NOPR Collection:

Computational modeling of partial slip effects on hydromagnetic boundary layer flow past an exponential stretching surface in presence of thermal radiation

Sat, 01 Jun 2019 00:00:00 GMT

Title: Computational modeling of partial slip effects on hydromagnetic boundary layer flow past an exponential stretching surface in presence of thermal radiation Authors: Chaudhary, Santosh; Chaudhary, Susheela; Singh, Sawai Abstract: Numerical analysis of computational modeling is performed to investigate the influence of partial slip on boundary layer flow of electrically conducting incompressible viscous fluid over exponential stretching surface in the presence of thermal radiation. The impact of defining parameters are determined and governing boundary layer equations are reduced to ordinary differential equations by using appropriate similarity transformation. Numerical computation of the problem has been carried out by Runge-Kutta fourth order method in association with quasilinear shooting technique. Effects of magnetic parameter, radiation parameter, Prandtl number, suction or injection parameter, velocity slip parameter and thermal slip parameter on velocity and temperature profiles are computed and illustrated graphically, whereas numerical values of local skin friction coefficient and local Nusselt number are expressed through tabular arrays. Results for non-magnetic flow condition are found in concordance with earlier investigations. Page(s): 377-384

Second law analysis of MHD Casson and Maxwell fluid flow over a permeable stretching sheet with homogenous heterogeneous reactions and variable heat source

Sat, 01 Jun 2019 00:00:00 GMT

Title: Second law analysis of MHD Casson and Maxwell fluid flow over a permeable stretching sheet with homogenous heterogeneous reactions and variable heat source Authors: Jain, Shalini; Gupta, Preeti Abstract: Entropy generation analysis of MHD Casson and Maxwell fluid flow over a stretching sheet with space and temperature dependent non-uniform heat source/sink with porous media has been explored. Using appropriate similarity transformations, governing equations have been changed into ODE’s, and solved numerically using RK-fourth order method with shooting technique. The impact of pertinent parameters on velocity, temperature, entropy and Bejan number has been presented graphically. The skin friction and Nusselt number have been obtained and tabulated. Page(s): 385-399

MHD mixed convection boundary layer flow on a vertical permeable stretching sheet embedded in a porous medium with slip effects

Sat, 01 Jun 2019 00:00:00 GMT

Title: MHD mixed convection boundary layer flow on a vertical permeable stretching sheet embedded in a porous medium with slip effects Authors: Jhankal, A K; Jat, R N; Kumar, Deepak Abstract: In this paper, we investigate the problem of two-dimensional MHD mixed convection flow over a vertical permeable sheet embedded in a porous medium, with partial slip condition at the boundary. The nonlinear coupled boundary-layer equations have been transformed using an appropriate similarity transformation and resulting ordinary differential equations have been solved by Runge-Kutta fourth order method along with shooting technique. The influence of magnetic parameter M, permeability parameter K, buoyancy or mixed convection parameter λ, suction parameter S, slip parameter δ and Prandtl number Pr has been studied. It is found that these parameters have essential effects on the features of flow and heat transfer. Further, the present solutions are also validated by comparing with the existing solutions. Page(s): 400-405

Dielectric relaxation properties of aqueous dimethylamine, trimethylamine and ethylamine using time domain reflectometry technique

Sat, 01 Jun 2019 00:00:00 GMT

Title: Dielectric relaxation properties of aqueous dimethylamine, trimethylamine and ethylamine using time domain reflectometry technique Authors: Deshmukh, A R; Ingole, S A; Shinde, R V; Lokhande, M P; Kumbharkhane, A C Abstract: The complex permittivity spectra of dimethylamine (40 wt. % in water), trimethylamine (30 wt. % in water) and ethylamine (70 wt. % in water) have been obtained at different temperature using time domain reflectometry technique in the frequency range of 10 MHz-50 GHz. The relaxation mechanism for these systems is described by using Cole-Davidson model. The temperature dependant dielectric relaxation parameters such as static dielectric constant (ε₀), relaxation time (τ) and distribution parameter (β) have been obtained by using non-linear least square fit method. The extracted static dielectric constant (ε₀) and relaxation time (τ) values have been used to calculate thermodynamic parameter and Kirkwood correlation factor (g^eff). The enthalpy of activation ∆_actH suggests that chemical kinetic is exothermic. Entropy of activation ∆_actS suggests that the system is less ordered and Gibbs free energy of activation ∆_actG reveals the molecular reorientation for all the three systems. Kirkwood factor for DMA40, TMA30 and EA70 is greater than unity which confirms the hydrogen bond interaction and parallel orientation of dipoles in molecules. Page(s): 406-410