An approximate method for calculating laminar boundary-layer parameters in a diffuser

1975 ◽  
Vol 11 (1) ◽  
pp. 105-107
Author(s):  
A. P. Girol' ◽  
E. I. Katerina
Keyword(s):  
Boundary Layer ◽  
Approximate Method ◽  
Laminar Boundary Layer

Approximate Calculations of the Incompressible Laminar Boundary Layer

1967 ◽  
Vol 18 (3) ◽  
pp. 259-272 ◽  
Author(s):  
M. R. Head ◽  
N. Hayasi
Keyword(s):  
Boundary Layer ◽  
Exact Solution ◽  
Approximate Method ◽  
Laminar Boundary Layer ◽  
Calculation Method ◽  
Close Agreement ◽  
Computer Solution ◽  
Three Solutions ◽  
Recent Calculation ◽  
Good Agreement

SummaryA recent calculation method proposed by Curle has been applied to the flow U=U0ξe-ξ for which a computer solution exists. An earlier approximate method due to Head, presented here in a simplified form, has been applied to the same problem. All three solutions are found to be in close agreement. A further problem, already examined by Curle, is treated by Head’s method. Again the results are in good agreement with each other and with an exact solution obtained subsequently.

On oscillations in a compressible laminar boundary layer

1981 ◽  
Vol 91 (1-2) ◽  
pp. 1-13 ◽  
Author(s):  
R. J. Gribben
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Mach Number ◽  
Approximate Method ◽  
Skin Friction ◽  
Laminar Boundary Layer ◽  
High Frequency ◽  
Unsteady Heat Transfer ◽  
Reasonable Description

SynopsisThe behaviour of heat transfer and skin friction is analysed in a compressible laminar boundary layer with external velocity Ue(x)(l + α sin ωt The Mach number M is assumed small but finite so that high frequency flows (s ≫1) in which c =αγM2s/2 = O(1) are considered. Solutions, obtained by matching in the Stokes and Prandtl layers, involve summation of Fourier-like series to give the dominant terms in the heat transfer and skin friction. Results, for c =½, verify that a previous approximate method gives a reasonable description of unsteady heat transfer and skin friction; forc =1 there is a substantial increase in amplitude of heat transfer but little change of phase.

Frictional resistance of spheres rotating in power-law non-Newtonian fluids

1987 ◽  
Vol 52 (5) ◽  
pp. 1172-1177
Author(s):  
Pavel Mitschka
Keyword(s):  
Experimental Data ◽  
Boundary Layer ◽  
Approximate Method ◽  
Laminar Boundary Layer ◽  
Power Law ◽  
Frictional Resistance ◽  
Newtonian Fluids ◽  
Theoretical Solution ◽  
Power Law Fluids ◽  
Resistance Coefficients

Frictional resistance coefficients have been calculated for the rotation of spheres in non-Newtonian power-law fluids under laminar boundary-layer conditions using the approximate method of integral momentum balances. The values obtained agree satisfactorily with the available experimental data and the published theoretical solution.

An Approximate Method for the Solution of a Class of Nonsimilar Laminar Boundary Layer Equations

1976 ◽  
Vol 98 (2) ◽  
pp. 292-296 ◽  
Author(s):  
G. Nath
Keyword(s):  
Boundary Layer ◽  
Velocity Distribution ◽  
Approximate Method ◽  
Laminar Boundary Layer ◽  
Boundary Layer Flows ◽  
Freestream Velocity ◽  
Boundary Layer Equations ◽  
Transverse Curvature ◽  
Layer Velocity ◽  
Good Agreement

An approximate method is developed for locally nonsimilar laminar boundary layer flows. This method is applicable to several boundary layer velocity problems where the nonsimilarity stems from the freestream velocity distribution and the transverse curvature. The results are compared with those obtained by other methods and, except in the neighborhood of the point of separation, they are in good agreement.

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