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On-line Access: 2016-06-03

Received: 2015-09-26

Revision Accepted: 2016-04-13

Crosschecked: 2016-05-11

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Yong-hua Huang


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


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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%T Numerical investigation on thermal effects by adding thin compartmental plates into cooling enclosures with heat-leaking walls
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%A Qiang Chen
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1500319

T1 - Numerical investigation on thermal effects by adding thin compartmental plates into cooling enclosures with heat-leaking walls
A1 - Yong-hua Huang
A1 - Qiang Chen
J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1500319

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.


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。


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