Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
Accuracy of Boiling Correlations on Nucleate Boiling with Ethanol Using a Thin Platinum Wire at Different Pressures
Submission Author:
Arthur Vieira da Silva Oliveira , SP
Co-Authors:
Rogério Gonçalves dos Santos, Guilherme Alegre
Presenter: Arthur Vieira da Silva Oliveira
doi://10.26678/ABCM.ENCIT2016.CIT2016-0666
Abstract
Nucleate boiling heat transfer has been largely studied in many research centers around the world due to its very high efficiency in cooling a hot surface. Many conditions, geometries and parameters have been studied and many correlations were proposed to predict heat transfer coefficients and wall temperature. However, the correlations are usually restricted to several conditions, for example geometry, fluid or heater material. If no restriction is applied, it usually has a function or parameter to correct the equation. In the present work, nucleate boiling experiments were performed with ethanol at 4 pressure levels from 1 bar to 6 bar, with visualization of the phenomenon. Several correlations were tested and one known correlation presented great fit. Rohsenow constants are also proposed for this experimental condition. Furthermore, pictures at several heat fluxes for each pressure are presented. It is possible to observe the pressure effect on the boiling heat transfer and the increase in bubble formation with the increase of heat flux until critical heat flux is achieved.
Keywords
Nucleate Boiling, Boiling Correlations, Pressure Effect, ethanol
