NDLI: Current status of liquid sheet radiator research

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Current status of liquid sheet radiator research

Content Provider	NASA Technical Reports Server (NTRS)
Author	McMaster, Matthew S. Calfo, Frederick D. Chubb, Donald L.
Copyright Year	1993
Description	Initial research on the external flow, low mass liquid sheet radiator (LSR), has been concentrated on understanding its fluid mechanics. The surface tension forces acting at the edges of the sheet produce a triangular planform for the radiating surface of width, W, and length, L. It has been experimentally verified that (exp L)/W agrees with the theoretical result, L/W = (We/8)exp 1/2, where We is the Weber number. Instability can cause holes to form in regions of large curvature such as where the edge cylinders join the sheet of thickness, tau. The W/tau limit that will cause hole formation with subsequent destruction of the sheet has yet to be reached experimentally. Although experimental measurements of sheet emissivity have not yet been performed because of limited program scope, calculations of the emissivity and sheet lifetime is determined by evaporation losses were made for two silicon based oils; Dow Corning 705 and Me(sub 2). Emissivities greater than 0.75 are calculated for tau greater than or equal to 200 microns for both oils. Lifetimes for Me(sub 2) are much longer than lifetimes for 705. Therefore, Me(sub 2) is the more attractive working fluid for higher temperatures (T greater than or equal to 400 K).
File Size	711498
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930004962
Archival Resource Key	ark:/13960/t3dz55f75
Language	English
Publisher Date	1993-01-01
Access Restriction	Open
Subject Keyword	Fluid Mechanics And Heat Transfer Fluid Mechanics Emissivity Oils Spacecraft Radiators Interfacial Tension Working Fluids Liquid Flow Silicon Evaporation Research and Development Sheets Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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