Heat transfer in porous media with fluid phase changes
Abstract
A onedimensional experimental apparatus was built to study the heat pipe phenomenon. Basically, it consists of a 25 cm long, 2.5 cm I.D. Lexane tube packed with Ottawa sand. The two ends of the tube were subjected to different temperatures, i.e., one above the boiling temperature and the other below. The tube was well insulated so that a uniform onedimensional heat flux could pass through the sand pack. Presence of the heat pipe phenomenon was confirmed by the temperature and saturation profiles of the sand pack at the final steady state condition. A onedimensional steady state theory to describe the experiment was developed which shows the functional dependence of the heat pipe phenomenon on liquid saturation gradient, capillary pressure, permeability, fluid viscosity, latent heat, heat flux and gravity. Influence of the heat pipe phenomenon on wellbore heat losses was studied by use of a twophase twodimensional cylindrical coordinate computer model.
 Publication:

Ph.D. Thesis
 Pub Date:
 June 1981
 Bibcode:
 1981PhDT.......111S
 Keywords:

 Heat Pipes;
 Heat Transfer;
 Phase Transformations;
 Sands;
 Thermal Conductivity;
 Vapor Pressure;
 Computer Programs;
 Differential Equations;
 Finite Difference Theory;
 Heat Flux;
 Latent Heat;
 Mathematical Models;
 Permeability;
 Steady State;
 Temperature Gradients;
 Viscosity;
 Fluid Mechanics and Heat Transfer