http://www.i-scholar.in/index.php/JGSI/article/download/70750/61283

Records of the Geological Survey of India

Effects of suction/blowing on steady boundary layer stagnation-point flow and heat transfer towards a shrinking sheet with thermal radiation

Evaluation of excessive lifetime cancer risk due to natural radioactivity in the rivers sediments of Northern Pakistan

The steady boundary layer flow of nanofluid over an exponential stretching surface is investigated analytically. The transport equations include the effects of Brownian motion parameter and thermophoresis parameter. The highly nonlinear coupled partial differential equations are simplified with the help of suitable similarity transformations. The reduced equations are then solved analytically with the help of homotopy analysis method (HAM). The convergence of HAM solutions are obtained by plotting h-curve. The expressions for velocity, temperature and nanoparticle volume fraction are computed for some values of the parameters namely, suction injection parameter α, Lewis number Le, the Brownian motion parameter Nb and thermophoresis parameter Nt.

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Boundary layer flow of nanofluid over an exponentially stretching surface

In the present investigation we have analyzed the boundary layer flow of a Jeffrey fluid over an exponentially stretching surface. The effects of thermal radiation are carried out for two cases of heat transfer analysis known as (1) Prescribed exponential order surface temperature (PEST) and (2) Prescribed exponential order heat flux (PEHF). The highly nonlinear coupled partial differential equations of Jeffrey fluid flow along with the energy equation are simplified by using similarity transformation techniques based on boundary layer assumptions. The reduced similarity equations are then solved analytically by the homotopy analysis method (HAM). The convergence of the HAM series solution is obtained by plotting $\hbar$ -curves for velocity and temperature. The effects of physical parameters on the velocity and temperature profiles are examined by plotting graphs.

Effects of thermal radiation on the boundary layer flow of a Jeffrey fluid over an exponentially stretching surface

Evaluation of excess life time cancer risk from gamma dose rates in Jhelum valley

This article addresses the unsteady three-dimensional flow of second grade nanofluid due to thermophoresis and Brownian motion effects. The flow is generated due to unsteady stretching in two lateral directions. The zero nanoparticles mass flux boundary conditions are imposed to find the desired solutions. By introducing the dimensionless variables the governing system of partial differential equations are transformed into the system of ordinary differential equations. Series solutions of the transformed ordinary differential equations are computed. Solutions are carried out for dimensionless temperature and nanoparticles concentration. The behavior of physical parameters on the temperature and nanoparticles concentrations is examined through graphs and tabular data. The temperature and concentration distribution at the surface are also computed and analyzed. It can be noted that both the temperature and nanomaterial are reduced for higher values of unsteadiness parameter. It is also observed that the friction factor of second grade fluid parameter is less compared with viscous nanofluid.

Time-dependent 3D flow of viscoelastic nanofluid over an unsteady stretching surface

Bi-directional unsteady flow of nanomaterial has been explored in the existence of Cattaneo-Christov double diffusion. Brownian motion, thermophoresis and heat sources namely PST (prescribed surface temperature) and PHF (prescribed heat flux) are included. The obtained nonlinear systems are computationally solved by employing Keller box method. Graphs have been created for temperature and concentration fields for distinct amounts of involved parameters. Tables have been generated and discussed for skin friction, heat and mass transfer rates. It is assessed that temperature and concentration are reducing fields of thermal and relaxation factors for prescribed heat flux. Obtained effects are linked with the formerly published results and found favorable agreement.

Bi-directional stretched nanofluid flow with Cattaneo-Christov double diffusion

An analysis is carried out to investigate the peristaltic pumping of a non-Newtonian Ellis fluid in a planar channel. The coupled nonlinear partial differential equations governing the problem are simplified under the widely used assumption of long wavelength and low Reynolds number. A semi- analytical approach is adopted to obtain the expressions for stream function, longitudinal velocity, pressure gradient and pressure rise per wavelength. The important characteristics of the peristaltic motion are explained graphically for several values of the material parameter of the Ellis fluid.

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Iftikhar Ahmad

Papers

Evaluation of excess life time cancer risk from gamma dose rates in Jhelum valley

Time-dependent 3D flow of viscoelastic nanofluid over an unsteady stretching surface

Bi-directional stretched nanofluid flow with Cattaneo-Christov double diffusion

Channel flow of Ellis fluid due to peristalsis

Dynamisms of solar radiation and prescribed heat sources on bidirectional flow of magnetized Eyring-Powell nanofluid