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An improved algorithm for the modeling of vapor flow in heat pipesA heat pipe vapor flow algorithm suitable for use in codes on microcomputers is presented. The incompressible heat pipe vapor flow studies of Busse are extended to incorporate compressibility effects. The Busse velocity profile factor is treated as a function of temperature and pressure. The assumption of a uniform saturated vapor temperature determined by the local pressure at each cross section of the pipe is not made. Instead, a mean vapor temperature, defined by an energy integral, is determined in the course of the solution in addition to the pressure, saturation temperature at the wall, and the Busse velocity profile factor. For alkali metal working fluids, local species equilibrium is assumed. Temperature and pressure profiles are presented for several cases involving sodium heat pipes. An example for a heat pipe with an adiabatic section and two evaporators in sequence illustrates the ability to handle axially varying heat input. A sonic limit plot for a short evaporator falls between curves for the Busse and Levy inviscid sonic limits.
Document ID
19900004432
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Tower, Leonard K. (Sverdrup Technology, Inc. Cleveland, OH, United States)
Hainley, Donald C. (Sverdrup Technology, Inc. Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1989
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.26:185179
NASA-CR-185179
E-5195
Meeting Information
Meeting: International Heat Pipe Conference
Location: Minsk
Country: USSR
Start Date: May 21, 1990
End Date: May 25, 1990
Sponsors: Luikov Heat and Mass Transfer Inst.
Accession Number
90N13748
Funding Number(s)
CONTRACT_GRANT: NAS3-25266
PROJECT: RTOP 586-01-21
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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