Conjugate Heat Transfer Analysis with Subcooled Boiling for an Arc-Heater Wind Tunnel Nozzle
Title:
Conjugate Heat Transfer Analysis with Subcooled Boiling for an Arc-Heater Wind Tunnel Nozzle
Author:
Weaver, M. A. Gramoll, K. C.
Appeared in:
Heat transfer engineering
Paging:
Volume 17 (1996) nr. 4 pages 19-33
Year:
1996-10-01
Contents:
A method for unsteady, axisymmetric, conjugate heat transfer analysis has been developed. The conjugate heat transfer domain comprises co-flowing high-temperature air and subcooled water coolant on opposite sides of a copper-zirconium, converging nozzle. Heat transfer through the nozzle wall is characterized by solid-body conduction with convection boundary conditions along the air side and water side of the nozzle wall. The air-side heat transfer is characterized by forced convection with a turbulent boundary layer. The water-side heat transfer is characterized by forced-convection, subcooled, nucleate boiling. Convective heat transfer coefficients on each side of the nozzle wall are functions of the wall temperature and the respective flow properties, thus coupling the three regions of the domain. The solution method marches in time, solving, at each time step for the nozzle wall temperature distribution, the flow properties on each side of the nozzle wall, and for the convective heat transfer coefficients. The algorithm terminates when either the steady state is achieved or nozzle wall failure conditions are reached. Solutions are obtained for four test cases culled from the run history of the Arnold Engineering Development Center HEAT-H1 Test Unit. Results show that the recorded test case failures were not caused by precritical boiling effects. Conclusive failure analysis for the HEAT-H1 test cases awaits application of an appropriate convective boiling critical heat flux model, along with creep and stress-rupture models for the nozzle wall.
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