TY - JOUR
T1 - Radiative and evaporative characteristics analysis of a liquid droplet layer for space applications
AU - Qin, Hao
AU - Wang, Chenglong
AU - Zhang, Dalin
AU - Tian, Wenxi
AU - Su, G. H.
AU - Qiu, Suizheng
N1 - Publisher Copyright:
© 2019 Elsevier Masson SAS
PY - 2019/12
Y1 - 2019/12
N2 - Liquid droplet radiator is promised to be used for waste heat dissipation of the large power space nuclear reactor. This paper analyzes the radiative heat transfer and evaporative characteristics by treating the droplet layer as a participating medium. The silicon oil is adopted as the working fluid. The mathematical models are established. The effects of the optical thickness κD, initial temperature, and flight time on the droplet radiation and evaporation are investigated. The main works are listed as follows: Firstly, the grid independence analysis of the temperature calculation is conducted, and the grid number on the thickness direction is suggested to be 100 times of κD. Secondly, the calculation results obtained from the one dimensional (1-D) simplified formula and the two dimensional (2-D) simulation have been compared, proving that it is acceptable to obtain the average temperature by 1-D simulation for droplet layers with any κD. Thirdly, detailed temperature distribution is calculated for both thin and thick droplet layers, and higher initial temperature and longer flight time can enhance the radiative heat transfer. Finally, the evaporative loss rate of the working fluid is found to be nearly constant with κD larger than 4. This paper may contribute to the thermal design and optimization of the liquid droplet radiator for space applications.
AB - Liquid droplet radiator is promised to be used for waste heat dissipation of the large power space nuclear reactor. This paper analyzes the radiative heat transfer and evaporative characteristics by treating the droplet layer as a participating medium. The silicon oil is adopted as the working fluid. The mathematical models are established. The effects of the optical thickness κD, initial temperature, and flight time on the droplet radiation and evaporation are investigated. The main works are listed as follows: Firstly, the grid independence analysis of the temperature calculation is conducted, and the grid number on the thickness direction is suggested to be 100 times of κD. Secondly, the calculation results obtained from the one dimensional (1-D) simplified formula and the two dimensional (2-D) simulation have been compared, proving that it is acceptable to obtain the average temperature by 1-D simulation for droplet layers with any κD. Thirdly, detailed temperature distribution is calculated for both thin and thick droplet layers, and higher initial temperature and longer flight time can enhance the radiative heat transfer. Finally, the evaporative loss rate of the working fluid is found to be nearly constant with κD larger than 4. This paper may contribute to the thermal design and optimization of the liquid droplet radiator for space applications.
KW - Evaporative loss
KW - Liquid droplet radiator
KW - Radiative heat transfer
KW - Space nuclear reactor
UR - https://www.scopus.com/pages/publications/85072855473
U2 - 10.1016/j.ast.2019.105434
DO - 10.1016/j.ast.2019.105434
M3 - 文章
AN - SCOPUS:85072855473
SN - 1270-9638
VL - 95
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 105434
ER -