A note on thermal history kernel for unsteady heat transfer of a spherical particle

2021 ◽  
Vol 180 ◽  
pp. 121781
Author(s):  
S. Balachandar ◽  
M.Y. Ha
Keyword(s):  
Heat Transfer ◽  
Spherical Particle ◽  
Thermal History ◽  
Unsteady Heat Transfer

scholarly journals Predicting unsteady heat transfer effect of vehicle thermal management system using steady velocity equivalent method

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110259
Author(s):  
Xiao Guoquan ◽  
Wang Huaming ◽  
Chen Lin ◽  
Hong Xiaobin
Keyword(s):  
Heat Transfer ◽  
Thermal Management ◽  
Management System ◽  
Exhaust System ◽  
Transfer Effect ◽  
Unsteady Heat Transfer ◽  
Thermal Management System ◽  
Comparison Results ◽  
Equivalent Method ◽  
Steady Velocity

In the process of vehicle development, the unsteady simulation of thermal management system is very important. A 3D-CFD calculation model of vehicle thermal management is established, and simulations were undertaken for uphill with full loads operations condition. The steady results show that the surface heat transfer coefficient increases to the quadratic parabolic relationship. The unsteady results show that the pulsating temperatures of exhaust and external airflow are higher than about 50°C and lower than 10°C, respectively, and the heat dissipating capacities are higher than about 11%. Accordingly, the conversion equivalent exhaust velocity increased by 1.67%, and the temperature distribution trend is basically the same as unsteady results. The comparison results show that the difference in the under-hood should be not noted, and that the predicted exhaust system surface temperatures using steady velocity equivalent method are low less 10°C than the unsteady results. These results show the steady velocity equivalent method can be used to predict the unsteady heat transfer effect of vehicle thermal management system, and the results obtained by this method are basically consistent with the unsteady results. It will greatly save computing resources and shorten the cycle in the early development of the vehicle thermal management system.

Numerical study of the problem of unsteady heat transfer in a cased-well-bed system

1991 ◽  
Vol 60 (5) ◽  
pp. 645-650
Author(s):  
I. V. Il'in ◽  
A. S. Kashik ◽  
Yu. A. Popov ◽  
S. D. Tseitlin
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Unsteady Heat Transfer
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