Heat Transfer to Sulfur Hexafluoride Near the Thermodynamic Critical Region in a Natural-Circulation Loop

[+] Author and Article Information
G. E. Tanger, R. I. Vachon

Department of Mechanical Engineering, Auburn University, Auburn, Ala.

J. H. Lytle

Thermodynamics and Fluids, Mechanics Section, Chrysler Corporation, Space Division, Huntsville, Ala.

J. Heat Transfer 90(1), 37-42 (Feb 01, 1968) (6 pages) doi:10.1115/1.3597457 History: Received June 06, 1966; Revised April 04, 1967; Online August 25, 2011


Heat transfer near the thermodynamic critical region to sulfur hexafluoride was investigated in two closed natural circulation loops. The vertical distance between the test section and the heat exchanger was the primary difference between two loop configurations. Local and average heat transfer coefficients along the test section were calculated from the experimental data. Test results were correlated by the equation.

(Nu)(Grf)(Pr) = 0.00982 (Re)11/4
The range of variables included: System pressure, 535–896 psia, mean fluid bulk temperature, 111–193 deg F; specific volume, 0.016–0.043 cu ft/lbm ; heat flux, 1900–9040 Btu/hr sq ft. The highest heat transfer coefficients were obtained at system pressures and mean fluid bulk temperatures slightly greater than the critical values with mean specific volumes in the loop slightly less than the critical specific volume of the system fluid. The heat transfer coefficients were increased by expanding the vertical distance between the test section and heat exchanger.

Copyright © 1968 by ASME
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