣的问题。然而，喷雾蒸发器的传热传质特性仍有待进一步提高。本文对纳米颗粒悬浮在制冷剂中的增强技术和降膜流的作用进行了综述，以证实它们的作用。研究涵盖了表面几何形状（管束和管外）、普通单管、低翅片和增强几何管的影响；添加剂的影响；以及基于制冷剂的纳米流体的应用及相关问题。讨论了具有能量相关成本的换热面积和换热系数经验相关性的重要研究成果。研究发现，降膜流动中传热传质过程的相互作用和纳米流体热物理性质的矛盾都需要仔细考虑。此外，现有的关于纳米流体传热传质的研究还不充分，仍然需要对其重要参数进行大量的实验和理论研究。最后，本研究强调了影响喷雾蒸发器效率、紧凑性和成本的因素以及增强技术的潜力。
Falling film heat transfer of horizontal shell-side evaporators remains of interest to scientists due to the complexity of these phenomena for practical applications. However, characteristics of heat and mass transfers of spray evaporators are still subject to further enhancement. This study is to review the enhancement techniques and falling film flow especially the effect of nanoparticles suspended with refrigerants in order to confirm their role. The study covers the influence of surface geometry (bundles and external of tubes), normal single tube, low fins, and enhanced geometrical tubes; effect of additives; and the applications and problems related to refrigerant-based nanofluids. Heat transfer area with energy related cost and the significant efforts on empirical correlations for heat transfer coefficient are discussed. It is found that the interaction of the heat and mass transfer process on falling film flow and contradictions of thermal physical properties of nanofluids should all be taken into careful consideration. In addition, existing research on both heat and mass transfer regarding nanofluids are found to be inadequate, and still requires extensive experimental and theoretical work on their salient parameters. Finally, this study highlights the factors affecting efficiency, compactness, and cost of the spray evaporator and the potential of enhancement techniques.