Maritime University of Chabahar

Chāh Bahār, Iran

Maritime University of Chabahar

Chāh Bahār, Iran
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Abdollahzadeh Jamalabadi M.Y.,Maritime University of Chabahar | Abdollahzadeh Jamalabadi M.Y.,Gyeongsang National University | Park J.H.,Gyeongsang National University | Lee C.Y.,Korea Institute of Industrial Technology
Thermal Science | Year: 2014

This study presents the effect of thermal radiation on the steady flow in a vertical micro channel filled with highly absorbing medium. The governing equations (mass, momentum and energy equation with Rosseland approximation and slip boundary condition) are solved analytically. The effects of thermal radiation parameter, the temperature parameter, Reynolds number, Grashof number, velocity slip length, and temperature jump on the velocity and temperature profiles, Nusselt number, and skin friction coefficient are investigated. Results show that the skin friction and the Nusselt number are increased with increase in Grashof number, velocity slip, and pressure gradient while temperature jump and Reynolds number have an adverse effect on them. Furthermore, a criterion for the flow unsteadiness based on the temperature parameter, thermal radiation parameter, and the temperature jump is presented.


Abdollahzadeh Jamalabadi M.Y.,Maritime University of Chabahar | Abdollahzadeh Jamalabadi M.Y.,Gyeongsang National University | Hyun Park J.,Gyeongsang National University
Thermal Science | Year: 2014

Enhancement of thermal and heat transfer capabilities of phase change materials with addition of nanoparticles is reported. The mixed nanofluid of phase change material and nanoparticles presents a high thermal conductivity and low heat capacity and latent heat, in comparison with the base fluid. In order to present the thermophysical effects of nanoparticles, a solidification of nanofluid in a rectangular enclosure with natural convection induced by different wall temperatures is considered. The results show that the balance between the solidification acceleration by nanoparticles and slowing-down by phase change material gives rise to control the medium temperature. It indicates that this kind of mixture has great potential in various applications which requires temperature regulation. Also, the Brownian motion of nanoparticles enhances the convective heat transfer much more than the conductive transfer.


Jamalabadi M.Y.A.,Maritime University of Chabahar | Jamalabadi M.Y.A.,Gyeongsang National University | Park J.H.,Gyeongsang National University | Lee C.Y.,Korea Institute of Industrial Technology
Entropy | Year: 2015

Investigation of the effect of thermal radiation on a fully developed magnetohydrodynamic (MHD) convective flow of a Newtonian, incompressible and electrically conducting fluid in a vertical microchannel bounded by two infinite vertical parallel plates with constant temperature walls through a lateral magnetic field of uniform strength is presented. The Rosseland model for the conduction radiation heat transfer in an absorbing medium and two plates with slip-flow and no-slip conditions are assumed. In addition, the induced magnetic field is neglected due to the assumption of a small magnetic Reynolds number. The non-dimensional governing equations are solved numerically using Runge-Kutta-Fehlberg method with a shooting technique. The channel is optimized based on the Second Law of Thermodynamics by changing various parameters such as the thermal radiation parameter, the temperature parameter, Hartmann number, Grashof to Reynolds ratio, velocity slip length, and temperature jump. © 2015 by the authors.

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