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Effect of pressure gradient on sonic‐point heat transfer
Author(s) -
Talmor Eliyahu
Publication year - 1968
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690140123
Subject(s) - boundary layer , mechanics , pressure gradient , turbulence , heat transfer , adverse pressure gradient , thermodynamics , churchill–bernstein equation , boundary layer thickness , flow separation , chemistry , physics , nusselt number , reynolds number
Abstract An analytical investigation of gas side heat transfer in high contraction, high convergence flows is presented. A partical criterion for retransition of a turbulent boundary layer is derived from the integral momentum equation and the effect of pressure gradient in the turbulent boundary‐layer flow regime is described with the help of external flow relations. The validity of the analytical results is demonstrated by comparison to available internal and external flow, throat heat transfer data. Accordingly, various turbulent boundary‐layer heat transfer levels are obtained depending on the sonic‐point pressure gradient, the specific heat ratio, the reference‐to‐stagnation temperature ratio, and the exponent of the viscosity‐temperature function. Furthermore, the pressure gradient and the superficial mass velocity have opposite effects on the onset of retransition of a turbulent boundary layer.