Research on the heat transfer and flow characteristics of fin-tube exchanger under low pressure environment

Jia, Run-ze; Wang, Yichun; Guo, Jin; Yu, Zhiyi; Kang, Huifang

doi:10.1016/j.applthermaleng.2016.06.137

Cited by 23 publications

(4 citation statements)

References 10 publications

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“…The change is due to the enhancement of the thermal boundary layer under negative pressure. Temperature gradients are distributed in the boundary layer and the variation in the boundary layer at low pressure show a strong influence on the thermal and flow behavior [ 26 ]. Due to the impact of lower environment pressure on the physical properties of air, heat transfer is more intense when the air flows across the fin.…”

Section: Resultsmentioning

confidence: 99%

“…Up to now, studies on heat exchangers operating at negative pressure were also conducted by some researchers. Jia et al [ 26 , 27 ] experimentally and numerically studied the effects of low pressure environment on the air-side heat exchange and flow properties of a plate-fin heat exchanger. It is reported that, compared with atmospheric pressure, the thermal and flow performance is dramatically changed under low pressure environment.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Fin-and-Tube Heat Exchanger in Low-Pressure Environment: Air-Side Heat Transfer and Frictional Performance, Entropy Generation Analysis, and Model Development

Zhang

Wang

Liu

et al. 2022

Entropy

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Heat transfer and frictional performance at the air-side is predominant for the application and optimization of finned tube heat exchangers. For aerospace engineering, the heat exchanger operates under negative pressure, whereas the general prediction models of convective heat transfer coefficient and pressure penalty for this scenario are rarely reported. In the current study, a numerical model is developed to determine the air-side heat transfer and frictional performance. The influence of air pressure (absolute pressure) is discussed in detail, and the entropy generation considering the effect of heat transfer and pressure drop are analyzed. Furthermore, prediction models of air-side thermal and frictional factors are also developed. The results indicate that both the convective heat transfer coefficient and pressure penalty decrease significantly with decreasing air pressure, and the air-side heat transfer coefficient is decreased by 64.6~73.3% at an air pressure of 25 kPa compared with normal environment pressure. The entropy generation by temperature difference accounts for the highest proportion of the total entropy generation. The prediction correlations of Colburn j-factor and friction factor f show satisfactory accuracy with the absolute mean deviations of 7.48% and 9.42%, respectively. This study can provide a reference for the practical application of fined tube heat exchangers under a negative pressure environment.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Fin-and-Tube Heat Exchanger in Low-Pressure Environment: Air-Side Heat Transfer and Frictional Performance, Entropy Generation Analysis, and Model Development

Zhang

Wang

Liu

et al. 2022

Entropy

View full text Add to dashboard Cite

show abstract

“…Therefore, the air side flow and heat transfer characteristics under low pressure environment are mainly analyzed in this paper. According to the literature [5], the thickness of the thermal boundary-layer of the air-flow increases with the decrease of the gas density, so the thickness of the gas thermal boundary-layer under low pressure environment will increase, which will increase the thermal resistance, resulting in the convection heat transfer coefficient reduce.…”

Section: Heat Transfer and Flow Characteristics Of Heat Exchangersmentioning

confidence: 99%

“…The calculation results show that the air side convection heat transfer coefficient at an altitude of 5000 m decreases by 22~33% compared with that at the plain. Jia et al [5,6] studied the heat transfer and flow resistance performance of a louvered fin heat exchanger under low pressure environment. The results show that the air side convection heat transfer coefficient decreases with the decrease of the ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer and flow characteristics of offset fin and flat tube heat exchangers under low pressure environment

et al. 2020

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Due to the performance degradation of the vehicle cooling system heat exchanger in the low pressure environment, the problem of overheating of the cooling system occurs when the vehicle is running on the plateau. This seriously affects the use of vehicles on the plateau environment. Therefore, it is necessary to study the influence of the plateau low pressure environment on the heat transfer and flow characteristics of the vehicle cooling system heat exchanger. In this paper, an experimental study of an offset fin and flat tube heat exchanger was conducted on a low pressure wind tunnel test bench, and the heat transfer and flow characteristics of the heat exchanger under different gauge pressure conditions were analyzed. Based on this, numerical simulations were carried out to study the heat transfer and flow characteristics of the heat exchanger with different structural parameters under low pressure environment. The empirical correlation of Colburn factor, j, and friction factor, f, were fitted using multiple linear regression. The research results can provide help for the engineering calculation of the offset fin and flat tube heat exchanger.

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Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

Wan

Liu

et al. 2022

Advcd Theory and Sims

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The purpose of this paper is to study the effect of the structural parameters of louvered fin radiators on its thermal‐hydraulic performance, optimize its structural parameters, and improve the performance of louvered fin radiators in negative gauge pressure condition. The thermal calculation model of louvered fin radiator in negative gauge pressure is established. Then, the effects of design variables on thermal‐hydraulic characteristics are investigated. The second generation of nondominated sorting genetic algorithm (NSGA‐II) is applied to optimize the louvered fin heat exchanger in negative gauge pressure environment. Technique for order preference by similarity to an ideal solution is applied to choose the final optimal solution. Numerical simulation of the solution is conducted and the result is compared with literature in order to verify the optimization method. The optimal structural parameters are obtained under constraints. Compared with the original test piece, the heat transfer rate of optimal solution is increased by 7.7%, and total annual cost is reduced by 24.8%. The present paper establishes optimization method of louvered fin radiators in negative gauge pressure condition, the optimization result is superior to the original radiator. The optimization method can be used in the design of radiators operating in negative gauge pressure conditions.

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Research on the heat transfer and flow characteristics of fin-tube exchanger under low pressure environment

Cited by 23 publications

References 10 publications

Numerical Study of Fin-and-Tube Heat Exchanger in Low-Pressure Environment: Air-Side Heat Transfer and Frictional Performance, Entropy Generation Analysis, and Model Development

Numerical Study of Fin-and-Tube Heat Exchanger in Low-Pressure Environment: Air-Side Heat Transfer and Frictional Performance, Entropy Generation Analysis, and Model Development

Heat transfer and flow characteristics of offset fin and flat tube heat exchangers under low pressure environment

Modeling and Performance Optimization of Louvered Fin Radiators in Negative Gauge Pressure Condition

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