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121 results on '"Cheng, Yongpan"'

9. Theoretical Analysis on the Lifetime of Sessile Droplet Evaporation

Author

Shen, Yang, Cheng, Yongpan, Xu, Jinliang, Zhang, Kai, Ceccarelli, Marco, Series Editor, Hernandez, Alfonso, Editorial Board Member, Huang, Tian, Editorial Board Member, Takeda, Yukio, Editorial Board Member, Corves, Burkhard, Editorial Board Member, Agrawal, Sunil, Editorial Board Member, Okada, Hiroshi, editor, and Atluri, Satya N., editor

Published
2020
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19. Numerical simulation and structural optimization of LYHZ type quench box.

Author

Chen Chao, Chen Qiang, Sheng Weiwu, Li Xiaoting, and Cheng Yongpan

Subjects
STRUCTURAL optimization, COMPUTER simulation, PRESSURE drop (Fluid dynamics), HEAT transfer, NANOFLUIDICS
Abstract

In order to adapt to the trend of large-scale hydrogenation reactor, the LYZH type quench box which integrates the functions such as swirl, impact and baffle splitter has been developed. Its structure from top to bottom is swirl cold hydrogen tube, cold hydrogen disk, jet tube and liquid receiving disk. A numerical simulation is carried out on the LYZH type quench box using CFD software, and the results show that the quench box has excellent heat transfer performance and gas-liquid mixing performance. In order to further improve the performance of the LYZH type quench box, its structure is optimized. The best optimal structure is the swirl cold hydrogen tube with a diameter of 2,218.9 mm, jet pipe with a diameter of 526.9 mm, and the height from the liquid receiving disk to cold hydrogen disk of 175.4 mm. Compared with the original structure, the heat transfer performance of the optimal structure is increased by 7.61%, the pressure drop is reduced by 14.4%, and the comprehensive performance of the LYZH type quench box is greatly improved. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Numerical prediction of breakup mode of contracting gas filament in liquid.

Author

Ma, Yang, Cheng, Yongpan, Zhang, Dongjie, Zhang, Ke, and Wang, Fan

Subjects
LIQUEFIED gases, CAPILLARY waves, LEVEL set methods, GAS dynamics, VISCOSITY
Abstract

The breaking up of gas filament in liquid is important in many industrial and scientific applications. In this study, a transient axisymmetric model with the level set method is built up to examine the dynamics of a contracting gas filament, and to determine the effects of the aspect ratio, Ohnesorge (Oh) number, and viscosity ratio on its breakup mode. The filament undergoes no break, middle break, or end‐pinching modes with increasing aspect ratio at either a low or a high Oh number, and one critical initial aspect ratio is observed for each Oh number. The fate of the filament is determined by the interaction of capillary waves on its surface, and can be predicted accurately by using the one‐dimensional wave superposition method. The decreasing viscosity ratio of liquid over gas reduces the critical initial aspect ratio for the fate transition between the no break and breakup modes, and this effect is reduced at a low viscosity ratio. These findings may be helpful in fabricating gas bubbles and their breakup suppression. [ABSTRACT FROM AUTHOR]

Published
2022
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