Numerical study of non-stationary heat and mass transfer in cryogenic long-term storage tank with movable phase boundary

About the author:

Abstract:

This article deals with numerical methods for studying the process of unsteady heat and mass transfer in a tank during long-term storage of cryogenic liquids. Along with the absence of a universal turbulence model to date, the author notes the prospects of using the Reynolds-averaged method RANS and the semi-empirical turbulence models used to close the system of equations, due to the acceptable requirements for computing resources. This paper presents the model for calculating thermophysical properties of cryogenic products, taking into account the movement of the phase boundary liquid-vapor inside the vessel. In addition, the author compared two-parameter semiempirical turbulence models applied to the solution of the problem in terms of a) the duration of the calculation, b) the requirements for computing resources, and c) the accuracy of the results.

Based on experimental data on the parameters of the temperature field in the vapor space of the reservoir with liquefied natural gas, the author verified the proposed model for each of the analyzed turbulence models. Based on the simulation results, he concludes that it is possible and expedient to carry out a numerical study (instead of an expensive experimental one) for calculating the thermophysical parameters for long-term storage, including the assessment of the value of the movement of the phase boundary.

References:

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