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Thermal Performance of an Aluminum/Ammonia Heat Pipe Under Reflux ModeDuring instrument-level or spacecraft-level ground testing, heat pipes may be placed in reflux mode, with condenser above evaporator. A liquid pool will form at the bottom of the heat pipe. If heat is applied to a site below the surface of the liquid pool in a vertical heat pipe, the heat pipe can work properly under reflux mode. A superheat is required for startup. If heat is applied to a site above the liquid pool, the heat pipe is not expected to work unless additional heat is applied to the liquid pool to provide the needed flow circulation. There are many reason to minimize the additional heater power. An experimental investigation was conducted to study the heat pipe behavior under this configuration.
Document ID
20190001939
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Ku, Jentung (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
March 28, 2019
Publication Date
March 26, 2019
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
GSFC-E-DAA-TN66142
Meeting Information
Meeting: Spacecraft Thermal Control Workshop
Location: Torrance, CA
Country: United States
Start Date: March 26, 2019
End Date: March 28, 2019
Sponsors: Aerospace Corp.
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
Thermal control systems
Heat pipes

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