The Code Development for the Thermo-Hydrodynamic Characteristics Study of Reflood Phase

2014 ◽  
Author(s):  
Shipeng Niu ◽  
Yapei Zhang ◽  
Wenxi Tian ◽  
Suizheng Qiu ◽  
Guanghui Su
Keyword(s):  
Heat Transfer ◽  
Fuel Element ◽  
Theoretical Basis ◽  
Hydrodynamic Characteristics ◽  
Hydraulic Analysis ◽  
Analysis Model ◽  
Heat Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
System Pressure ◽  
Calculation Results

An thermo-hydraulic analysis model for the reflood phase was established in the paper, based on the flow and heat transfer characteristics of the reflood. A code based on the model was developed for the thermo-hydraulic analysis of reflood. By comparing and analyzing the calculation results with the experimental results, the influences of the system pressure and the subcooling of coolant on reflood phase were studied. The study also provided theoretical basis for safety analysis of fuel element of reflood phase.

scholarly journals Sensitivity Analysis of Influencing Factors of Supercritical Methane Flow and Heat Transfer in a U-Tube

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5714
Author(s):  
Lingbo Zhu ◽  
Yiping Lu ◽  
Jianfei Tong ◽  
Tianjiao Liang ◽  
Youlian Lu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Process ◽  
Radius Of Curvature ◽  
Straight Tube ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Gasification Process ◽  
Flow And Heat Transfer ◽  
Calculation Results ◽  
Gravity Acceleration

Due to the existence of a Dean vortex in a U-tube, the flow and heat transfer process of supercritical methane is complex, and its thermophysical property are greatly influenced by different factors. Based on computational fluid dynamics theory, the numerical simulation of the turbulent flow and heat transfer characteristics of supercritical methane in a U-tube with an inner diameter of 10 mm and a radius of curvature of 27 mm carried out by using the finite volume method. On the basis of verifying the reliability of the model, the influences of inlet mass flux (G), heat flux on the tube wall boundary (q), pressure on the outlet (P), and gravity acceleration factors (g) on heat transfer characteristics were analyzed. The calculation results show that the sensitivity of the effects of G, q, P, and g on the heat transfer coefficient is, from large to small, in the order of P, G, g, and q. Compared with a horizontal straight tube, a U-tube can significantly improve heat transfer in the elbow part, but the presence of the elbow reduces heat transfer in the subsequent straight pipe section. The research in this paper has significance as a reference for the construction of the LNG gasification process.

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