池外沸腾传热的水和纳米流体表面具有较高的粗糙度和不同的润湿性

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Nanoscale and Microscale Thermophysical Engineering Pub Date : 2018-09-07 DOI:10.1080/15567265.2018.1497110

W. Ji, P. Zhao, Chuang-Yao Zhao, Jing Ding, W. Tao

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引用次数: 24

摘要

摘要为了研究表面润湿性对池沸腾传热的影响，采用去离子水和二氧化硅基纳米流体进行了成核池沸腾实验。测试了3.9～6.0μm范围内较高的表面粗糙度值。接触角从4.7°到153°，热通量从30kW/m2到300kW/m2。实验结果表明，亲水性降低了二氧化硅纳米流体在粗糙度较高表面上的沸腾传热。随着纳米流体质量浓度从0.025%增加到0.1%，观察到传热系数进一步降低。对于粗糙度较高（接触角153.0°）的超疏水表面，在热通量小于93kW/m2时，沸腾传热增强，然后在热通量较高时，传热退化。

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Pool boiling heat transfer of water and nanofluid outside the surface with higher roughness and different wettability

ABSTRACT In order to investigate the effect of surface wettability on the pool boiling heat transfer, nucleate pool boiling experiments were conducted with deionized water and silica based nanofluid. A higher surface roughness value in the range of 3.9 ~ 6.0μm was tested. The contact angle was from 4.7° to 153°, and heat flux was from 30kW/m2 to 300kW/m2. Experimental results showed that hydrophilicity diminish the boiling heat transfer of silica nanofluid on the surfaces with higher roughness. As the increment of nanofluid mass concentration from 0.025% to 0.1%, a further reduction of heat transfer coefficient was observed. For the super hydrophobic surface with higher roughness (contact angle 153.0°), boiling heat transfer was enhanced at heat flux less than 93 kW/m2, and then the heat transfer degraded at higher heat flux.

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.