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Research on the air-side thermal hydraulic performance of louvered fin and flat tube heat exchangers under low-pressure environment.
- Source :
- Experimental Heat Transfer; 2020, Vol. 33 Issue 1, p81-99, 19p, 4 Diagrams, 4 Charts, 12 Graphs
- Publication Year :
- 2020
-
Abstract
- In order to solve the problem of overheating of the engine and cooling system of the vehicle in the plateau low-pressure environment, it is necessary to study air-side thermal-hydraulic performance of the vehicle cooling system heat exchanger under low-pressure environment. In this paper, the experimental study on the louvered fin and flat tube heat exchanger of the vehicle is carried out on the low-pressure wind tunnel test bench. The results show that at a gauge pressure of −44 kPa, the air-side convective heat transfer coefficient is reduced by 33.5%~23.3% compared with 0 kPa; the Colburn j-factor is increased by 36.8% on average; the f factor is increased by 51.2% on average. Based on this, numerical simulations are carried out to study the heat transfer and flow characteristics of louvered fins with different structural parameters under low-pressure environment. The empirical correlations of Colburn j-factor and Friction factor f are fitted by multiple linear regression. In the range of gauge pressure from 0 kPa to −44 kPa, the average deviation of the correlation calculation result of Colburn j-factor is 3.4%, and the average deviation of the correlation calculation result of f factor is 5.5%. The research results can provide a basis for the design of louvered fin heat exchangers utilized in the plateau environment. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08916152
- Volume :
- 33
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Experimental Heat Transfer
- Publication Type :
- Academic Journal
- Accession number :
- 139682966
- Full Text :
- https://doi.org/10.1080/08916152.2019.1570985