Numerical Study on Subcooled Pool Boiling

Abstract

This study focuses on the clarification of the heat transfer characteristics of the subcooled pool boiling, the discussion on its mechanism, and the establishment of a boiling and condensation model for direct numerical simulation on the subcooled pool boiling phenomena. In this paper, three dimensional numerical simulations based on the MARS (Multi-interface Advection and Reconstruction Solver) with a boiling and condensation model which consisted of the improved phase-change model and the relaxation time based on the quasi-thermal equilibrium state have been conducted for the bubble growth process in the subcooled pool boiling. The numerical results regarding the bubble growth process of the subcooled pool boiling show in good agreement with the experimental observation results and the existing analytical equations among Rayleigh, Plesset and Zwick and Mikic et al. Therefore, it was found that the improved boiling and condensation model with the relaxation time consideration can predict the bubble growth process of the subcooled pool boiling phenomena.

Brief Review of Latest Direct Numerical Simulation on Pool and Film Boiling

“…Recently, Hardt and Wondra [71] proposed a method for implementing phase change in a VOF or LS approach and performed simulations of film boiling and droplet evaporation using a VOF method. Kunugi [72] conducted the subcooled pool and flow boiling problem by MARS and Ose and Kunugi [73,74] conducted the subcooled pool boiling simulation and validated the numerical results by their visualization experimental data aided by the ultra-high tempo-spatial resolution video camera system [75]. Some recent works on boiling simulation based on the VOF methods have been reported [76~79] and results using the commercial code have also been reported [80,81,82].…”

Study of the Effect of the Porous Plates on the Tank Bottom on the Boiling Process

“…So, the coefficient of 1 can be ignored. By neglecting convection-diffusion acceleration, the porous media model is simplified by Darcy law [15]:…”

Heat transfer crisis in the capillary-porous cooling system of elements of heat and power installations

“…Jamialahmadi et al [12] carry out a comparative analysis of methods of heat transfer computation for water boiling with underheating in vertical channels, wherein they count focal corrosion of fuel-element cladding of fission reactor as analogy of capillary-porous structure [13,14]. However, no studies of heat transfer through a regular structured surface have been carried out.…”

“…Evaluation of the heat exchange intensity for boiling of liquid for large volume and thin films on a smooth surface showed their equal possibilities [12][13][14] at high heat flows and higher heat transfer parameters than systems with a capillary-porous coating [15,16]. It is required to carry out studies of heat transfer capabilities of coatings operating in the field of capillary and mass forces, and to establish the values of critical loads leading to overburning of heat exchange heating surfaces.…”