Microorganism cells movement in fluid is universal and affects many ecological and biological processes, including infection, reproduction and marine life ecosystem. There are many biological and medical applications that require understanding of transport process in nanofluids containing suspension of microorganism. The present problem deals with the bioconvection of Casson nanofluid containing suspension of motile gyrotactic microorganisms over inclined stretching sheet in the presence of thermal radiation, viscous dissipation, and chemical reaction and magnetic field. At the surface, influence of the thermo-solutal Marangoni convection and suction / injection impact are considered. The governing equations are solved numerically by using fourth order Runge-Kutta method with shooting technique. Impact of the major pertinent parameters on the velocity, temperature, nanoparticles concentration and density of the motile microorganism is illustrated graphically. Finally, correlation of various crucial parameters on skin friction, local Nusselt number, Sherwood number and local motile microorganism density number are displayed through graphs and tables.

This work investigates the performance of underwater spark discharge relating to bubble growth and decay under high pressure and with salinity conditions by introducing a modified form of the resistance equation. Here, we study salinity influence on circuit parameters by fitting the experimental data for which gap resistance is much larger in conductive water than in dielectric water. Accordingly, the resistance equation is modified by considering the influence of both plasma and its surrounding liquid. Thermal radiation effect of the bubble is also studied by comparing two different radiation models. Numerical results predict a larger bubble pressure for saline water but a reduced size and a smaller bubble cycle at a greater water depth. Such study may be useful in many saltwater applications, including that for deep sea conditions. V C 2014 AIP Publishing LLC.

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In this article, using the standard reductive perturbation technique (RPT) to the basic governing equations for plasma comprising stationary ions, cold electrons and hot electrons abiding by vortex-like distribution, nonplanar Schamel Burger (NSB) equations is derived. In order to study the propagating properties of Electron acoustic (EA), progressive wave solution is obtained by employing the weighted residual method (WRM). Most of the observations of the EA wave are limited to the plasma environment where the effects of viscosity, collisions, ion streaming velocity are totally neglected. In our present observation, propagation of EA waves in a viscous plasma is described considering a weak damping (by adding a Burgers term) due to the inner particle collision and viscosity. Special attention has been given to study the impact of the other physical parameters in wave propagation in the framework of the Schamel Burgers medium.

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