Mixed Convective Heat Transfer in a Lid-Driven Concentric Trapezoidal Enclosure: Numerical Simulation

Olayemi, Olalekan Adebayo; Al‐Farhany, Khaled; Ibitoye, Segun E.; Obalalu, Adebowale Martins

doi:10.4028/p-kybe41

Cited by 8 publications

(6 citation statements)

References 55 publications

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“…The flow field within the annulus is depicted by streamlines, which are derived from the velocity components (U and V ) as follows [52]:…”

Section: Computation Of the Stream Functionmentioning

confidence: 99%

Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder

Olayemi,

Ajide,

Obalalu

et al. 2023

Scientia Iranica

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The current investigation uses the finite element method to analyze the natural convective flow of Casson fluid around a tilted hot rectangular cylinder placed in a square container. The influence of Casson fluid parameter    , aspect ratio, () AR , angle of tilt ()  , and Rayleigh number   Ra on isotherms and fluid flow pattern is enunciated. The walls of the enclosure and that of the cylinder are respectively fixed as c T and h T . Results from the findings reveal that for the range of Casson fluid parameter   0.1 1.0   , aspect ratio   0.1 0.7 AR  , and Rayleigh number   36 10 10 Ra , investigated, the rate of heat transfer of the enclosure wall increases with increasing , AR and Ra , while for the heated rectangular obstacle, the rate of heat transfer decreases with AR growth but improves with the growth of  and Ra . At 6 10 Ra  , improvement in  results in heat transfer enhancement for both the enclosure and cylinder walls. However, for Ra in the interval of 35 10 10 Ra , the response of the thermal profiles of both the rectangular cylinder and enclosure walls to cylinder orientation depends on the values of Ra and  considered.

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“…The flow field within the annulus is depicted by streamlines, which are derived from the velocity components (U and V ) as follows [52]:…”

Section: Computation Of the Stream Functionmentioning

confidence: 99%

Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder

Olayemi,

Ajide,

Obalalu

et al. 2023

Scientia Iranica

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“…Generally, the modified temperature-dependent variable properties model is used to define the characteristics of non-Newtonian and Newtonian fluids (see Eq. ( 1) [29,30]…”

Section: (Ii)mentioning

confidence: 99%

Scrutinization of Solar Thermal Energy and Variable Thermophysical Properties Effects on Non-Newtonian Nanofluid Flow

Obalalu

Olayemi

Olakunle

et al. 2023

JERA

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Nanofluids generate high values of convection heat transfer coefficients, low specific heat, and density, which improve the solar thermal energy performance by making it work effectively. By utilizing nanotechnology and solar thermal radiation, the modern world is moving in the direction of new technologies. Therefore, this research is communicated to explore the significance of solar thermal energy, variable properties on non-Newtonian nanofluid flow. However, to exemplify the fluid transport features of the Casson nanofluid (CF), the Buongiorno nanofluid model was utilized. Also, the Lie-group technique is used in the framework to develop similarity variables that will be used to reduce the number of independent variables in partial differential equations (PDEs) and is solved numerically by using the weighted residual Galerkin method (WRGM). The graphical findings revealed that when the variable viscosity parameter is increased, the fluid temperature decreases, while the presence of the solar radiation parameter has the opposite impact. Additionally, when the non-Newtonian parameter approaches infinity, the Casson fluid obeys the viscosity law. The report of this study will be of benefit to thermal and chemical engineering for nanotechnology advancement. KEYWORD: Solar Thermal Energy, Nanofluids, Non-Newtonian, weighted residual Galerkin method (WRGM).

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“…The motion of the fluid is reckoned with the aid of stream function (Ψ), which is calculated from streamline contours that represent the flow fields within the cavity and is formed by making use of the components of velocities U and V as follows: [48][49][50][51]…”

Section: Stream Functionmentioning

confidence: 99%

Numerical Analysis of Natural Convection in a Concentric Trapezoidal Enclosure Filled with a Porous Medium

Olayemi

Isiaka

Al‐Farhany

et al. 2022

JERA

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Numerical study of natural convection around a heated trapezoidal block of different sizes located centrically in a larger trapezium has been investigated. The annulus between the trapeziums is filled with porous media. The sides of the inner trapezium are heated to a fixed temperature (T_h), and the slanted walls of the outer trapezium are adiabatic while its upper and lower walls are heated to temperatures of 〖T_c+(T_h-T_c)sin〗⁡(πx⁄L) and 〖T_h+(T_h-T_c)sin〗⁡(πx⁄L) respectively. The finite element numerical approach was used to solve the relevant dimensionless equations. Results are gotten for salient parameters including; modified Rayleigh number (10≤Ra_m≤ 1000), Darcy number (10^(-5)≤Da≤ 10^(-2)), and area ratio (1/5≤AR≤ 1/3). The results of this study are shown as isothermal contours, stream functions, and average Nusselt number. The results show that increasing Ra_m improves heat transfer; however, the response of thermal characteristics to AR increment depends on the range of Darcy number considered. Results from this study find application in ingot treatments and microchannel cooling among others.

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Mixed Convective Heat Transfer in a Lid-Driven Concentric Trapezoidal Enclosure: Numerical Simulation

Cited by 8 publications

References 55 publications

Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder

Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder

Scrutinization of Solar Thermal Energy and Variable Thermophysical Properties Effects on Non-Newtonian Nanofluid Flow

Numerical Analysis of Natural Convection in a Concentric Trapezoidal Enclosure Filled with a Porous Medium

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