Aerosol deposition rates by mass diffusion in laminar boundary layers with an implemented blowing system. Approximate methods for flat plates

2020 ◽  
Vol 141 ◽  
pp. 105500
Author(s):  
Joaquin Aguirre ◽  
Alvaro Perea
Keyword(s):  
Boundary Layers ◽  
Aerosol Deposition ◽  
Mass Diffusion ◽  
Flat Plates ◽  
Approximate Methods ◽  
Deposition Rates ◽  
Laminar Boundary Layers

Approximate Methods for Calculating Heated Water Laminar Boundary-Layer Properties

1979 ◽  
Vol 46 (1) ◽  
pp. 9-14 ◽  
Author(s):  
G. M. Harpole ◽  
S. A. Berger ◽  
J. Aroesty
Keyword(s):  
Boundary Layers ◽  
Integral Method ◽  
Numerical Solutions ◽  
Approximate Methods ◽  
Laminar Boundary Layers ◽  
Heated Water ◽  
Nusselt Numbers ◽  
Variable Fluid Properties ◽  
Fluid Properties ◽  
High Prandtl Number

The integral method of Thwaites, for computing the primary parameters of laminar boundary layers with constant fluid properties, is extended to heated boundary layers in water, taking into account variable fluid properties. Universal parameters are correlated from numerical solutions of heated water wedge flows for use with the integral method. The method shows good accuracy in a test with the Howarth retarded flow. The Lighthill high Prandtl number approximation is extended to permit computation of the Nusselt number for boundary layers with variable fluid properties. Nusselt numbers computed for the Howarth flow are close to the exact numerical solutions, except near separation.

Thermal Radiation in Laminar Boundary Layers on Continuous Moving Surfaces

1974 ◽  
Vol 96 (1) ◽  
pp. 32-36 ◽  
Author(s):  
C. A. Rhodes ◽  
C. C. Chen
Keyword(s):  
Heat Transfer ◽  
Thermal Radiation ◽  
Boundary Layers ◽  
Analytical Study ◽  
Radiation Flux ◽  
Radiation Heat Transfer ◽  
Normal Velocity ◽  
Radiation Heat ◽  
Flat Plates ◽  
Laminar Boundary Layers

Thermal radiation heat transfer is studied in boundary layers on continuous moving surfaces. An analytical study is performed for two-dimensional laminar flow of an absorbing and emitting fluid. Solutions were obtained for limiting conditions of optically thin and thick boundary layers. Comparisons indicate that the radiation flux in these boundary layers is less than that for flow over semi-infinite flat plates for optically thin flows. The radiation contribution becomes more nearly equal as optical thickness increases. The normal velocity induced in the free stream by the wall motion significantly affects the radiation heat transfer.

Approximate Methods of Solving the Laminar Boundary-Layer Equations

1962 ◽  
Vol 13 (3) ◽  
pp. 285-290 ◽  
Author(s):  
R. M. Terrill
Keyword(s):  
Boundary Layer ◽  
Circular Cylinder ◽  
Skin Friction ◽  
Boundary Layers ◽  
Laminar Boundary Layer ◽  
Numerical Solutions ◽  
Approximate Methods ◽  
Boundary Layer Equations ◽  
Laminar Boundary Layers ◽  
Remarkable Agreement

SummaryCurie and Skan have modified the approximate methods of Thwaites and Stratford to predict separation properties of laminar boundary layers for flow over an impermeable surface. The work of Curie and Skan has been extended by Curle to include the estimation of laminar skin friction for the whole flow. The purpose of the following note is to compare the approximate methods of Curie and Skan and Curle with the numerical results given by the author for flow past a circular cylinder. It is found that there is remarkable agreement between these approximate methods and the exact numerical solutions. This indicates that these methods can be used widely, both on account of their simplicity and their accuracy.

Approximate Methods for Predicting Separation Properties of Laminar Boundary Layers

1957 ◽  
Vol 8 (3) ◽  
pp. 257-268 ◽  
Author(s):  
N. Curle ◽  
S. W. Skan
Keyword(s):  
Boundary Layer ◽  
Boundary Layers ◽  
Laminar Boundary Layer ◽  
Boundary Layer Flow ◽  
Approximate Methods ◽  
Laminar Boundary Layers ◽  
Layer Flow

SummarySome new solutions for steady incompressible laminar boundary layer flow, obtained by Gortler, have been used to test the accuracy of two methods which are commonly used to predict separation. A modification of Stratford's criterion for separation is given in this paper and is probably the most accurate and the simplest of all methods at present in use. Modified numerical functions are also given for Thwaites's method of predicting the main characteristics of the boundary layer over the whole surface, which improve the accuracy of the method.

NEW IMAGINARY-VALUED SIMILARITY SOLUTIONS FOR LAMINAR BOUNDARY LAYERS WITH A SPRAY

2009 ◽  
Vol 19 (12) ◽  
pp. 1105-1111
Author(s):  
Ro'ee Z. Orland ◽  
David Katoshevski ◽  
D. M. Broday
Keyword(s):  
Boundary Layers ◽  
Similarity Solutions ◽  
Laminar Boundary Layers

scholarly journals On a Simple Method for Calculating Laminar Boundary Layers

1954 ◽  
Vol 5 (1) ◽  
pp. 25-38 ◽  
Author(s):  
K. E. G. Wieghardt
Keyword(s):  
Boundary Layers ◽  
Parametric Method ◽  
Symmetric Flow ◽  
Numerical Constant ◽  
Simple Method ◽  
Plane Flow ◽  
Laminar Boundary Layers ◽  
Energy Equations

SummaryA simple one parametric method, due to A. Walz and based on the momentum and energy equations, for calculating approximately laminar boundary layers is extended to cover axi-symmetric flow as well as plane flow. The necessary computing work is reduced a little.Another known method which requires still less computing work is also extended for axi-symmetric flow and, with the amendment of a numerical constant, proves adequate for practical purposes.

Laminar boundary layers behind detonation waves

1983 ◽  
Vol 387 (1793) ◽  
pp. 331-349 ◽  
Keyword(s):  
Heat Transfer ◽  
Boundary Layer ◽  
Boundary Layers ◽  
Flow Analysis ◽  
Time Dependent ◽  
Detonation Waves ◽  
Planar Geometry ◽  
Laminar Boundary Layers ◽  
Spherical Detonation ◽  
Layer Flow

New solutions are presented for non-stationary boundary layers induced by planar, cylindrical and spherical Chapman-Jouguet (C-J) detonation waves. The numerical results show that the Prandtl number ( Pr ) has a very significant influence on the boundary-layer-flow structure. A comparison with available time-dependent heat-transfer measurements in a planar geometry in a 2H 2 + O 2 mixture shows much better agreement with the present analysis than has been obtained previously by others. This lends confidence to the new results on boundary layers induced by cylindrical and spherical detonation waves. Only the spherical-flow analysis is given here in detail for brevity.

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