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Experimental results for the rapid determination of the freezing point of fuelsTwo methods for the rapid determination of the freezing point of fuels were investigated: an optical method, which detected the change in light transmission from the disappearance of solid particles in the melted fuel; and a differential thermal analysis (DTA) method, which sensed the latent heat of fusion. A laboratory apparatus was fabricated to test the two methods. Cooling was done by thermoelectric modules using an ice-water bath as a heat sink. The DTA method was later modified to eliminate the reference fuel. The data from the sample were digitized and a point of inflection, which corresponds to the ASTM D-2386 freezing point (final melting point), was identified from the derivative. The apparatus was modifified to cool the fuel to -60 C and controls were added for maintaining constant cooling rate, rewarming rate, and hold time at minimum temperature. A parametric series of tests were run for twelve fuels with freezing points from -10 C to -50 C, varying cooling rate, rewarming rate, and hold time. Based on the results, an optimum test procedure was established. The results showed good agreement with ASTM D-2386 freezing point and differential scanning calorimetry results.
Document ID
19840010351
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Mathiprakasam, B. (Midwest Research Inst. Kansas City, MO, United States)
Date Acquired
September 4, 2013
Publication Date
February 9, 1984
Subject Category
Propellants And Fuels
Report/Patent Number
NASA-CR-168305
NAS 1.26:168305
MRI-7014-2
Accession Number
84N18419
Funding Number(s)
PROJECT: RTOP 505-31-42
CONTRACT_GRANT: AS3-22543
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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