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Thermal Capacitance (Slug) Calorimeter Theory Including Heat Losses and Other Decaying ProcessesA mathematical model, termed the Slug Loss Model, has been developed for describing thermal capacitance (slug) calorimeter behavior when heat losses and other decaying processes are not negligible. This model results in the temperature time slope taking the mathematical form of exponential decay. When data is found to fit well to this model, it allows a heat flux value to be calculated that corrects for the losses and may be a better estimate of the cold wall fully catalytic heat flux, as is desired in arc jet testing. The model was applied to the data from a copper slug calorimeter inserted during a particularly severe high heating rate arc jet run to illustrate its use. The Slug Loss Model gave a cold wall heat flux 15% higher than the value of 2,250 W/sq cm obtained from the conventional approach to processing the data (where no correction is made for losses). For comparison, a Finite Element Analysis (FEA) model was created and applied to the same data, where conduction heat losses from the slug were simulated. The heat flux determined by the FEA model was found to be in close agreement with the heat flux determined by the Slug Loss Model.
Document ID
20090008662
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Hightower, T. Mark (NASA Ames Research Center Moffett Field, CA, United States)
Olivares, Ricardo A. (NASA Ames Research Center Moffett Field, CA, United States)
Philippidis, Daniel (San Jose State Univ. San Jose, CA, United States)
Date Acquired
August 24, 2013
Publication Date
September 1, 2008
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
TFAWS 08-1001
NASA/TM-2008-215364
A-080019
Meeting Information
Meeting: Thermal and Fluids Analysis Workshop (TFAWS) 2008
Location: San Jose, CA
Country: United States
Start Date: August 18, 2008
End Date: August 22, 2008
Sponsors: San Jose State Univ., NASA Ames Research Center
Distribution Limits
Public
Copyright
Public Use Permitted.

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