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4 International Journal of Applied Mechanics and Engineering

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Generation of surface waves due to initial axisymmetric surface disturbance in water with a porous bottom

Kundu P., Mandal B. N.

International Journal of Applied Mechanics and Engineering

2019

Vol. 24, no. 3

625--644

A two-dimensional Cauchy Poisson problem for water with a porous bottom generated by an axisymmetric initial surface disturbance is investigated here. The problem is formulated as an initial value problem for the velocity potential describing the motion in the fluid. The Laplace and Hankel transform techniques have been used in the mathematical analysis to obtain the form of the free surface in terms of a multiple infinite integral. This integral is then evaluated asymptotically by the method of stationary phase. The asymptotic form of the free surface is depicted graphically in a number of figures for different values of the porosity parameter and for different types of initial disturbances.

Ferdows M., Liu D.

International Journal of Applied Mechanics and Engineering

2017

Vol. 22, no. 1

253--258

The aim of this work is to study the mixed convection boundary layer flow from a horizontal surface embedded in a porous medium with exponential decaying internal heat generation (IHG). Boundary layer equations are reduced to two ordinary differential equations for the dimensionless stream function and temperature with two parameters: ε, the mixed convection parameter, and λ, the exponent of x. This problem is numerically solved with a system of parameters using built-in codes in Maple. The influences of these parameters on velocity and temperature profiles, and the Nusselt number, are thoroughly compared and discussed.

Mixed convection in the stagnation-point flow over a vertical stretching sheet in the presence of thermal radiation

Manjunatha S., Gireesha B. J., Bagewadi C. S.

International Journal of Applied Mechanics and Engineering

2015

Vol. 20, no. 4

871--888

An unsteady two-dimensional stagnation-point mixed convection flow of a viscous, incompressible dusty fluid towards a vertical stretching sheet has been examined. The stretching velocity and the free stream velocity are assumed to vary linearly with the distance from the stagnation point. The problem is analyzed using similarity solutions. The similarity ordinary differential equations were then solved numerical by using the RKF-45 method. The effects of various physical parameters on the velocity profile and skin-friction coefficient are also discussed in this paper. Some important findings reported in this work reveal that the effect of radiation has a significant impact on controlling the rate of heat transfer in the boundary layer region.

Shear crack formatlon in cold drawing of magnesium and cobalt wires

Eickemeyer J., Falter M., Guth A.

International Journal of Applied Mechanics and Engineering

2007

Vol. 12, no 4

1173-1179

The process of surface roughness development on cold drawn magnesium and cobalt wires inside the conical drawing hole was analysed using a wire stick preparation. It is shown that the hep-metals cobalt and magnesium are prone to be roughened in the conical part of the drawing hole. This roughening, including shear localization, leads to shear cracking. Shear cracks grow from the surface into the peripheral material of the wire in the die exit zone.