Pressure distribution and flow characteristics of closed oscillating heat pipe during the starting process at different vacuum degrees

摘要

This work is focused on the distribution and fluctuation of pressure, vapor flow patterns, and the relationship between them during the starting process at different vacuum degrees of closed oscillating heat pipe (COHP). A two-dimensional model of the closed oscillating heat pipe was established, and the VOF (volume of fluid) model was taken as the solution to carry out the numerical simulation of liquid-vapor during the two-phase conversion. The relationships of pressure distribution and vapor flow patterns were analyzed and a series of visualization experimental results were used to compare with simulation ones. It shows that both of them are highly consistent. The laws obtained from start-up analysis and contrast of simulation and experiment are beneficial to research the oscillating heat pipe in the future. (C) 2015 Elsevier Ltd. All rights reserved.