SIMULTANEOUS HEAT AND MASS TRANSFER IN UNSTEADY TURBULENT NATURAL CONVECTION. APPLICATION TO LIQUIFIED NATURAL GAS STORAGE

1994 ◽  
Author(s):  
C.T. Pham ◽  
S. Hartmann ◽  
J. P. Petit
Keyword(s):  
Mass Transfer ◽  
Natural Convection ◽  
Natural Gas ◽  
Heat And Mass Transfer ◽  
Gas Storage ◽  
Natural Gas Storage ◽  
Turbulent Natural Convection ◽  
Simultaneous Heat

scholarly journals THE IMPACT OF LIQUEFIED NATURAL GAS COMPOSITION AND TECHNOLOGICAL CHARACTERISTICS OF THE STARTING STORAGE OF THE EQUIPMENT AT THE TIME OF OCCURRENCE OF THE PHENOMENON OF ROLLOVER

2019 ◽  
Vol 46 (1) ◽  
pp. 66-78
Author(s):  
R. A. Khuramshina ◽  
A. I. Yamalov
Keyword(s):  
Mass Transfer ◽  
Natural Gas ◽  
Heat And Mass Transfer ◽  
Software Package ◽  
Gas Storage ◽  
Liquefied Natural Gas ◽  
Ansys Software ◽  
Natural Gas Storage ◽  
The Impact ◽  
Stratified Liquid

Objectives. Ways to prevent the onset of rollover in the liquefied natural gas storage.Method. The article deals with modern methods of mathematical modeling and software when solving problems in a nonlinear formulation. A regulatory analysis of existing methods of LNG transportation has been carried out.Result. Using the mathematical program ANSYS, the rollover process in the liquefied natural gas storage was modeled. In the ANSYS software package, 3d modeling of the process of heat and mass transfer of the stratified liquid in the liquefied natural gas storage was performed. When simulating a rollover phenomenon, the time to its occurrence was 30 minutes, which differs from the experimental value by 1.7%. Based on the results of the calculations, it can be determined that the time to the onset of rollover depends on the concentration of the component layers, on the filling and geometry of the reservoir. These factors lead to an increase in evaporation of liquefied natural gas of 0.04%.Conclusion. The method of numerical experiment allows to determine the distribution of pressure, temperature, density, concentration in the object under study, without resorting to real experiments. The use of the ANSYS software package of computational fluid dynamics in the process of heat and mass transfer of the stratified liquid in the liquefied natural gas storage is necessary when calculating the increased accuracy.

Numerical Study of Heat and Mass Transfer by Laminar and Turbulent Natural Convection With Cross Diffusion Effects in Square Cavity

2008 ◽  
Author(s):  
Wenguang Geng ◽  
Baoming Chen ◽  
Maocheng Tian ◽  
Fang Liu
Keyword(s):  
Mass Transfer ◽  
Natural Convection ◽  
Heat And Mass Transfer ◽  
Soret Effect ◽  
Solute Concentration ◽  
Square Cavity ◽  
Component System ◽  
Turbulent Natural Convection ◽  
Cross Diffusion ◽  
Diffusion Effects

Laminar and turbulent natural convection flow in a two-dimensional square cavity filled two component system with compensating horizontal thermal and solute concentration gradients is investigated in this paper. The temperature gradient and volatile organic compounds (VOCs) concentration gradient are kept uniform in horizontal direction, while horizontal surfaces are kept adiabatic and impermeable within a square cavity. According to the principle of irreversible thermodynamics, with thermal-diffusion (Soret) effect and diffusion-thermo (Dufour) effect, a commercial computational fluid dynamics (Fluent) code is used to simulate heat and mass transfer numerically in present work. After validation of the method with available measurements, the range of the cross diffusion coefficients are analyzed firstly. Furthermore, the thermal field and solute concentration fields are presented for various conditions. Finally, the average Nusselt number and Sherwood number at the vertical wall are presented graphically. The numerical results show that the present work would help to know about the convective diffusion and distribution of VOCs indoor environment accurately. Also, it gives the more accurate characteristics of heat and mass transfer in multi-component system with cross diffusion effects.

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