Natural Convection Flow of Heat Generating/Absorbing Fluid near a Vertical Plate with Ramped Temperature

Jha, Basant K.; Samaila, Ahmad K.; Ajibade, Abiodun O.

doi:10.4236/jeas.2012.24009

Cited by 15 publications

(12 citation statements)

References 12 publications

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“…He also proposed a correlation for the determination of the thermal conductivity of alumina nanofluids based on the experimental data. Though several attempts have been made on nanofluids to explain the physical reasons for the heat transfer enhancement [13,14], there are still many conspicuous inconsistencies and the investigators are working on, see for example some recent attempts in [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

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confidence: 99%

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Radiation and heat generation effects in magnetohydrodynamic mixed convection flow of nanofluids

Gul¹,

Khan²,

Shafie³

2018

Therm sci

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Radiation and heat generation effects in unsteady magnetohydrodynamic mixed convection flow of nanofluids along a vertical channel are investigated. Silver nanoparticles of spherical shapes and of different sizes in water as a convectional base fluid are incorporated. The purpose of this study is to measure the effect of different sizes of nanoparticles on velocity and temperature. Keeping in mind the size, particle material, shape, clustering and Brownian motion of nanoparticles, Koo and Kleinstreuer model is used. The problem is modeled in terms of partial differential equations with physical boundary conditions. Analytical solutions are obtained for velocity and temperature, plotted and discussed. It is concluded that increasing the size of Ag nanoparticles (up to specific size, 30 nm, results in a very small velocity increment while for large particle size (30-100 nm), no change in velocity is observed. As the small size of nanoparticles has the highest thermal conductivity and viscosity. This change in velocity with size of nanoparticles is found only in water-based nanofluids with low volume fraction 0.01 while at low volume concentration, no change is observed.

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confidence: 99%

“…Channel is taken along x-axis and y-axis is taken normal to the flow direction. After using approximation of Boussinesq and taking into consideration the above assumptions, the governing equations of momentum and energy are obtained [31,32]:…”

Section: Problem Formulation and Solutionmentioning

confidence: 99%

Radiation and heat generation effects in magnetohydrodynamic mixed convection flow of nanofluids

Gul¹,

Khan²,

Shafie³

2018

Therm sci

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“…The possibility of a reduction of entropy generation in a viscous convection cooling system has been reported for a double face structure [9,14,16]. Several analyses have been conducted on the irreversibility of the entropy generation as a result of reactive flow in a channel [17][18][19][20][21][22][23][24][25][26][27]. Collocation method has likewise been used to obtain heat generation force of convective flow through permeable walls.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer in an unsteady vertical porous channel with injection/suction in the presence of heat generation

Obalalu

Wahaab

Adebayo

2020

Journal of Taibah University for Science

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This paper studies convective heat transfer in an unsteady vertical porous channel with suction/injection in the presence of heat generation. A semi-implicit finite difference method was employed to solve the Cartesian coordinate forms of the governing equations. Subsequently, the entropy generation number for varying values of intrinsic parameters, as well as the temperature and velocity profile, Bejan number and irreversibility of the system were successfully calculated. We observed that the convective cooling by suction is more effective on thermal properties than injection convective cooling. Hence, the process of entropy can be enhanced by convective heat transfer and viscous dissipation. ARTICLE HISTORY

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“…Later Seth et al 27 extended the work of Seth et al 26 to include the effect of rotation. Jha et al 28 studied natural convection flow of a heat generating or absorbing fluid near a vertical plate with ramped temperature and considered two cases; a plate with continuous ramped temperature and the other with isothermal temperature. They concluded that the isothermal case is always higher than the ramped case.…”

Section: Introductionmentioning

confidence: 99%

Impact of relative motion of a magnetic field on unsteady magnetohydrodynamic natural convection flow with a constant heat source/sink

Lawal

Jibril

2020

Heat Trans

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This study analyzes time-dependent magnetohydrodynamics natural convective flow of a viscous incompressible fluid in an annulus with ramped motion of the boundaries. The governing momentum and energy equations are solved analytically, in terms of the modified Bessel function of the first and second kinds. The influence of governing parameters such as the Hartman number, radius ratio, Grashof number, heat absorption parameter, and Prandtl number are discussed with the help of line graphs. It is found that the Hartmann number has a retarding effect on fluid velocity when K = 0.0 and K = 0.5, while the reverse effect is noticed when K = 1.0. The Hartman number also decreases the mass flow rate for all cases of K while it enhances the skin friction at the inner surface of the outer cylinder. It increases the skin friction at the outer surface of the inner cylinder when K = 1.0 and K = 0.0, but decreases the skin friction at the outer surface of the inner cylinder when K = 0.5.

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Natural Convection Flow of Heat Generating/Absorbing Fluid near a Vertical Plate with Ramped Temperature

Cited by 15 publications

References 12 publications

Radiation and heat generation effects in magnetohydrodynamic mixed convection flow of nanofluids

Radiation and heat generation effects in magnetohydrodynamic mixed convection flow of nanofluids

Heat transfer in an unsteady vertical porous channel with injection/suction in the presence of heat generation

Impact of relative motion of a magnetic field on unsteady magnetohydrodynamic natural convection flow with a constant heat source/sink

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