Numerical thermal simulation of cryoexposure using Ansys

Abstract

The current advances and problems of medical cryoexposure thermal simulation are considered. Recommendations on improving geometric models, thermophysical properties, boundary conditions, and for parameterizing of the computational domain are proposed. These recommendations can be applied to most modern FEA software packages (tested in Ansys CFX 19.2). Examples of cryoablation and cryotherapy simulation are presented.

Radiation heat transfer between human and cryocabin walls

“…In cryosaunas, where the cooling process occurs due to supply of liquid nitrogen, the air temperature can reach 77-78 K, the wall temperature can reach 120-140 K, while the human temperature is higher than 273.15 K. The system consisting of human and walls of the cryosauna is characterized by radiation-convective heat transfer. This is one of the most difficult cases of heat transfer when the equations of radiant energy transfer are solved together with the equations of motion and convective heat transfer [1][2][3][4][5][6][7]. The problem of radiation-convective heat transfer cannot be solved analytically, while for a numerical solution, it is necessary to make several assumptions.…”