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CLC number: TB611

On-line Access: 2016-06-03

Received: 2015-09-26

Revision Accepted: 2016-04-13

Crosschecked: 2016-05-11

Cited: 0

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Yong-hua Huang

http://orcid.org/0000-0001-6453-8430

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Journal of Zhejiang University SCIENCE A 2016 Vol.17 No.6 P.485-496

http://doi.org/10.1631/jzus.A1500319


Numerical investigation on thermal effects by adding thin compartmental plates into cooling enclosures with heat-leaking walls


Author(s):  Yong-hua Huang, Qiang Chen

Affiliation(s):  Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

Corresponding email(s):   huangyh@sjtu.edu.cn

Key Words:  Plate, Enclosure, Natural convection, Lattice Boltzmann, Cooling rate, Temperature uniformity


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Yong-hua Huang, Qiang Chen. Numerical investigation on thermal effects by adding thin compartmental plates into cooling enclosures with heat-leaking walls[J]. Journal of Zhejiang University Science A, 2016, 17(6): 485-496.

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Abstract: 
Adding thin compartmental plates near the internal walls of enclosures has been numerically modeled using the lattice Boltzmann method. This practice was found to be an effective way to further suppress the disadvantageous effects of heat leak, along with the application of insulation materials on the external surfaces. A modified extrapolation scheme for handling the thermal boundary of the thin plate was proposed and verified by comparison with the conventional coupled boundary scheme. The simulation of the natural convection during the cooling down processes and at steady states in the enclosure indicates that the existence of the plates leads to a higher cooling rate and a more favorable temperature uniformity. For a typical case, the one with plates takes 6% less time to reach the halfway point of the steady state and has 26% less temperature variance. Effects by the plates’ positions and sizes were parametrically investigated, in order to find an optimal geometrical configuration. In addition, the fluid’s intrinsic characteristics and the relative heat leak by using the Rayleigh number and Nusselt number, respectively, have been discussed in detail through hydrodynamic and convective heat transfer analyses.

壁面漏热的冷却腔体内增加薄壁隔板引起的热效应数值研究

目的:评估增加薄壁隔板对于降低封闭腔中漏热面的作用,为在实际系统中采用薄壁隔板提高温度均匀性的可行性提供理论依据。
创新点:提出一种新的非平衡态外推边界处理方法;提出在封闭冷却墙体内增加薄壁隔板的有效漏热控制方法。
方法:采用热格子波尔兹曼(Boltzmann)方法以及针对薄壁隔板的改进型非平衡态热边界条件处理方法,将数值计算与理论分析相结合,研究漏热冷却腔体内的动态过程。
结论:1. 在漏热壁面附近增加薄壁隔板可使壁面漏热的冷却箱体内降温时间缩短,并且最终达到更好的温度均匀性。2. 薄壁隔板的位置靠近漏热面可增强其效果,隔板尺寸越大效果越好。3. 在更大的努塞尔数(Nu)或更小的瑞利数(Ra)条件下,增加隔板所起到的效果更加明显。

关键词:隔板;封闭腔;自然对流;格子波尔兹曼;冷却速率;温度均匀性

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