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Hamza Berrehal 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
An analytical analysis has been carried out to investigate the second law of thermodynamics in magnetohydrodynamic (MHD) boundary layer flow and heat transfer by moving wedge. The governing PDEs of momentum, energy, and entropy generation are converted into nonlinear ODEs via similarity variables and then solved analytically using the optimal homotopy asymptotic method. The expression of entropy generation number is obtained in dimensionless form. Results revealed that the minimum entropy production is achieved when the wedge moves in the opposite direction to the free stream (for the negative values of velocity ratio parameter λ). Moreover, the magnetic field influences the increase in entropy production.
FALKNER-SKAN EQUATION FOR FLOW PAST A MOVING WEDGE WITH SUCTION OR INJECTION
Ishak, Anuar,Nazar, Roslinda,Pop, Ioan 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.25 No.1
The characteristics of steady two-dimensional laminar boundary layer flow of a viscous and incompressible fluid past a moving wedge with suction or injection are theoretically investigated. The transformed boundary layer equations are solved numerically using an implicit finite-difference scheme known as the Keller-box method. The effects of Falkner-Skan power-law parameter (m), suction/injection parameter ($f_0$) and the ratio of free stream velocity to boundary velocity parameter (${\lambda}$) are discussed in detail. The numerical results for velocity distribution and skin friction coefficient are given for several values of these parameters. Comparisons with the existing results obtained by other researchers under certain conditions are made. The critical values of $f_0$, m and ${\lambda}$ are obtained numerically and their significance on the skin friction and velocity profiles is discussed. The numerical evidence would seem to indicate the onset of reverse flow as it has been found by Riley and Weidman in 1989 for the Falkner-Skan equation for flow past an impermeable stretching boundary.
정시교(Si-Kyo Jung),맹희영(Heeyoung MAENG) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.6
A jig vise is a device to clamp workpiece precisely, which is widely used for various machine tools and manufacturing purpose. A new elastic structured jaw-wedge of jig vise is developed, in this paper, so as to satisfy the clamping requirement and the suppression effect of upright movement of workpiece. The advanced design parameters of jaw-wedge are derived step by step considering the stress distribution and the displacement profiles of ANSYS analysis, and it could find the optimum model which shows the uniform displacement profiles and exhibits the non-concentrated stress distribution of jaw neck. As a result, it is ascertained that an jaw-wedge developed in this study is the simple elastic structure which is effective for automatic multiple clamping purpose without the danger of shear crack or bucking of jaw.