News Column

New Findings from Gulbarga University in the Area of Mechanical Engineering Reported

May 28, 2014

By a News Reporter-Staff News Editor at Journal of Engineering -- Investigators publish new report on Mechanical Engineering. According to news reporting from Karnataka, India, by VerticalNews journalists, research stated, "Linear and nonlinear stability analysis for the onset of convection in a horizontal layer of a porous medium saturated by a nanofluid is studied. The model used for the nanofluid incorporates the effects of Brownian motion and thermophoresis."

The news correspondents obtained a quote from the research from Gulbarga University, "The modified Darcy equation that includes the time derivative term is used to model the momentum equation. In conjunction with the Brownian motion, the nanoparticle fraction becomes stratified, hence the viscosity and the conductivity are stratified. The nanofluid is assumed to be diluted and this enables the porous medium to be treated as a weakly heterogeneous medium with variation, in the vertical direction, of conductivity and viscosity. The critical Rayleigh number, wave number for stationary and oscillatory mode and frequency of oscillations are obtained analytically using linear theory and the non-linear analysis is made with minimal representation of the truncated Fourier series analysis involving only two terms. The effect of various parameters on the stationary and oscillatory convection is shown pictorially. We also study the effect of time on transient Nusselt number and Sherwood number which is found to be oscillatory when time is small."

According to the news reporters, the research concluded: "However, when time becomes very large both the transient Nusselt value and Sherwood value approaches to their steady state values."

For more information on this research see: The onset of convection in a nanofluid saturated porous layer using Darcy model with cross diffusion. Meccanica, 2014;49(5):1159-1175. Meccanica can be contacted at: Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands. (Springer -; Meccanica -

Our news journalists report that additional information may be obtained by contacting J.C. Umavathi, Gulbarga Univ, Dept. of Math, Gulbarga 585106, Karnataka, India.

Keywords for this news article include: Asia, India, Karnataka, Mechanical Engineering

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Source: Journal of Engineering

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