Showing papers by "Richard J Goldstein published in 1982"

Mass Transfer in the Neighborhood of Jets Entering a Crossflow

Abstract: The mass-transfer coefficient in the neighborhood of a row of jets entering a cross flow is determined by measuring the local sublimation rate from a naphthalene surface. This mass transfer relates directly to the heat transfer that would occur on a film-cooled wall. The experiments indicate that jets significantly increase the transfer coefficient in the neighborhood of the holes through which the jets emanate—in particular, immediately adjacent to the holes and also some distance downstream of the centerlines of the holes.

Local Heat Transfer to Staggered Arrays of Impinging Circular Air Jets

Abstract: Measurements are made of the local heat transfer from a flat plate to impinging arrays of staggered circular air jets. Fluid from the spent jets is constrained to flow out in one direction. Two different jet-to-jet spacings, 4 and 8 jet diameters, are employed. The parameters that are varied include jet-orifice-plate to impingement-surface spacing and jet Reynolds number. Local heat transfer coefficients vary periodically both in the flow direction and across the span with high values occurring at stagnation regions. Stagnation regions of individual jets as determined by local heat transfer coefficients move further in the downstream direction as the amount of crossflow due to upstream jet air increases. Local heat transfer coefficients are averaged numerically to obtain spanwise and streamwise-spanwise averaged heat transfer coefficients.Copyright © 1982 by ASME