Publicado 8 números por año
ISSN Imprimir: 1065-5131
ISSN En Línea: 1563-5074
Indexed in
OPTIMIZATION STUDY OF ARTIFICIAL CAVITIES ON SUBCOOLED FLOW BOILING PERFORMANCE OF WATER IN A HORIZONTAL SIMULATED ENGINE COOLING PASSAGE
SINOPSIS
The surface morphology of engine cooling passage plays an essential role in heat transfer; particularly, the mechanism for its enhanced effect on boiling heat transfer is still not fully understood. Thus in this paper, the volume of fluid (VOF) model was developed to simulate the subcooled flow boiling on the heating surface with different cavity configurations in a horizontal simulated cooling passage under engine-like conditions. The calculated results of heat flux of the heating surface with artificial cylindrical cavities were found to be larger than those of the plain surface. The void fraction and velocity distributions in the cavities were depicted to explore the enhancement mechanism of the heat transfer. The approximation model of the heat flux with the average error of 4.5% and R2 of 0.963 was established by using response surface methodology. The effects of geometric parameters (such as cavity spacing, cavity diameter, and cavity depth) on the heat flux were quantitatively discussed. The results show that the cavity depth has the most significant effect on transferred heat flux in comparison with other design variables. Finally, the optimal structural design and arrangement of artificial cavities were acquired using the Adaptive Simulated Annealing (ASA) algorithm. The heat flux with the optimized cavities was approximately 24% higher than that of the original plain heating surface.
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