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

Obalalu, Adebowale Martins; Wahaab, Fatai Adisa; Adebayo, Lawal Lanre

doi:10.1080/16583655.2020.1748844

Cited by 32 publications

(26 citation statements)

References 29 publications

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“…This can be ascribed to the existence of Lorentz force which serves as a resisting force to the fluid flow. Hence, it slows down the fluid velocity, meanwhile its propensity to suppresses and decelerate the CF motion Obalalu et al(2020). It can be seen from Fig.…”

Section: Resultsmentioning

confidence: 91%

“…where 1 N represent the irreversibility outcome from heat transfer, 2 N represent entropy generation due to the viscous dissipation magnetic field (Obalalu et al 2020), and  is described as the rate of entropy generated due to fluid friction. The heat irreversibility is controlled at 1 Be  and 0 Be  when viscous dissipation is the dominant contributor to entropy generation, whereas 0.5 Be  is assigned to contribute equally.…”

Section: Mathematical Analysismentioning

confidence: 99%

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Numerical Simulation of Entropy Generation for Casson Fluid Flow Through Permeable Walls and Convective Heating With Thermal Radiation Effect

Obalalu¹,

Issa²,

Abdulraheem³

et al. 2020

JSSCM

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In this work, the influence of entropy generation analysis for an electrically conducting Casson fluid flow with convective boundary conditions has been numerically studied. The governing equations are analyzed numerically using weighted residual methods. Subsequently, the residuals were minimized using two different approaches of weighted residual method namely collocation weighted residual method (CWRM) and Galerkin weighted residual method (GWRM) and computed numerically using MATHEMATICAL software. The impacts of governing parameters on Casson flow velocity, temperature profile, local skin friction, and Nusselt number were analysed. The obtained solutions were used to determine the heat transfer irreversibility and bejan number of the model. The results of the computation show that the effect of thermophysical properties such as thermal radiation parameter, suction/injection parameter, magnetic field parameter, radiation parameter, and Eckert number has a significant influence on Skin friction coefficient (Cf) and local Nusselt number (Nu) when compared to the Newtonian fluid. The findings from this study are relevant to advances in viscoelasticity and enhanced oil recovery.

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Section: Resultsmentioning

confidence: 91%

Section: Mathematical Analysismentioning

confidence: 99%

Numerical Simulation of Entropy Generation for Casson Fluid Flow Through Permeable Walls and Convective Heating With Thermal Radiation Effect

Obalalu¹,

Issa²,

Abdulraheem³

et al. 2020

JSSCM

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“…This represented the physical case that, more thermal energy is given by Eckert, as heat is driven from the plate (see Figure 3C). The effect of magnetic field strength on the temperature profile can be attributed as an additional heat source inside the channel by Lorentz heating 17,36 . The Hartmann number's rising value accelerates the fluid temperature in the flow domain, while the viscous parameter decreases the fluid thermal profiles.…”

Section: Validation Computational Results and Discussionmentioning

confidence: 99%

“…The work of Srinivasulu and Goud 15 presented their research on non‐Newtonian nanofluid flow in the presence of physical properties. Carreau fluid, 16 Meyers et al 17 highlighted the sensitivity of thermophysical properties on heat and mass transfer analyses. The existence of chemical reactions and the rate of mass diffusion can be effectively modified.…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Obalalu

2021

Heat Trans

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This study investigates the heat and mass transfer in an unsteady squeezing flow between parallel plates under the influence of novel variable diffusivity. In most of the literature, it is believed that the thermophysical properties of the fluid are unchanged. However, this present study bridges this gap by assuming that viscosity, conductivity, and diffusivity are all temperature‐dependent. Physically, an appropriate analysis of thermophysical variables in such a system is required to achieve the best performance for effective heat and mass transfer processes. The equations controlled were first nondimensional and then simplified by a similarity transformation to ordinary nonlinear differential equations. The present study provides a fast convergent method on finite parallel plates, namely, the optimal homotopy analysis method (OHAM) and spectral collocation method (SCM) are used to analyze the fluid flow, heat, and mass transport. The graphical and table understanding is given via an error table and flow behavior of physical parameters. The result reveals that the SCM is more accurate than OHAM. However, the method employed in this paper offers excellent convergence solutions with good accuracy. The solution convergence is also discussed. In this type of problem, squeeze numbers play an important role and the rise in the squeezing parameter increases the fluid temperature.

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“…Majority of these studies arbitrarily select frequencies to achieve their objective of EM heating, not taking into cognizance that EM transmitter efficiency and ensuing EM propagation are largely dependent on the EM properties of the propagating medium. This is essential as the transfer of EM energy to reservoir materials depends on their molecular composition and fluid content [22,23]. As the EM properties of porous media are affected by pore distribution [20], this study first provides a preliminary analysis of the pore diameter distribution in the sampled sandstone (Berea).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of resonant frequency of sandstone saturated with magnetite nanofluid

Wahaab

Adebayo

Ali

et al. 2020

Journal of Taibah University for Science

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Electromagnetic wave is a viable means of introducing energy into reservoirs for the recovery of residual oil. However, previous studies have not considered the precise frequency of the electromagnetic (EM) wave. These studies focused on EM heating, not considering the efficiency dependence of EM transmitter and EM propagation on the EM properties of the medium. Thus, sandstone effective permittivity was experimentally measured, and electrical conductivity calculated for different saturation stages encountered in the nanofluid enhanced oil recovery process. The effective permittivity at the resonant frequency of the sandstone increased from 10.94 to 19.1 with a simultaneous frequency shift from 1.2 to 0.6 GHz due to the inclusion of magnetite nanofluid. This implies that the maximum transfer of EM energy for stimulation and activation of injected nanofluid can be achieved by irradiating the EM wave of this frequency within the reservoir for mobilization of the residual oil.

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

Cited by 32 publications

References 29 publications

Numerical Simulation of Entropy Generation for Casson Fluid Flow Through Permeable Walls and Convective Heating With Thermal Radiation Effect

Numerical Simulation of Entropy Generation for Casson Fluid Flow Through Permeable Walls and Convective Heating With Thermal Radiation Effect

Heat and mass transfer in an unsteady squeezed Casson fluid flow with novel thermophysical properties: Analytical and numerical solution

Experimental investigation of resonant frequency of sandstone saturated with magnetite nanofluid

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