Direct numerical simulation of nucleate pool boiling using a two-dimensional lattice Boltzmann method

The free energy based multiphase lattice Boltzmann method was used to directly simulate nucleate pool boiling. The interface capturing and energy equations with a phase change model were implemented into the isothermal lattice Boltzmann method. In order to validate the method, a bubble growth in a superheated liquid was simulated and compared to analytical solutions. Bubble departure diameter is dependent on gravity force, surface tension, contact angle, and wall superheat. Varying these parameters, numerical simulations were executed and the results were found to be in good agreement with the previous correlations. For a single nucleation site, the bubble growth on and departure from a superheated wall were simulated successfully. The vapor bubble shape and temperature fields were then compared to the experimental measurements. Also, for multiple nucleation sites, simulations were performed and their subsequent results are presented. The heat transfer rates of these simulations were calculated and compared to the empirical correlations for the nucleate pool boiling. Consequently, the multiphase lattice Boltzmann method with a phase change model is feasible for the direct numerical simulation of nucleate pool boiling. (C) 2012 Elsevier B.V. All rights reserved.