Modeling and Analysis of Porous Platinum Nanolayer Used in Thin Film Boiling by Resistor Network Approach
Modeling and Analysis of Porous Platinum Nanolayer Used in Thin Film Boiling by Resistor Network Approach
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通过电阻网络方法对用于薄膜沸腾的多孔铂纳米层进行建模和分析
DOI：
10.1016/j.ijheatmasstransfer.2021.121169
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发表时间：
2021-06
影响因子：
5.2
通讯作者：
Dawen Zhong
中科院分区：
文献类型：
--
作者：
Lin Chen;Jiahua Li;Yanchao Lv;Fengchu Jin;Haizhen Xian;Jun Lin;Dawen Zhong
利用纳米多孔膜可以实现一种新的薄膜沸腾制度，其传热通量超过1 kW/cm 2。在薄膜沸腾实验中，纳米尺度的铂（Pt）层涂层既是加热器又是温度传感器，因此起着至关重要的作用。然而，实验后在Pt层中发现了河流状的微裂纹，其成因和影响尚不清楚。本文基于微观观察，将多孔铂层抽象为电阻网络。建立了一个综合模型，通过获得网络中所有电阻的电阻和温度来定量分析Pt层。利用该模型成功地模拟了河流状裂纹的形成过程，并详细分析了Pt层厚度均匀性对裂纹形成的影响。结果表明，该裂纹是由电阻的连续熔化形成的，从较薄或较厚的电阻及其相邻的较早达到临界热流密度（CHF）的电阻开始，以类似于链式反应的方式扩展到Pt层的其他部分。对于理想的均匀厚度的Pt层，它可以消除河流状裂纹，获得更高的CHF和更宽的电压变化的耐受性。对铂层的深入研究不仅有助于薄膜相变传热的基础研究，也有助于其他纳米导电层的研究。
Utilizing nanoporous membranes can realize a new thin film boiling regime with ultrahigh heat flux of over 1 kW/cm2. In thin film boiling experiments, a nanoscaled platinum (Pt) layer coating serves as both heater and temperature sensor and therefore plays a fundamentally important role. However, river-shaped micro cracks were discovered in the Pt layer after experiments, of which the origin and the influence are still unclear. In this paper, based on the microscopic observation, the porous Pt layer was abstracted as a resistor network. A comprehensive model was set up to quantitatively analyze the Pt layer by obtaining the resistance and temperature of all the resistors in the network. With this model, the formation of the river-shaped cracks was successfully simulated and the influence of the thickness uniformity of Pt layer was analyzed in detail. It was found that the river-shaped cracks were formed by the successive melting of resistors, which started from the thinner or thicker resistor and its adjacent resistors that achieved critical heat flux (CHF) earlier than the rest resistors, and then spread to the other part of the Pt layer in a way similar to a chain reaction. For ideal Pt layer with uniform thickness, it could eliminate the river-shaped cracks, achieve higher CHF and endure a wider voltage variation. The in-depth modeling on Pt layer may not only help the fundamental study of the thin film phase change heat transfer, but also contribute to the research of other nanoscaled conductive layers.
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影响因子：
--
作者：
Coso, Dusan;Srinivasan, Vinod;Majumdar, Arun
通讯作者：
Majumdar, Arun
DOI：
10.1016/j.ijheatmasstransfer.2020.119673
发表时间：
2020-01
影响因子：
5.2
作者：
Qingyang Wang;Yang Shi;Renkun Chen
通讯作者：
Qingyang Wang;Yang Shi;Renkun Chen
DOI：
10.1080/15567260802625908
发表时间：
2009-02
影响因子：
4.1
作者：
S. Narayanan;A. Fedorov;Y. Joshi
通讯作者：
S. Narayanan;A. Fedorov;Y. Joshi
影响因子：
4
作者：
Kim, S. J.;Bang, I. C.;Hu, L. W.
通讯作者：
Hu, L. W.
影响因子：
6.2
作者：
Chen, Dustin;Zhao, Fangchao;Pei, Qibing
通讯作者：
Pei, Qibing