Solidification dynamics of spherical drops in a free fall environment View Full Text


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Article Info

DATE

2007-06

AUTHORS

Richard N. Grugel, Lucien N. Brush

ABSTRACT

Silver drops (99.9%, 4, 5, 7, and 9 mm diameter) were levitated, melted, and released to fall through Marshall Space Flight Center’s 105 meter drop tube in helium −6% hydrogen and pure argon atmospheres. By varying a drop’s initial superheat the extent of solidification prior to impact ranged from complete to none during the ∼4.6 seconds of free fall time. Comparison of the experimental observations is made with numerical solutions to a model of the heat transfer and solidification kinetics associated with cooling of the drop during free fall, particularly with regard to the fraction of liquid transformed. Analysis reveals the relative importance of the initial parameters affecting the cooling and solidification rates within the drop. A discussion of the conditions under which the actual observations deviate from the assumptions used in the model is presented. More... »

PAGES

32

References to SciGraph publications

  • 1986-08. Microstructures of niobium-germanium alloys processed in inert gas in the 100 meter drop tube in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1981-06. Solidification of metal spheres in METALLURGICAL AND MATERIALS TRANSACTIONS B
  • 1986. Analysis of the Free-Fall Behavior of Liquid-Metal Drops in a Gaseous Atmosphere in MRS ADVANCES
  • 1986-06. Solidification of Nb-Ge alloys in long drop tubes in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1982-02. Heat Flow during Rapid Solidification of Undercooled Metal Droplets in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1982-01. Microstructures of rapidly solidified aluminum alloy submicron powders in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1992-02. Cooling and solidification of liquid-metal drops in a gaseous atmosphere in JOURNAL OF MATERIALS SCIENCE
  • 1988-03. The evolution of microcrystalline structures in supercooled metal powders in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 1988-03. Thermal considerations on the recalescence of alloy powders in METALLURGICAL AND MATERIALS TRANSACTIONS A
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    http://dx.doi.org/10.1007/bf02911865

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