Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
NUCLEATE BOILING FLOW AT LOW PRESSURE AND VELOCITY CONDITIONS BY THE RPI BOILING MODEL
Submission Author:
Caio Carvalho , MG
Co-Authors:
Caio Carvalho, Luís Antônio Scola, Gustavo Rodrigues de Souza, Felipe Loureiro
Presenter: Gustavo Rodrigues de Souza
doi://10.26678/ABCM.COBEM2019.COB2019-1105
Abstract
The advancement of computers and CFD (Computational Fluid Dynamics) allowed a rapid development in the computational modeling of nucleated boiling, phenomenon present, for instance, in engines cooling process, reactors and in the casting process. Among the developed models to describe the boiling, the RPI model (Rensselaer Polytechnic Institute) shows to be quite general and applicable in a great deal of cases; nevertheless, the interaction between phases (liquid and vapor) makes the model sensitive to some parameters such as velocity, pressure and turbulence. In this study, subcooled boiling heat transfer in an internal flow was numerically analyzed by the Ansys Fluent® software and the RPI wall boiling model was applied to low pressure and velocity conditions. Various combinations for wall functions using the k-ε turbulence model were studied with an operating condition of velocity and pressure ranging from 0.25 to 1 m/s and from 0 to 2 bar, respectively. The numerical simulations were validated by comparing with a literature experiment. The computational results show a good agreement with the experimental data and evidenced the influence of the selected wall function for this application.
Keywords
CDF, RPI Boiling Model, Nucleated Boiling, Turbulence, Wall Function
