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Convection Heat and Mass Transfer in a Power Law Fluid with Non Constant Relaxation Time Past a Vertical Porous Plate in the Presence of Thermo and Thermal Diffusion

. International Journal of Computational Methods in Engineering Science and Mechanics, 11 (2010), No. 2, 100-108. [20] Olajuwon, B. I. Flow and Natural Convection Heat Transfer in a Power Law Fluid Past a Vertical Plate with Heat Generation. International Journal of nonlinear Sciences, 7 (2010), No. 1, 50-56. [21] Olajuwon, B. I. Convection Heat and Mass Transfer in a Power Law Fluid with Heat Generation and Thermal Diffusion Past a Vertical Plate. Journal of Energy, Heat and Mass Transfer, 30 (2008), No. 1, 1-19. [22] Olajuwon, B

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MHD natural convection flow with radiative heat transfer past an impulsively moving vertical plate with ramped temperature in the presence of hall current and thermal diffusion

Abstract

An investigation on an unsteady MHD natural convection flow with radiative heat transfer of a viscous, incompressible, electrically conducting and optically thick fluid past an impulsively moving vertical plate with ramped temperature in a porous medium in the presence of a Hall current and thermal diffusion is carried out. An exact solution of momentum and energy equations, under Boussinesq and Rosseland approximations, is obtained in a closed form by the Laplace transform technique for both ramped temperature and isothermal plates. Expressions for the skin friction and Nusselt number for both ramped temperature and isothermal plates are also derived. The numerical values of fluid velocity and fluid temperature are displayed graphically versus the boundary layer coordinate y for various values of pertinent flow parameters for both ramped temperature and isothermal plates. The numerical values of the skin friction due to primary and secondary flows are presented in tabular form for various values of pertinent flow parameters.

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Effects of Thermal Diffusion and Viscous Dissipation on Unsteady MHD Free Convection Flow Past a Vertical Porous Plate Under Oscillatory Suction Velocity with Heat Sink

-2311. Hossain M.A. and Mandal A.C. (2007): Effects of mass transfer and free convection on the unsteady MHD flow past a vertical porous plate with constant suction. - Int. J. Energy Research., vol.10, pp.409-416. Prabhakar Reddy B. and Anand Rao J. (2011): Numerical solution of thermal diffusion effect on an unsteady MHD free convective mass transfer flow past a vertical porous plate with Ohmic dissipation. - Int. J. Appl. Math and Mech., vol.7(8), pp.78-97. Prabhakar Reddy B. and Anand Rao J. (2011): Radiation and thermal diffusion effects on

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Numerical Solutions by EFGM of MHD Convective Fluid Flow Past a Vertical Plate Immersed in a Porous Medium in the Presence of Cross Diffusion Effects via Biot Number and Convective Boundary Condition

radiation and Hall current . – Procedia Eng. J., vol.127, pp.1330–1337. [14] Srinivasa Raju R., Mahesh Reddy B., Rashidi M.M. and Gorla R.S.R. (2016): Application of finite element method to unsteady MHD free convection flow past a vertically inclined porous plate including thermal diffusion and diffusion thermo effects . – J. Porous Media (In Press). [15] Nejad M.M., Javaherdeh K. and Moslemi M. (2015): MHD mixed convection flow of power law non-Newtonian fluids over an isothermal vertical wavy plate. – J. Magn. Magn. Mater., vol.389, pp.66–72. [16

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Influence of soret effect on mhd mixed convection flow of visco-elastic fluid past a vertical surface with hall effect

References Aboeldahab E.M. and Elbarbay E.M.E. (2001): Hall current effect on MHD free convection flow past a semi-infinite vertical plate with mass transfer. - Int. J. Eng. Sci., vol.39, p.64. Acharya M., Dash G.C. and Singh P.L. (2001): Hall effect simultaneous thermal and mass diffusion on unsteady hydromagnetic flow near an accelerated vertical plate. - Ind. J. Physics B, vol.75 (1), p.168. Acharya M., Dash G.C. and Singh P.L. (2001): Effect of chemical and thermal diffusion with Hall current on unsteady

