Heat transfer and entropy generation of natural convection in nanofluid-filled square cavity with partially-heated wavy surface

Cho, Ching-Chang

doi:10.1016/j.ijheatmasstransfer.2014.05.063

Cited by 97 publications

(22 citation statements)

References 38 publications

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“…Entropy generation In the studied problem, the irreversibility is generated through heat transfer, fluid friction and mass transfer. As a result, the total entropy is the sum of the irreversibilities due to thermal gradients, viscous dissipation and concentration gradients as follows [6][7][8][9][10][11]:…”

Section: Dimensional Equationsmentioning

confidence: 99%

“…Mchirgui et al [10] performed a numerical investigation of entropy generation in steady-unsteady double diffusive convection through an inclined porous enclosure using the Control Volume Finite-Element. Cho [11] conducted a numerical investigation into the heat transfer performance and entropy generation of natural convection in a partially-heated wavy-wall square cavity filled with Al 2 O 3 -water nanofluid.…”

Section: Introductionmentioning

confidence: 99%

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FDLBM simulation of entropy generation in double diffusive natural convection of power-law fluids in an enclosure with Soret and Dufour effects

Kefayati

2015

International Journal of Heat and Mass Transfer

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Section: Dimensional Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FDLBM simulation of entropy generation in double diffusive natural convection of power-law fluids in an enclosure with Soret and Dufour effects

Kefayati

2015

International Journal of Heat and Mass Transfer

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“…Magnetic field effects are recently used with nanofluids [26][27][28][29]. The technology of nanofluids were successfully implemented in various technological applications related to thermal science such as in solar power, thermal energy storage, refrigeration, thermal management and convective heat transfer control [30][31][32][33][34][35][36][37]. Convective heat transfer in 3D cavities with nanofluid considering magnetic field effects were performed by several researchers [38,39].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Rotating Cone on the Mixed Convection in a Double Lid-Driven 3D Porous Trapezoidal Nanofluid Filled Cavity under the Impact of Magnetic Field

2020

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Effects of a rotating cone in 3D mixed convection of CNT-water nanofluid in a double lid-driven porous trapezoidal cavity is numerically studied considering magnetic field effects. The numerical simulations are performed by using the finite element method. Impacts of Richardson number (between 0.05 and 50), angular rotational velocity of the cone (between −300 and 300), Hartmann number (between 0 and 50), Darcy number (between 10 − 4 and 5 × 10 − 2 ), aspect ratio of the cone (between 0.25 and 2.5), horizontal location of the cone (between 0.35 H and 0.65 H) and solid particle volume fraction (between 0 and 0.004) on the convective heat transfer performance was studied. It was observed that the average Nusselt number rises with higher Richardson numbers for stationary cone while the effect is reverse for when the cone is rotating in clockwise direction at the highest supped. Higher discrepancies between the average Nusselt number is obtained for 2D cylinder and 3D cylinder configuration which is 28.5% at the highest rotational speed. Even though there are very slight variations between the average Nu values for 3D cylinder and 3D cone case, there are significant variations in the local variation of the average Nusselt number. Higher enhancements in the average Nusselt number are achieved with CNT particles even though the magnetic field reduced the convection and the value is 84.3% at the highest strength of magnetic field. Increasing the permeability resulted in higher local and average heat transfer rates for the 3D porous cavity. In this study, the aspect ratio of the cone was found to be an excellent tool for heat transfer enhancement while 95% enhancements in the average Nusselt number were obtained. The horizontal location of the cone was found to have slight effects on the Nusselt number variations.

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“…Thereafter, several works on entropy generation minimisation have appeared in the literature Woods (1975), Mkwizu and Makinde (2015), Das et al (2015), Makinde and Eegunjobi (2016), Eegunjobi and Makinde (2017a) and Eegunjobi and Makinde (2017b). Entropy generation rate produced by natural circulation in a square cavity filled with Al2O3 nanofluid was numerically studied by Cho (2014). Leong et al (2012) examined the entropy generation rate in three different types of heat exchangers operated with nanofluids.…”

Section: Introductionmentioning

confidence: 99%

MHD couple stress nanofluid flow in a permeable wall channel with entropy generation and nonlinear radiative heat

Makinde

Eegunjobi

2017

JTST

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In this paper, both first and second laws of thermodynamics are employed to examine the combined effects of nonlinear thermal radiation, buoyancy forces, thermophoresis and Brownian motion on entropy generation rate in hydromagnetic couple stress nanofluid flow through a vertical channel with permeable walls. The model equations of momentum, energy balance and nanoparticle concentration are obtained and tackled numerically using a shooting technique coupled with Runge-Kutta-Fehlberg integration scheme. The numerical results for velocity, temperature and nanoparticles concentration profiles are utilised to determine the skin friction, Nusselt number, Sherwood number, entropy generation rate and Bejan number. It is found that the entropy production in the flow system can be effectively minimized by regulating the values of the thermophysical parameters for efficient operation. Some other interesting results are displayed graphically and discussed quantitatively.

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Heat transfer and entropy generation of natural convection in nanofluid-filled square cavity with partially-heated wavy surface

Cited by 97 publications

References 38 publications

FDLBM simulation of entropy generation in double diffusive natural convection of power-law fluids in an enclosure with Soret and Dufour effects

FDLBM simulation of entropy generation in double diffusive natural convection of power-law fluids in an enclosure with Soret and Dufour effects

Effects of a Rotating Cone on the Mixed Convection in a Double Lid-Driven 3D Porous Trapezoidal Nanofluid Filled Cavity under the Impact of Magnetic Field

MHD couple stress nanofluid flow in a permeable wall channel with entropy generation and nonlinear radiative heat

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