Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
3D numerical simulations of Rayleigh-Taylor instability
Submission Author:
Bernardo Alan Duarte , MG
Co-Authors:
Aristeu Silveira Neto, Bernardo Alan Duarte
Presenter: Bernardo Alan Duarte
doi://10.26678/ABCM.COBEM2017.COB17-6909
Abstract
Rayleigh-Taylor instability occurs when a heavy fluid initially lies above a lighter one in a gravitational field. Film boiling on a horizontal surface is a typical example of the Rayleigh-Taylor instability in which during film boiling, phase changes takes place at the interface. Initially, the vapor is in equilibrium with the liquid at the interface, and the direction of heat transfer is from the vapor side to the liquid side. Numerical simulations of film boiling were performed using uniform grids and adaptive mesh refinement (AMR). Flow visualization revealed the formation of Rayleigh-taylor instability with its two coherent structures, namely, bubbles and spikes. Thermal transfer rate at the heated bottom wall was evaluated by mean Nusselt number and compared to an experimental correlation in literature.
Keywords
Nusselt number, thermal transfer, AMR, CFD.