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Unsteady MHD Thermal Diffusive and Radiative Fluid Flow Past a Vertical Porous Plate with Chemical Reaction in Slip Flow Regime

. – J. Engg. Math., vol.10, pp.41-54. [21] Raju M.C., Varma S.V.K. and Reddy N.A. (2011): MHD thermal diffusion natural convection flow between heated inclined plates in porous medium . – Journal on Future Engineering and Technology, vol.6, No.2, pp.45-48. [22] Raju M.C., Varma S.V.K. and Reddy N.A. (2012): Radiation and mass transfer effects on a free convection flow through a porous medium bounded by a vertical surface. – Journal of Future Engineering and Technology, vol.7, No.2, pp.7-12. [23] Raju M.C., Varma S.V.K., Reddy P.V. and Sumon Saha

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Nonlinear Thermodiffusion in Gases at Moderate Temperatures

Abstract

The paper discusses the properties of the nonlinear thermodiffusion equation corresponding to the diffusion processes, which occur with a finite velocity. In the previous papers, A. J. Janavičius proposed the nonlinear diffusion equation with the diffusion coefficient directly proportional to the concentration of impurities. This equation provides a more exact description of the profiles of impurities in Si crystals. The heat transfer in gases carries a greater average kinetic energy based on nonlinear diffusion of gas molecules from hot regions to the coldest ones with a finite velocity by random Brownian motions. In this case, the heat transfer in gases can be described by using nonlinear thermodiffusion equation with heat transfer and thermodiffusion coefficients directly proportional to temperature T. The obtained approximate analytical solutions are successfully applied in defining temperature profiles and heat transfer coefficients in gases as well as providing opportunities for practical applications. It has been concluded that heat spreading in gases depends on temperature differences and pressure in gases.

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Thermal Properties of a New Pavement Material for Using in Road Construction

Abstract

The paper presents the results from a study of the thermo-physical properties of a new synthetic acrylic polymer used as material in road construction and as concrete on its basis. For the purposes of the study, the Modified Transient Plane Source Method (MTPS) was used. Data on the following thermal characteristics were obtained: thermal conductivity coefficient, thermal effusion, thermal diffusion and specific thermal capacity. A comparative analysis was made with the analogous indicators of conventional petroleum bitumen and asphalt concrete. The results of the study can be used for a more precise calculation and prognosis of temperature deformations and thermal stresses, as well as the crack propensity at low temperatures in asphalt concretes.

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Axisymmetric mixed convective MHD flow over a slender cylinder in the presence of chemically reaction

Abstract

The present analysis is focused on the study of the magnetic effect on coupled heat and mass transfer by mixed convection boundary layer flow over a slender cylinder in the presence of a chemical reaction. The buoyancy effect due to thermal diffusion and species diffusion is investigated. Employing suitable similarity transformations, the governing equations are transformed into a system of coupled non-linear ordinary differential equations and are solved numerically via the implicit, iterative, second order finite difference method. The numerical results obtained are compared with the available results in the literature for some special cases and the results are found to be in excellent agreement. The velocity, temperature, and the concentration profiles are presented graphically and analyzed for several sets of the pertinent parameters. The pooled effect of the thermal and mass Grashof number is to enhance the velocity and is quite the opposite for temperature and the concentration fields.

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Study on the Use of Aerogel on the Surface of Basalt Fabric

Abstract

The layer of aerogel was applied to the surface of basalt fabric due to the possibility of improving a fabric protecting against the influence of hot environmental factors. The analysis of aerogel surface roughness and thickness of the obtained sample, resistance to contact heat for the contact temperature between 100°C and 250°C, and tests of resistance to the penetration of thermal radiation were carried out. In addition, thermal conductivity, thermal resistance, thermal diffusion, thermal absorption, and surface roughness were determined. The obtained results indicate the unevenness of aerogel application on the surface of basalt fabric. For this reason, work should be carried out on an appropriate technology that will allow them to be applied evenly on the surface of the fabric. The parameters tested and the results obtained are promising in terms of the possibility of using the fabric obtained in protective gloves.

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