The effect of an interface boundary layer on the resonance properties of a buried structure

2004 ◽  
Vol 33 (2) ◽  
pp. 227-247 ◽  
Author(s):  
Y. S. Karinski ◽  
V. V. Shershnev ◽  
D. Z. Yankelevsky
Keyword(s):  
Boundary Layer ◽  
Interface Boundary ◽  
Resonance Properties

Velocity Distribution of Non-Darcy Flow in a Porous Medium

2009 ◽  
Vol 25 (1) ◽  
pp. 49-58 ◽  
Author(s):  
J. M. Leu ◽  
H. C. Chan ◽  
Lih-Fu Tu ◽  
Yafei Jia ◽  
S. Y. Wang
Keyword(s):  
Boundary Layer ◽  
Porous Medium ◽  
Analytical Solution ◽  
Velocity Distribution ◽  
Slip Velocity ◽  
Darcy Law ◽  
Interface Boundary ◽  
Proportionality Constant ◽  
Boundary Layer Region ◽  
Layer Region

AbstractThis study theoretically and experimentally investigates the velocity distributions of the interface boundary layer region in a porous medium. By combining a quadratic non-Darcy law and a practical eddy viscosity model, an analytical solution is derived and presented. Three additional parameters, i.e., the depth of the interface boundary layer region, the slip velocity, and proportionality constant, are contained in the analytical solution. The measured experimental data show the depth of the interface boundary layer region only depends on the characteristics of the porous medium rather than the relative flow depth, bed slop, or Reynolds number. The values of the slip velocity are found to increase with increasing relative mean clear fluid velocities. The proportionality constant plays an important role in modeling the penetration of turbulence and the associated momentum transfer. The measured experimental velocity distribution is used to evaluate the accuracy of the analytical predicted profile. The analytical results obtained in this study are in agreement with the measured experimental results.

scholarly journals APPROXIMATE ANALYTICAL SOLUTION OF THE PROBLEM OF CONJUGATE HEAT TRANSFER BETWEEN THE BOUNDARY LAYER AND THE ANISOTROPIC STRIP

2019 ◽  
Vol 16 (32) ◽  
pp. 572-582
Author(s):  
Vladimir F. FORMALEV ◽  
Sergey A. KOLESNIK ◽  
Ekaterina L. KUZNETSOVA
Keyword(s):  
Thermal Conductivity ◽  
Boundary Layer ◽  
Heat Conduction ◽  
Analytical Solution ◽  
Integral Transform ◽  
External Boundary ◽  
Interface Boundary ◽  
Heat Flows ◽  
Anisotropic Heat Conduction ◽  
Longitudinal Variable

Optimization of technological processes in metallurgy related to transfer and use of heat energy makes more complicated demands for calculation of heat exchange. Therefore, the work, the approximate analytical method for solving the conjugate problems of viscous gas-dynamic boundary layer and thermal conductivity in the anisotropic strip, has been developed. The paper uses modern numerical methods for solving differential equations in partial derivative and analytic methods on the basis of an integral transform of Fourier and Laplace. Boundary equations have been solved analytically with certain simplifications, and the problem of anisotropic heat conduction has been solved analytically. The heat flows are determined analytically by the longitudinal variable at the interface boundary. It has been established that temperature increase of the external surface contributes to that all factors directly impacting on the magnitude of heat flows act towards their reduction. The analytical solution for the problem of thermal conductivity in the anisotropic strip with a general type of anisotropy when the heat flows from the boundary layer are determined at the boundaries is obtained. The conducted research for the temperature of external boundary and heat flow from gas to it demonstrates that with increasing the degree of longitudinal anisotropy the surface temperature of the strip downstream increases from increasing longitudinal heat conduction An original conjugation method using the continuous heat flows, and temperatures at the interface boundary is found. The numerical results for the heat flows and temperatures at the interface boundary have been obtained and analyzed.

Effects of continental boundary layer evolution, convection, turbulence and entrainment, on aerosol formation

Tellus B ◽  
2001 ◽  
Vol 53 (4) ◽  
pp. 441-461 ◽  
Author(s):  
E. D. NILSSON ◽  
Ü. RANNIK ◽  
M. KULMALA ◽  
G. BUZORIUS ◽  
C. D. O'DOWD
Keyword(s):  
Boundary Layer ◽  
Aerosol Formation

Characteristics of the Night and Day Time Atmospheric Boundary Layer at Dome C, Antarctica

2007 ◽  
Vol 25 ◽  
pp. 49-55 ◽  
Author(s):  
S. Argentini ◽  
I. Pietroni ◽  
G. Mastrantonio ◽  
A. Viola ◽  
S. Zilitinchevich
Keyword(s):  
Boundary Layer ◽  
Atmospheric Boundary Layer ◽  
Night And Day
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