Analytical Methods to Predict Liquid Congealing in Ram Air Heat Exchangers During Cold Operation 891439
RAM AIR HEAT EXCHANGERS used to cool liquids such as lube oils or Ethylene-Glycol/water solutions can be subject to congealing in very cold ambients, resulting in a loss of cooling capability. Two-dimensional, transient analytical models have been developed to explore this phenomenon with both continuous and staggered fin cores. Staggered fin predictions are compared to flight test data from the E-2C Allison T56 engine lube oil system during winter conditions. For simpler calculations, a viscosity ratio correction was introduced and found to provide reasonable cold ambient performance predictions for the staggered fin core, using a one-dimensional approach.
Citation: Coleman, K. and Kosson, R., "Analytical Methods to Predict Liquid Congealing in Ram Air Heat Exchangers During Cold Operation," SAE Technical Paper 891439, 1989, https://doi.org/10.4271/891439. Download Citation
Author(s):
Kenneth Coleman, Robert Kosson
Pages: 18
Event:
Intersociety Conference on Environmental Systems
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE Transactions Journal of Aerospace-V98-1
Related Topics:
Lubricating oils
Heat exchangers
Engine lubricants
Flight tests
Cold weather
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