Kuvempu University

About: Kuvempu University is a education organization based out in Shimoga, India. It is known for research contribution in the topics: Cyclic voltammetry & Carbon paste electrode. The organization has 1575 authors who have published 2210 publications receiving 39755 citations. The organization is also known as: KU.

Effects of chemical reaction and partial slip on the three-dimensional flow of a nanofluid impinging on an exponentially stretching surface

Abstract: The three-dimensional mixed convection boundary layer flow of a nanofluid induced by an exponentially stretching sheet is numerically investigated in the presence of thermal radiation, heat source/sink and first-order chemical reaction effects. The adopted nanofluid model incorporates the effects of Brownian motion and thermophoresis into the mathematical model. The first-order velocity slip boundary conditions are also taken into account. The governing boundary layer equations are transformed into a set of nonlinear ordinary differential equations by employing suitable similarity variables. The resultant equations are solved numerically using the Runge-Kutta-Fehlberg method. Obtained solutions are compared with previous results in a limiting sense from the literature, demonstrating an excellent agreement. To show the typical trend of the solutions, a parametric study is conducted. The axial velocity, transverse velocity, temperature and nanoparticle volume fraction profiles as well as the skin-friction coefficient, Nusselt and Sherwood numbers are demonstrated graphically as a representative set of numerical results and discussed comprehensively.

Diversity of phytoplanktons in a waste stabilization pond at Shimoga Town, Karnataka State, India.

Abstract: To understand the diversity of phytoplanktons in waste stabilization pond effluents the hitherto study is undertaken. Species diversity indices of Shannon-Wiener and Simpson were applied to phytoplanktons. The diversity indices are of mathematical function to explain the abundance of each species. The total numbers of algae identified were 71 species belonging to Cyanophyceae, Chlorophyceae, Euglenophyceae, Bacillariophyceace and Desmidaceae. Chlorella and Scenedesmus were the dominant forms among the algal genera throughout the study period. Phytoplanktons play a vital role in improving the water quality of wastewater in waste stabilization ponds. Diversity indices provide important information about rarity and commonness of species in a community. The diversity indices of all the species explained the water was moderately polluted with less diversity level and highest possible equal number of different species of phytoplanktons. Greater impact of pollution leads to the lesser diversity of phytoplanktons.

Non-Newtonian hybrid nanofluid flow over vertically upward/downward moving rotating disk in a Darcy-Forchheimer porous medium

Abstract: Researchers and engineers working in the field of thermal analysis are pursuing new ways to improve the performance of electrical devices by improving their thermal properties. Impressed by these applications, in this paper, we examined the influence of activation energy over Darcy–Forchheimer flow of Casson fluid with suspension of Graphene oxide and Titanium dioxide nanoparticles considering 50% of Ethylene glycol as base fluid in a porous media. The problem is basically an extension of the well-known problem of von Karman’s viscous pump in a situation where the disk rotates. The modelled equations are converted to ODEs using the similarity transformations. The numerical solution is obtained using the RKF-45 method by adopting shooting technique. The calculation of mass and heat transfer rate is analysed through graphs. It is observed that the upward and downward motion of the disk exerts similar effects to that of the injection/suction through the wall. The downward motion of the disk causes reduction in velocity and temperature fields. Furthermore, variation in velocity, thermal, and concentration gradients for several non-dimensional parameters are studied briefly and demonstrated with the help of graphs. The obtained result reveals that increase in Casson parameter reduces the velocity of the fluid.

Impact of nonlinear thermal radiation on magnetohydrodynamic three dimensional boundary layer flow of Jeffrey nanofluid over a nonlinearly permeable stretching sheet

Abstract: The motivation behind the existing paper is to investigate the effect of space and temperature dependent heat generation/absorption, nonlinear thermal radiation on three dimensional magnetohydrodynamic Jeffrey fluid stream over a nonlinearly permeable stretching sheet in the presence of the porous medium. An electrically conducting fluid in the presence of a uniform magnetic field is taken into account. Problem formulation is developed by assuming small magnetic Reynolds number subject to boundary layer theory. The governing partial differential equations are changed to a system of ordinary differential equations. Then obtained equations are solved numerically by applying RKF-45 method. The convergence of its solutions has been verified through plots and numerical data. A detailed parametric study is carried out to explore the effects of various physical parameters on the velocity, temperature, and nanoparticles concentration profiles. Local Nusselt numbers and Sherwood number are tabulated and discussed. Some of the results of the investigation are effect of magnetic field is to suppress the velocity field, which in turn causes the enhancement of the temperature field. Further, temperature and concentration profiles show similar behavior for thermophoresis parameter, but the opposite tendency is noted in the case of Brownian motion parameter.