Entropy generation analysis in MHD mixed convection of hybrid nanofluid in an open cavity with a horizontal channel containing an adiabatic obstacle

Hussain, Shafqat; Ahmed, Sameh E.; Akbar, Tanvir

doi:10.1016/j.ijheatmasstransfer.2017.06.135

Cited by 202 publications

(71 citation statements)

References 37 publications

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“…52 ) In order to validate our code, the numerical value of the Nusselt number and skin friction coefficient presented by Dogonchi et al 48 and Mustafa et al 53 are successfully reproduced. The comparison of the values of the Nusselt number and skin friction coefficient has been shown in the Table II which shows an excellent agreement.…”

Section: Solution Methodologymentioning

confidence: 87%

Numerical study focusing on the entropy analysis of MHD squeezing flow of a nanofluid model using Cattaneo–Christov theory

2018

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The present study gives an account of the heat transfer characteristics of the squeezing flow of a nanofluid between two flat plates with upper plate moving vertically and the lower in the horizontal direction. Tiwari and Das nanofluid model has been utilized to give a comparative analysis of the heat transfer in the Cu-water and Al 2 O 3 -water nanofluids with entropy generation. The modeling is carried out with the consideration of Lorentz forces to observe the effect of magnetic field on the flow. The Joule heating effect is included to discuss the heat dissipation in the fluid and its effect on the entropy of the system. The nondimensional ordinary differential equations are solved using the Keller box method to assess the numerical results which are presented by the graphs and tables. An interesting observation is that the entropy is generated more near the lower plate as compared with that at the upper plate. Also, the heat transfer rate is found to be higher for the

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Section: Solution Methodologymentioning

confidence: 87%

Numerical study focusing on the entropy analysis of MHD squeezing flow of a nanofluid model using Cattaneo–Christov theory

2018

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“…The thermal conductivity of hybrid nanofluid was introduced by Hussain et al 40

\begin{matrix} trueleft \\ \frac{K_{nf}}{K_{bf}} & = & true(\frac{{(ϕ}_{({Al}_{2} {normalO}_{3})} K_{({Al}_{2} {normalO}_{3})} {+ ϕ}_{italicCu} K_{italicCu})}{ϕ} + 2 K_{italicbf} + 2 {(ϕ}_{({Al}_{2} {normalO}_{3})} K_{({Al}_{2} {normalO}_{3})} {+ ϕ}_{italicCu} K_{italicCu} true) - 2 ϕ K_{italicbf} true) \\ \times {(\frac{{(ϕ}_{({Al}_{2} O_{3})} K_{({Al}_{2} O_{3})} {+ ϕ}_{Cu} K_{Cu})}{ϕ} + 2 K_{bf} - {(ϕ}_{true({Al}_{2} {normalO}_{3} true)} K_{true({Al}_{2} {normalO}_{3} true)} {+ ϕ}_{Cu} K_{Cu}) + ϕ K_{bf})}^{- 1} . \end{matrix}

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Section: Mathematical Descriptionmentioning

confidence: 99%

Effects of the Caputo fractional derivatives on convective flow in wavy vented enclosures filled with a porous medium using Al₂O₃‐Cu hybrid nanofluids

et al. 2020

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This paper studies the effect of fractional derivatives on the fractional convective flow of hybrid nanofluids in a wavy enclosure that has inlet and outlet parts near the left wall and is filled with a porous medium. The Caputo definition of the fractional derivatives is applied on the partial differential equations governing flow. The complex shape is mapped to a rectangular domain using appropriate transformations. The finite difference method is used to solve the resulting system. The results showed that an increase in order of the fractional derivatives causes a low activity of the fluid flow and a reduction in the rate of heat transfer. Also, an increase in the nanoparticles volume fractions reduces the activity of the fluid flow and, as a result, the rate of heat transfer is diminished. An enhancement in fluid motion and rate of the heat transfer is obtained by increasing the amplitude of the wavy wall.

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“…However, few investigations have dealt with mixed convection flow of hybrid nanofluid in open cavities, which makes it a still fertile research area. These include the numerical investigations of [5][6][7]. It is worth mentioning that these studies involved cavities of regular geometries, while in practice, actual cavities are often in an irregular shapes.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation due to the mixed convection flow of MWCNT−MgO/water hybrid nanofluid in a vented complex shape cavity

et al. 2020

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This paper reports a numerical study of mixed convection heat transfer with entropy generation in a vented complex shape cavity filled with MWCNT−MgO (15:85 vol %) /water hybrid nanofluid. A hot source is placed at the mid potion of the inclined plate of the enclosure, while the rest of the rigid walls are adiabatic. A thermo-dependent correlations proposed by [12] for the dynamic viscosity and the thermal conductivity, especially developed for the considered fluid, are used. After validation of the model, the analysis has been done for a Reynolds numbers ranging from 10 to 600 and total nanoparticles volume fraction ranging from 0.0 to 0.02 using the finite volume method. The predicted results of streamlines, isotherms, isentropic lines, average Nusselt number, average entropy generation and average Bejan number are the main focus of interest in the present paper.

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Entropy generation analysis in MHD mixed convection of hybrid nanofluid in an open cavity with a horizontal channel containing an adiabatic obstacle

Cited by 202 publications

References 37 publications

Numerical study focusing on the entropy analysis of MHD squeezing flow of a nanofluid model using Cattaneo–Christov theory

Numerical study focusing on the entropy analysis of MHD squeezing flow of a nanofluid model using Cattaneo–Christov theory

Effects of the Caputo fractional derivatives on convective flow in wavy vented enclosures filled with a porous medium using Al₂O₃‐Cu hybrid nanofluids

Entropy generation due to the mixed convection flow of MWCNT−MgO/water hybrid nanofluid in a vented complex shape cavity

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Entropy generation analysis in MHD mixed convection of hybrid nanofluid in an open cavity with a horizontal channel containing an adiabatic obstacle

Cited by 202 publications

References 37 publications

Numerical study focusing on the entropy analysis of MHD squeezing flow of a nanofluid model using Cattaneo–Christov theory

Numerical study focusing on the entropy analysis of MHD squeezing flow of a nanofluid model using Cattaneo–Christov theory

Effects of the Caputo fractional derivatives on convective flow in wavy vented enclosures filled with a porous medium using Al2O3‐Cu hybrid nanofluids

Entropy generation due to the mixed convection flow of MWCNT−MgO/water hybrid nanofluid in a vented complex shape cavity

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Effects of the Caputo fractional derivatives on convective flow in wavy vented enclosures filled with a porous medium using Al₂O₃‐Cu hybrid nanofluids