This paper discusses the two-phase flow pattern in the loop
heat pipe with R-134a. A computational fluid dynamics (CFD)
study was carried out using ANSYS FLUENT. VOF model was
used to simulate interface between vapor and liquid phase of R-
134a. A UDF was used to model evaporation and condensation
mass transfer between two phases. For the simulation of increase
of pressure in the loop heat pipe, the ideal gas law was
considered when modelling the density of vapor. The
numerically calculated temperatures in this paper and Fadhl’s
calculated temperatures and experimentally measured
temperatures matched very well . The maximum difference
between the calculated and Fadhl’s temperature data is 2.4 %.
The bubble figure in the loop heat was observed with time passed
in this paper.
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .