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Etude expérimentale du refroidissement diphasique à haute température par jet d'eau impactant

Abstract : This work deals with the study of boiling heat transfer at a hot plate cooled by a planar jet of water, in steady-state condition. This study is motivated by the metal processing industry who wishes to acquire knowledge in this field in order to control locally the cooling of steel strips. At the University of Berlin, an experimental device allowing the determintation of local boiling curves along a non-moving surface cooled by a planer jet of water has been buitl up. Measurements being carried out with a temperature controlled system, it is possible to identify boiling regimes from forced convection to film boiling. Local boiling curves have been measured up to a distance of 55 mm from the stagnation line, in a range of velocities from 0.5 to 1m/s and for subcoolings between 5 and 20 K. Experiments show the influence of those parameters on the different boiling regimes, for an emerged jet and for a free surface one, and correlations have been established. The effect of the distance from the stagnation line is of the most importance on the boiling curve except in the fully developped nucleate boiling regime. Measurements carried out at low temperatures are in agreement with already published results steady-stata conditions. Measurements showed the importance of the transition boiling regilme at the stagnation line. This regime extends on a high range of temperature signals shows that the beginning of the transition boiling regime and the reweeting are associated to very important fluctuations of the temperature that appear et low frequencies.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2000_0234_GABORIEAU_ROBIDOU.pdf
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Submitted on : Thursday, March 29, 2018 - 10:42:10 AM
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Herveline Gaborieau-Robidou. Etude expérimentale du refroidissement diphasique à haute température par jet d'eau impactant. Autre. Université Henri Poincaré - Nancy 1, 2000. Français. ⟨NNT : 2000NAN10234⟩. ⟨tel-01746662⟩

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