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Record 1 of 2124
Experiments on Suppression of Thermocapillary Oscillations in Sodium Nitrate Floating Half-Zones by High-frequency End-wall Vibrations
Author and Affiliation:
Anilkumar, A.(Vanderbilt Univ., Nashville, TN, United States)
Grugel, R. N.(NASA Marshall Space Flight Center, Huntsville, AL, United States)
Bhowmick, J.(Vanderbilt Univ., Nashville, TN, United States)
Wang, T.(Vanderbilt Univ., Nashville, TN, United States)
Abstract: Experiments to suppress thermocapillary oscillations using high-frequency vibrations were carried out in sodium nitrate floating half-zones. Such a half-zone is formed by melting one end of a vertically held sodium nitrate crystal rod in contact with a hot surface at the top. Thermocapillary convection occurs in the melt because of the temperature gradient at the free surface of the melt. In the experiments, when thermocapillary oscillations occurred, the bottom end of the crystal rod was vibrated at a high frequency to generate a streaming flow in a direction opposite to that of the thermocapillary convection. It is observed that, by generating a sufficiently strong streaming flow, the thermocapillary flow can be offset enough such that the associated thermocapillary oscillations can be quenched.
Publication Date: Jan 01, 2004
Document ID:
20040085946
(Acquired Aug 24, 2004)
Subject Category: FLUID MECHANICS AND THERMODYNAMICS
Document Type: Preprint
Financial Sponsor: NASA Marshall Space Flight Center; Huntsville, AL, United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: CAPILLARY FLOW; HIGH FREQUENCIES; SODIUM NITRATES; THERMOCAPILLARY MIGRATION; VIBRATION; FLOAT ZONES; HOT SURFACES; OSCILLATIONS
Availability Source: Other Sources
Availability Notes: Abstract Only
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