Thermal Recovery Factors in Supersonic Flows of Gas Mixtures

[+] Author and Article Information
George Maise

Grumman Aircraft Corp., Bethpage, N. Y.

John B. Fenn

Department of Engineering and Applied Science, Yale University, New Haven, Conn.

J. Heat Transfer 94(1), 29-35 (Feb 01, 1972) (7 pages) doi:10.1115/1.3449866 History: Received June 24, 1969; Revised February 01, 1971; Online August 11, 2010


Thermal recovery factors were measured at the stagnation point of a hemispheric probe in low-density supersonic jets of helium–argon and hydrogen–nitrogen mixtures. A “guard” heater in the probe made it possible to eliminate conduction losses. Radiation corrections were small. The final values correspond to adiabatic conditions. With jets of mixed gases, experimental recovery factors were as high as 1.6, substantially above the free molecule limit for pure gases. It is suggested that these anomalously high values are due to the species separation which occurs during the stagnation process and which results in concentrations of heavy species in the stagnation zone higher than in the free stream. The results are correlated in terms of the degree of rarefaction and the composition of the jet gas.

Copyright © 1972 by ASME
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