Simple relations for the stability of heated-water laminar boundary layers

Autor:	J. Aroesty, W. S. King, G. M. Harpole, W. W. Matyskiela, C. Gazley, A. R. Wazzain
Rok vydání:	1982
Předmět:	Physics Aerospace Engineering Reynolds number Laminar flow Mechanics Curvature Critical ionization velocity Boundary layer thickness Physics::Fluid Dynamics Viscosity symbols.namesake Boundary layer Classical mechanics Fluid dynamics symbols
Zdroj:	AIAA Journal. 20:728-730
ISSN:	1533-385X 0001-1452
DOI:	10.2514/3.7941
Popis:	Dunn-Lin theory (1955) is shown to be applicable in the estimation of minimum critical Reynolds number for heated boundary layers. A parameter is defined to reflect the curvature of the velocity profile between wall and critical layer, and includes the variable kinematic viscosity. The value of the parameter is determined by assuming a linear viscosity profile, a parabolic velocity profile, and by calculating a dominant viscous term in the asymptotic solution of the Orr-Sommerfeld equation. The inclusion of the curvature permits accurate results for the laminar velocity profiles in the wall region. Comparisons are made between the obtained values and those derived from a numerical computation using the Orr-Sommerfeld equation for exact boundary layer profiles. Agreement is noted in predicting the location of the maximum attainable critical Reynolds number in certain cases, and the method is considered reliable within experimentally available pressure gradients and surface overheats.
Databáze:	OpenAIRE
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