The melting interface geometries present within cylindrical iron rods in microgravity are examined. Melting samples are quenched in microgravity by immersion in a water bath. Samples are sectioned on multiple planes and photo microscopy analysis is used to determine the shape of the melting interface on each plane. Images from multiple cross-sections are assembled to produce a three-dimensional representation of the melting interface present in microgravity. Iron rods are shown to have an asymmetric, convex melting interface in microgravity, with a significantly different (increased) heat transfer area compared to the planar normal-gravity case. The change in surface area of the melting interface between normal gravity and microgravity is shown to provide excellent agreement with the observed change in melting rate, as predicted by simple one-dimensional heat transfer analysis.
Les formes d'interface de fusion présentes dans les barreaux cylindriques d'acier en microgravité sont examinées. Des échantillons fondus sont refroidis en microgravité par immersion dans un bain d'eau. Les échantillons sont sectionnés en de multiples plans et l'analyse de photo de microscopie est employée pour déterminer la forme du front de fusion dans chaque plan. Des images des sections transversales multiples sont assemblées pour produire une représentation tridimensionnelle de l'interface de fusion en microgravité. Il est trouvé que des tiges de fer conduisent à une interface de fusion asymétrique et convexe en microgravité, avec une surface de transfert thermique accrue par comparaison au cas plan en pesanteur normale. Le changement de la superficie de l'interface de fusion entre la pesanteur normale et la microgravité est en excellent accord avec le changement prédit par une analyse unidimensionnelle simple du transfert thermique.
Mot clés : Mécanique des fluides, Interface de fusion, Taux de fusion, Métaux combustibles, Microgravité, Topologie de la surface de fusion
Nicolas R. Ward 1; Ted A. Steinberg 1
@article{CRMECA_2007__335_5-6_342_0,
author = {Nicolas R. Ward and Ted A. Steinberg},
title = {Geometry of the melting interface in cylindrical metal rods under microgravity conditions},
journal = {Comptes Rendus. M\'ecanique},
pages = {342--350},
publisher = {Elsevier},
volume = {335},
number = {5-6},
year = {2007},
doi = {10.1016/j.crme.2007.05.008},
language = {en},
}
TY - JOUR AU - Nicolas R. Ward AU - Ted A. Steinberg TI - Geometry of the melting interface in cylindrical metal rods under microgravity conditions JO - Comptes Rendus. Mécanique PY - 2007 SP - 342 EP - 350 VL - 335 IS - 5-6 PB - Elsevier DO - 10.1016/j.crme.2007.05.008 LA - en ID - CRMECA_2007__335_5-6_342_0 ER -
Nicolas R. Ward; Ted A. Steinberg. Geometry of the melting interface in cylindrical metal rods under microgravity conditions. Comptes Rendus. Mécanique, Volume 335 (2007) no. 5-6, pp. 342-350. doi : 10.1016/j.crme.2007.05.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2007.05.008/
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