Computational modeling of convective heat transfer to liquid hydrogen coolant

Details Computational modeling of convective heat transfer to liquid hydrogen coolant Computational modeling of convective heat transfer to liquid hydrogen coolant

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........66c&link_type=abstract

Ph.D. Thesis Virginia Univ., Charlottesville.

Statistics

Computation

Convective Heat Transfer, Coolants, Fluid Flow, Liquid Hydrogen, Temperature Dependence, Temperature Distribution, Thermophysical Properties, Boundary Conditions, Cooling, Dirichlet Problem, Ducted Flow, Heat Transfer Coefficients, Mass Flow Rate, Mathematical Models, Navier-Stokes Equation, Turbulence

Scientific paper

A computational algorithm capable of modeling the flow down a coolant duct of a fluid whose thermophysical properties vary with temperature was created and applied. The algorithm is formulated separately in two and three dimensions. Both approaches use space marching of the parabolized Navier-Stokes equations combined with the iterative recalculation of the fluid properties and turbulent intensities. The two-dimensional algorithm also iteratively couples the temperature distribution in the fluid with the heat transfer distribution in the bounding material. The externally applied heat transfer modeled approximates anticipated conditions in the cowl lip of the National Aerospace Plane (NASP). The proposed cooling by liquid hydrogen of the large surface heat transfer caused by external shock/shock interaction was found to give temperatures in the leading edge material that were close to the thermal limits of prospective materials. It was found that the performance of the coolant (i.e. the ability to cool the structure below a specific temperature) was very sensitive to inlet conditions of the coolant fluid as well as to the mass flow rate. The spread of the heat transfer on passing through the bounding material was found to be considerable and significantly reduced the maximum temperature of the fluid. The results of the three dimensional modeling showed that the principal restraint on the ability of the duct flow to convect heat was the build up of heat in corner boundary layers. It was found that the addition of a vortex to the center of the cross-stream flow in the inlet was not effective in decreasing the maximum temperature of the heated fluid. Dirichlet boundary conditions (i.e. specified temperatures) calculated from the two-dimensional algorithm were applied to the three-dimensional algorithm and demonstrated similarity between the heat transfer coefficients calculated by both methods.

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