Accession Number : ADA468418


Title :   Cooling Performance of a Partially-Confined FC-72 Spray: The Effect of Dissolved Air (Postprint)


Descriptive Note : Conference paper


Corporate Author : AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH POWER DIVISION


Personal Author(s) : Puterbaugh, Rebekah L ; Yerkes, Kirk L ; Michala, Travis E ; Thomas, Scott K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a468418.pdf


Report Date : Jan 2007


Pagination or Media Count : 14


Abstract : This paper discusses the heat transfer performance of a partially-confined FC-72 spray with varying dissolved air concentrations. An experimental test rig was used to obtain critical heat flux (CHF) data. A nozzle allowed the fluid to be sprayed onto a thick-film resistor heater, which was mounted onto a glass post, with a sump system to allow removal of excess fluid. Type-E thermocouples were imbedded in the post to obtain temperature data. The parametric ranges for testing were: volume-percent concentration of dissolved air, 1 C 20%, chamber saturation pressure, 6.90E+4 Psat 8.27E+4 N/rn2, subcooling, 2 DeltaTsc 12 deg C, volumetric flow rate, 6.31E-6 V 10.5E-6 rn3/s. Test data were obtained for comparison of CHF with varying C while controlling the spray chamber pressure. An empirical mathematical relationship allowing for determination of surface heat flux with varying flow rate was also developed. The model was obtained using test data at flow rates of V = 6.31E-6, 8.41E-6, and 1O.5E-6 m3/s, and was validated using experimental data obtained for flow rates of V = 7.36E-6 and 9.46E-6 m3/s.


Descriptors :   *HIGH POWER , *ELECTRONIC EQUIPMENT , *TEMPERATURE CONTROL , MATHEMATICAL MODELS , HEAT TRANSFER COEFFICIENTS , MEASURES OF EFFECTIVENESS , COOLING AND VENTILATING EQUIPMENT , GRAVITY , SYMPOSIA


Subject Categories : Thermodynamics
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE