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Heat Transfer Study of MHF-5 and MMH. Part 2
[Technical Report, Final Report]
AEROJET-GENERAL CORP SACRAMENTO CA
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This report presents the results of an experimental investigation of the heat transfer characteristics of MHF-5 and MMH at subcritical and supercritical pressures. Fifty-five heat transfer tests were conducted with electrically heated 347 stainless steel and inconel 718 tubes at the following ranges of conditions 250 to 3960 psia pressure, 17.7 to 205 ftsec velocity, -42 to 308 deg F bulk temperature, and heat fluxes up to 49.6 Btusq. in. At subcritical pressure, the burnout heat flux of MHF-5 and MMH was found to correlate with the product of velocity and subcooling. A reduction in burn-out heat flux, attributed to viscous effects, was observed with MHF-5 and MMH at low bulk temperatures. This type of behavior was found to have occurred in previous investigations with other propellants and a fairly general correlation for predicting this phenomenon was established. An unusual and pronounced effect of pressure on NHF-5 burnout heat flux was observed and empirically correlated. A burnout-like condition was found to exist with both propellants at supercritical pressure. It was found that the heat flux at which this condition developed, termed the ultimate heat flux, could be predicted reasonably well with convectional forced convection expressions in conjunction with a maximum wall temperature of 700 deg F.
[A, Approved For Public Release]