An exact analysis is carried out to study the radiation effects on an unsteady natural convective flow of a nanofluid past an impulsively started infinite vertical plate. The nanofluids containing nanoparticles of aluminium oxide, copper, titanium oxide and silver with nanoparticle volume fraction range less than or equal to 0.04 are considered. The partial differential equations governing the flow are solved by Laplace transform technique. The influence of various parameters on velocity and temperature profiles, as well as Nusselt number and skin-friction coefficient, are examined and presented graphically. An increase in radiation parameter and time leads to fall in temperature of the fluid. The presence of nanoparticles and thermal radiation increases the rate of heat transfer and skin friction. The effect of heat transfer is found to be more pronounced in silver water nanofluid than in the other nanofluids. It is observed that the fluid velocity increases with an increase in Grashof number and time. Excellent validation of the present results is achieved with existing results in the literature.
This paper reports on the effect of ZrB2 and hBN solid lubricant particles on the dry sliding wear behaviour of the AA7075 composite, fabricated by stir-squeeze cast technique. ZrB2 and hBN at levels of 5 wt% were chosen as reinforcements for the study. The optical microscope images revealed uniform distribution of particles and a low order of porosity in microstructure, possibly due to the squeeze pressure. The ZrB2 particles reinforced composite (AZ) showed an improvement in hardness compared to as-cast (A0) and hBN containing composite (AH). A minor reduction in the hardness of ZrB2–hBN hybrid composite (AZH) was observed. This is attributed to changes in the hardness induced by the individual ZrB2 and hBN particles. The hybrid composite (AZH) exhibits a superior wear resistance, possibly due to the formation of good quality B2O3 and H3BO3 self-lubricating film.
The convective Casson fluid flow past a Riga plate is investigated theoretically. The flow properties are elucidated through the analytical solutions of transport equations which are acquired by adopting the Laplace transform technique. This study mainly focuses on nonlinear flow characteristics under radiation, permeability and the wall parallel Lorentz force. The positive modified Hartmann number refers to the aiding flow which enhances the flow speed. The comparison between Newtonian and non-Newtonian fluid flow subject to the wall parallel Lorentz force has also been done graphically. Further, the results of this Casson fluid flow model correlated with the vertical flow under buoyancy effect.
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