EPTT 2022

13th Spring School on Transition and Turbulence

Experimental determination of void fraction is air-water flows using chromatic confocal microscopy

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.EPTT2022.EPT22-0085

 

Abstract

Two-phase flows have use in several fields, including refrigeration and oil and gas industries. In design of heat exchangers or pipe design, parameters such as pressure drop gradient and heat transfer are very important. Such quantities depend on the operative conditions, such as mass flow, temperature, fluids, and others. Some parameters, as void fraction, are also very important, but not so easily modelled, thus experimental results are necessary to devise new experimental correlations. In this paper, new void fraction experimental results will be obtained, for horizontal air-water flows, in rectangular test sections of 5 × 6.4mm2 and 12 × 12mm2. The void fraction will be measured using the confocal chromatic microscopy, which is a novel technique that allows for local, precise thickness measurements in transparent mediums, used mostly in health sciences. Results are compared with empirical correlations, to good agreement.

Keywords

Two-phase Flow, void fraction, air-water, confocal chromatic microscopy

 

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