Numerical Analysis for the Air-Side Convective Heat Transfer Characteristics in a Compact Heat Exchanger with Flat Tubes and Plate Fins According to the Aspect Ratio

2008 ◽  
Vol 32 (9) ◽  
pp. 695-703 ◽  
Author(s):  
Jeong-Hah Moh
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Numerical Analysis ◽  
Aspect Ratio ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Compact Heat Exchanger ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flat Tubes

Numerical Analysis of Heat Transfer Characteristics for Supercritical Aviation Kerosene

2015 ◽  
Author(s):  
Yachao Song ◽  
Danjiao Ma ◽  
Jingzhi Zhang ◽  
Jing-xiang Chen ◽  
Songze Chen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Analysis ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Convective Heat Transfer Coefficient ◽  
Experimental Result ◽  
Heating Process ◽  
Heat Transfer Characteristics ◽  
Aviation Kerosene ◽  
Transfer Characteristics

With the physical property changing dramatically, the supercritical aviation kerosene obtains unique heat transfer characteristics. In this way, it is difficult to investigate the heat transfer characteristics by normal experiment and therefore we resort to numerical analysis to address the scientific questions in this study. The project is proposed to demystify the heat transfer characteristics of supercritical aviation kerosene with CFD in 4mm inside diameter vertical circular tubes. Under the conditions of different pressures (3.5MPa-5MPa), the physical properties of the fluid are expressed in linear poly-nominal fitting including density, isobaric specific heat, thermal conductivity and viscosity. With the guidance of CFD, we analyze how the heat transfer characteristics can be affected by the value of temperature, pressure, heat flux mass velocity and so on. The result indicates: (1) In primary heating process, convective heat transfer is enhanced significantly. (2) When wall temperature surpasses the critical temperature, heat transfer can be deteriorated. (3) When the temperature continues to go up, the convective heat transfer coefficient will rise greatly again. Furthermore, the project has also compared the numerical analysis result with experimental result, which shows good agreement with each other. Hence, the validation of numerical analysis of supercritical fluid is well recognized.

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