Christ University

About: Christ University is a education organization based out in Bengaluru, India. It is known for research contribution in the topics: Computer science & Convection. The organization has 2267 authors who have published 2715 publications receiving 14575 citations. The organization is also known as: Christ College & Christ University.

Classification, Source, and Effect of Environmental Pollutants and Their Biodegradation.

Abstract: Any foreign chemical substance that is unusually present within an organism or is unexpectedly found in the environment at a higher concentration than the permissible limits can be termed a xenobiotic or a pollutant. Such substances include carcinogens, drugs, food additives, hydrocarbons, dioxins, polychlorinated biphenyls, pesticides or even some natural compounds. Pollutants are known for their higher persistence and pervasiveness, and along with their transformed products, they can remain in and interact with the environment for prolonged periods. In this article, the classification of such substances based on their nature, use, physical state, pathophysiological effects, and sources is discussed. The effects of pollutants on the environment, their biotransformation in terms of bioaccumulation, and the different types of remediation such as in situ and ex situ remediation, are also presented.

Heat transfer and entropy generation analysis of non-Newtonian fluid flow through vertical microchannel with convective boundary condition

Abstract: The entropy generation and heat transfer characteristics of magnetohydro-dynamic (MHD) third-grade fluid flow through a vertical porous microchannel with a convective boundary condition are analyzed. Entropy generation due to flow of MHD non-Newtonian third-grade fluid within a microchannel and temperature-dependent viscosity is studied using the entropy generation rate and Vogel's model. The equations describing flow and heat transport along with boundary conditions are first made dimensionless using proper non-dimensional transformations and then solved numerically via the finite element method (FEM). An appropriate comparison is made with the previously published results in the literature as a limiting case of the considered problem. The comparison confirms excellent agreement. The effects of the Grashof number, the Hartmann number, the Biot number, the exponential space- and thermal-dependent heat source (ESHS/THS) parameters, and the viscous dissipation parameter on the temperature and velocity are studied and presented graphically. The entropy generation and the Bejan number are also calculated. From the comprehensive parametric study, it is recognized that the production of entropy can be improved with convective heating and viscous dissipation aspects. It is also found that the ESHS aspect dominates the THS aspect.

Heat and Mass Transfer Effects on a Dissipative and Radiative Visco-Elastic MHD Flow over a Stretching Porous Sheet

Abstract: The objective of the present study is to consider a dissipative and radiative visco-elastic flow over a stretching porous sheet. The applicability of the present study is numerous in the polymer industry in stretching of sheets with dissipative environment. In view of its scope, the present study brings the work of Khan (Int J Heat Mass Transf 49, 1534–1542, 2005) and Singh (Int Comm Heat Mass Transf 35, 637–642, 2008) as particular cases. The solution of the momentum equation has been taken care of by similarity transformation and applying a particular solution satisfying boundary conditions. Further, the heat and mass transfer equations are solved by applying the confluent hypergeometric function (Kummer’s function). It is interesting to note that the presence of elastic element in the fluid, external magnetic field and suction at the plate reduce the skin friction favoring the stretching of sheets whereas heat loss has been minimized due to permeability of the medium, presence of heat source in case of low diffusive fluid.