Modeling the use of a binary mixture as a control scheme for two-phase thermal systemsTwo-phase thermal loops using mechanical pumps, capillary pumps, or a combination of the two have been chosen as the main heat transfer systems for the space station. For these systems to operate optimally, the flow rate in the loop should be controlled in response to the vapor/liquid ratio leaving the evaporator. By substituting a mixture of two non-azeotropic fluids in place of the single fluid normally used in these systems, it may be possible to monitor the temperature of the exiting vapor and determine the vapor/liquid ratio. The flow rate would then be adjusted to maximize the load capability with minimum energy input. A FLUINT model was developed to study the system dynamics of a hybrid capillary pumped loop using this type of control and was found to be stable under all the test conditions.
Document ID
19910054159
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Benner, S. M. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Costello, Frederick A. (Frederick A. Costello, Inc. Herndon, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Fluid Mechanics And Heat Transfer
Meeting Information
Meeting: AIAA/ASME Thermophysics and Heat Transfer Conference