Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
VOID FRACTION MEASUREMENT IN STRATIFIED FLOW USING CONFOCAL CHROMATIC TECHNIQUE
Submission Author:
Fernando Neves Quintino dos Santos , SP , Brazil
Co-Authors:
Fernando Neves Quintino dos Santos, Cristiano Tibiriçá
Presenter: Fernando Neves Quintino dos Santos
doi://10.26678/ABCM.ENCIT2020.CIT20-0582
Abstract
Cross-sectional void fraction is an important parameter in two-phase flow. The most common way to measure it is through the volumetric void fraction, using quick-closing valves. Although common, this method has drawbacks. Other methods exists, with varying degree of success and applicability. In this paper, a novel method to estimate the void fraction is proposed, using a confocal chromatic sensor. The method was validated with new experimental data of horizontal air-water stratified-flow. Experimental conditions ranged from jl = 0.0550 - 0.1307 m/s and jg = 0.1250 m/s. The channel is squared with side of 12 mm and made of aluminum. Experimental trends were consistent. Eleven correlations were tested and most under-predicted the data. Lockhart and Martinelli (1949) performed best with MRD of -0.036.
Keywords
void fraction, confocal chromatic, Two-phase Flow, air-water
DOWNLOAD PDF VIEW PRESENTATION
