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Study of Boundary-layer Flows with Pressure Gradient and Mass Transfer by a Simple Integral Method

Author : Tse-Fou Zien

Publisher :

Page : 74 pages

File Size : 50,35 MB

Release : 1971

Category : Boundary layer control

ISBN :

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Book Description

A refined Karman-Pohlhausen method previously generalized by Zien to include the effects of mass transfer is further explored and its application is extended to cases involving both pressure gradients and surface mass transfer. The case with piece-wise suction (or blowing) is also included. The study is restricted to plane, incompressible, laminar boundary layers. Configurations of flat plates and circular cylinders are chosen to illustrate the application of the method. Results are given mainly in terms of skin frictions, and they are presented entirely in closed forms. The calculations for the porous plate case are carried out using rather elaborate velocity profiles, but the results differ negligibly from previous ones with very simple profiles. A linear velocity profile is then used to carry out some exploratory calculations for more complex flows. The method is shown to be a potentially efficient tool for handling the problem of boundary-layer control by means of surface mass transfer. (Author).



Study of Boundary-Layer Flows with Pressure Gradient and Mass Transfer by a Simple Integral Method

Author : Tse-Fou Zien

Publisher :

Page : 47 pages

File Size : 32,41 MB

Release : 1971

Category :

ISBN :

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Book Description

A refined Karman-Pohlhausen method previously generalized by Zien to include the effects of mass transfer is further explored and its application is extended to cases involving both pressure gradients and surface mass transfer. The case with piece-wise suction (or blowing) is also included. The study is restricted to plane, incompressible, laminar boundary layers. Configurations of flat plates and circular cylinders are chosen to illustrate the application of the method. Results are given mainly in terms of skin frictions, and they are presented entirely in closed forms. The calculations for the porous plate case are carried out using rather elaborate velocity profiles, but the results differ negligibly from previous ones with very simple profiles. A linear velocity profile is then used to carry out some exploratory calculations for more complex flows. The method is shown to be a potentially efficient tool for handling the problem of boundary-layer control by means of surface mass transfer. (Author).



Calculation of Turbulent Boundary Layers with Heat Transfer and Pressure Gradient Utilizing a Compressibility Transformation

Author : J. Boccio

Publisher :

Page : 50 pages

File Size : 50,7 MB

Release : 1972

Category : Equations of motion

ISBN :

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Book Description

An analysis of the incompressible turbulent boundary layer, developing under the combined effects of mass transfer and pressure gradient, is presented in this paper. A strip-integral method is employed whereby two of the three governing equations are obtained by integrating the combined momentum and continuity equation to 50 percent and 100 percent, respectively, of the boundary-layer height. The latter equation is the usual momentum-integral equation; the former equation requires specification of shear. Accordingly, Clauser's equilibrium eddy-viscosity law is assumed valid at this point. The third and final equation is obtained by specifying that Stevenson's velocity profiles apply throughout the domain of interest, from which a skin-friction law can be derived. Comparisons of the numerical results with the experiments of McQuaid, which include combined effects of variable pressure gradient and mass transfer, show good agreement.





Thick Boundary Layers Over Slender Bodies with Some Effects of Heat Transfer, Mass Transfer, and Pressure Gradient

Author : Martin H. Steiger

Publisher :

Page : 24 pages

File Size : 20,60 MB

Release : 1960

Category : Boundary layer

ISBN :

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Book Description

In this report the integral method is employed to investigate some effects of compressibility, heat transfer, mass transfer, and streamwise pressure gradient in boundary layers over slender bodies of revolution, where the boundary layer thickness is not necessarily small compared to the body radius. The results for zero pressure gradient without mass transfer are compared with those of other investigators in the low-speed case and in the adiabatic-surface case. These flows generally produce nonsimilar profiles. A special case of zero pressure gradient with mass transfer, which yields a similar solution, is solved. For flows with and without pressure gradients and mass transfer, special conditions which produce similar profiles are derived. For low-speed flow with no mass transfer but with pressure gradients, a set of nonsimilar soultions is presented.







Boundary Layer Flows

Author : Vallampati Ramachandra Prasad

Publisher : BoD – Books on Demand

Page : 236 pages

File Size : 10,68 MB

Release : 2020-01-22

Category : Mathematics

ISBN : 1839681853

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Book Description

Written by experts in the field, this book, "Boundary Layer Flows - Theory, Applications, and Numerical Methods" provides readers with the opportunity to explore its theoretical and experimental studies and their importance to the nonlinear theory of boundary layer flows, the theory of heat and mass transfer, and the dynamics of fluid. With the theory's importance for a wide variety of applications, applied mathematicians, scientists, and engineers - especially those in fluid dynamics - along with engineers of aeronautics, will undoubtedly welcome this authoritative, up-to-date book.



Coanda Effect

Author : Noor A Ahmed

Publisher : CRC Press

Page : 277 pages

File Size : 41,2 MB

Release : 2019-08-28

Category : Science

ISBN : 0429805438

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Book Description

Coanda effect is a complex fluid flow phenomenon enabling the production of vertical take-off/landing aircraft. Other applications range from helicopters to road vehicles, from flow mixing to combustion, from noise reduction to pollution control, from power generation to robot operation, and so forth. Book starts with description of the effect, its history and general formulation of governing equations/simplifications used in different applications. Further, it gives an account of this effect’s lift boosting potential on a wing and in non-flying vehicles including industrial applications. Finally, occurrence of the same in human body and associated adverse medical conditions are explained.