Numerical investigation of the thermal stratification in cryogenic tanks subjected to wall heat flux
Abstract
The flow pattern and thermal stratification of a cryogenic cylindrical tank are numerically studied. The tank sidewall is subjected to either a uniform heatflux or two discrete levels of uniform heatflux at the upper and lower halves of the tank wall. The tank bottom is kept at a constant temperature controlled by the heat exchanger of a thermodynamic vent system. The tank pressure is also assumed constant resulting in a constant saturation temperature at the interface which is higher than the tank bottom temperature. The effects of vapor motion and vapor superheat on the mass and heat transfer processes at the interface are assumed negligible such that the calculations of liquid region can be decoupled from the vapor region. Dimensionless steadystate conservation equations are solved by a finitedifference method. The effects of modified Rayleigh number, Prandtl number, tank aspect ratio, wall heatflux parameter, and wall heatflux distribution on the liquid velocity and temperature fields are investigated. Also, their effects on the rate of heat transfer through the interface and the tank bottom are examined.
 Publication:

AIAA, SAE, ASME, and ASEE, 26th Joint Propulsion Conference
 Pub Date:
 July 1990
 Bibcode:
 1990jpof.confQQ...L
 Keywords:

 Cryogenic Fluid Storage;
 Cylindrical Tanks;
 Flow Distribution;
 Heat Exchangers;
 Heat Flux;
 Heat Transfer;
 Storage Tanks;
 Stratification;
 Temperature Distribution;
 Thermodynamics;
 Wall Flow;
 Aspect Ratio;
 Conservation Equations;
 Dimensionless Numbers;
 Finite Difference Theory;
 Mass Transfer;
 Prandtl Number;
 Rayleigh Number;
 Steady State;
 Vapors;
 Velocity Distribution;
 Vents;
 Fluid Mechanics and Heat Transfer