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Marion BEAUMALE’s Thesis Defense

par Laurence Laffont - publié le

Marion BEAUMALE’s thesis defense, intitled "Condensation convective : de l’analyse locale à l’établissement de lois de dimensionnement" (Convective Condensation : from Local Analysis to the Foundation of Dimensioning Laws), will be taking place on wednesday, July 13th at 10:00 at UPS - Amphithéatre Concorde (bât U4).

The thesis work has been realized within groupGREPHE.

Link to visio :

Jury :

Catherine COLIN, Professor at l’ENSEEITH Toulouse (Reviewer)

Jean-Christophe BATSALE, Professor at ENSAM Bordeaux (Rapporteur)

Frédéric LEFEVRE, Professor at INSA de Lyon (Rapporteur)

Davide DEL COL, Professor at Padoua University (Reviewer)

Sébastien ROTTIGNI, Officer at EPSILON-ALCEN Toulouse (Guest)

Marc MISCEVIC, Senior lecturer at Université de Toulouse (Thesis supervizor)

Pascal LAVIEILLE, Senior lecturer at Université de Toulouse (Thesis supervizor))

Abstract :

The prediction of heat transfers remains today one of the main issues in the design of systems implementing film condensation at low mass velocity. Indeed, the laws available in the literature are no valid when the mass velocity is low, which means order of those on passive systems CPL or LHP. One of the particularity of this system is the strong coupling between thermal performance and the structuration of liquid and vapor phase within the flow. Condenser sizing requires an understanding of both the role of gravity and the coupling between heat transfers and two-phase flow distribution.

The aim of these works is to contribute to fill this gap to develop an experimental approach allowing to study the relation between heat transfer, mass transfer and momentum transfer within condensation flow at low mass velocity. In this way, an experimental bench has developed allowing to study the condensation of HFE-7000 at vertical downflow. The dimensions of the condenser (circular shape section with an internal diameter of 3.4 mm, an external diameter of 6 mm and a length of 1 m) allow to study the complete condensation (vapor quality ranging from 1 to 0) of the fluid for mass velocities from 5 to 30 kg/m²/s. In order to use optical measurement techniques, the condenser used is made of sapphire, a transparent and conductive material.

The originality of the experimental device that is proposed its ability to measure locally and simultaneously the liquid film thickness and the heat transfer coefficient. Due to the cooling method used (i.e. forced air conditioner) the determination of the heat transfer coefficient requires an extreme precision of the wall temperature measurement, which is difficult to achieve with usual tools. The metrology implemented combines two high-precision measurement techniques allowing the local and simultaneous measurement of the wall temperature of the condenser by infrared method and the liquid film thickness flowing on the wall tube by with light interferometric method or chromatic confocal. At the same time, the experimental tests conducted within the ENCOM-3 project during the 70th ESA parabolic flights campaign used to highlight the gravity effect.