Computer Science
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........29p&link_type=abstract
Ph.D. Thesis Kentucky Univ., Lexington.
Computer Science
Airfoils, Cylindrical Bodies, Heat Transfer, Ice Formation, Navier-Stokes Equation, Wind Tunnel Tests, Fourier Analysis, Nusselt Number, Reynolds Number, Surface Roughness
Scientific paper
Laboratory scale experiments conducted in the subsonic wind tunnel facility at the University of Kentucky are discussed. Experimental convective local heat transfer coefficients were obtained for a simulated, full scale, selected set of 2, 5, 15 minute glaze ice models on a cylinder, and 0, 5 minute glaze ice models on a NACA 0012 airfoil. A steady state heat flux method was employed. The results show very good quantitative and qualitative agreement. The local heat transfer rate increases with increasing Reynolds number and as the ice grows shows a decreasing trend within the cup-like region formed in the forward zone. An attempt was made to define surface roughness by applying two-dimensional Fourier analysis to surface profiles of a 15 minute glaze ice accretion on a cylinder. When results of smooth glaze ice models are compared to those of rough models increases of up to 115 percent in the local heat-transfer rate are observed to occur primarily at the tips of the horns. This increase is partially attributed to the increase in area subtended by the roughness elements to the flow. A numerical formulation of a two-dimensional, unsteady, compressible Navier-Stokes code is introduced. Numerical tests are performed on the NACA 0012 profile and compared with experimental results.
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