The unsteady heat transfer test of the surrounding rock

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.

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Unsteady Heat Transfer and Entropy Generation Study on Viscoelastic Fluid Flow Coupled with Induced Magnetic Field

Iranian Journal of Science and Technology Transactions A Science ◽

10.1007/s40995-021-01126-z ◽

2021 ◽

Author(s):

Lipika Panigrahi ◽

Jayaprakash Panda ◽

Sudhansu S. Sahoo

Keyword(s):

Magnetic Field ◽

Heat Transfer ◽

Fluid Flow ◽

Viscoelastic Fluid ◽

Entropy Generation ◽

Induced Magnetic Field ◽

Unsteady Heat Transfer

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Conjugate unsteady heat transfer from a sphere in Stokes flow

Chemical Engineering Science ◽

10.1016/s0009-2509(97)00085-7 ◽

1997 ◽

Vol 52 (16) ◽

pp. 2845-2848 ◽

Cited By ~ 13

Author(s):

Gh. Juncu

Keyword(s):

Heat Transfer ◽

Stokes Flow ◽

Unsteady Heat Transfer

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The Infrared Characteristics of the Wall Temperature of Boiling Heat Transfer in Microchannel

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.811 ◽

2011 ◽

Vol 383-390 ◽

pp. 811-815

Author(s):

Hu Gen Ma ◽

Jian Mei Bai ◽

Rong Jian Xie ◽

Wen Jing Tu

Keyword(s):

Heat Transfer ◽

Heat Flux ◽

Wall Temperature ◽

Boiling Heat Transfer ◽

Transfer Test ◽

Axial Direction ◽

Transfer Model ◽

Micro Channel ◽

Vapor Quality ◽

Test Rig

In this paper, the boiling heat transfer test rig was designed and built, while the characteristics of boiling Heat Transfer of refrigerants in micro-channel was researched. The wall temperature of micro-channel was measured by TH5104 Infrared thermography. The results showed that there were obvious variations for wall temperature of micro-channel along the axial direction when boiling heat transfer occurred in the micro-channel. The temperature distribution affected obviously by the heat flux, mass flow rate; vapor quality and heat transfer model.

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