Analytical study of parameters affecting entropy generation of nanofluid turbulent flow in channel and micro-channel

Sheikhzadeh, Ghanbar Ali; Aghaei, Alireza; Ehteram, Hamidreza; Abbaszadeh, Mahmoud

doi:10.2298/tsci151112070s

Cited by 12 publications

(4 citation statements)

References 22 publications

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“…Therefore, due to its determining function on clarifying the quantitative measurement of potential work as well as exergy, entropy generation must be considered in solving convection problems. Numerous researches in the last decade were devoted to the irreversibility analysis in microchannels [13][14][15][16]. Hooman [17] explored the role of entropy generation on the forced convection heat transfer in micro-electro-mechanical systems (MEMS) in the slip-flow regime.…”

Section: Global Journal Of Nanomedicinementioning

confidence: 99%

Second Law Analyses of Forced Convection of Low-Reynolds-Number Slip Flow of Nanofluid Inside a Microchannel with Square Impediments

Abbaszadeh¹

2017

GJN

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In this study, the Finite Volume Method is employed in order to investigate the flow field, heat transfer and entropy generation of forced convection of Al2O3-water nanofluid in a parallel plate microchannel. Four square impediments are placed inside the microchannel to enhance mixing of nanofluid. The governing equations, which are accompanied with the slip velocity and temperature jump boundary conditions, are solved by SIMPLER algorithm. The study is conducted for the Reynolds numbers in the range of 0.1 ≤ Re ≤ 10, Knudsen numbers ranging of 0 ≤ Kn ≤ 0.1 and volume fraction of nanoparticles ranging of 0 ≤ ϕ ≤ 3%. The results show that by increasing the volume fraction of nanoparticles or the Reynolds number, the average Nusselt number and the total entropy generation augment. Furthermore, as the Knudsen number increases, both the average Nusselt number and the total entropy generation rate decrease.

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Section: Global Journal Of Nanomedicinementioning

confidence: 99%

Second Law Analyses of Forced Convection of Low-Reynolds-Number Slip Flow of Nanofluid Inside a Microchannel with Square Impediments

Abbaszadeh¹

2017

GJN

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“…Entropy analysis is an influential means to find the efficiency of a system or process. Limited studies on the entropy generation of turbulent nanofluid flow have been analyzed in the microchannel, stretching sheet and channels; the entropy generation in the microchannel and channel is studied more closely although the studies described can apply to nanofluid, fluid turbulent, or laminar flow [ 3 ]. Some researchers have worked on entropy generation by considering different types of geometry.…”

Section: Introductionmentioning

confidence: 99%

Shape Effect of Nanosize Particles on Magnetohydrodynamic Nanofluid Flow and Heat Transfer over a Stretching Sheet with Entropy Generation

Rashid

Băleanu

Iqbal

et al. 2020

Entropy

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Magnetohydrodynamic nanofluid technologies are emerging in several areas including pharmacology, medicine and lubrication (smart tribology). The present study discusses the heat transfer and entropy generation of magnetohydrodynamic (MHD) Ag-water nanofluid flow over a stretching sheet with the effect of nanoparticles shape. Three different geometries of nanoparticles—sphere, blade and lamina—are considered. The problem is modeled in the form of momentum, energy and entropy equations. The homotopy analysis method (HAM) is used to find the analytical solution of momentum, energy and entropy equations. The variations of velocity profile, temperature profile, Nusselt number and entropy generation with the influences of physical parameters are discussed in graphical form. The results show that the performance of lamina-shaped nanoparticles is better in temperature distribution, heat transfer and enhancement of the entropy generation.

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“…Although many methods, such as using pure nano uids [9][10][11][12], have been introduced to enhance heat transfer in such applications, using the hybrid nano uid is an innovative means which has received striking consideration in the last decade. As early as 1999, Wang et al [13] measured e ective thermal conductivity of mixtures of uids and nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Analytical study of Al2O3-Cu/water micropolar hybrid nanofluid in a porous channel with expanding/contracting walls in the presence of magnetic field

2017

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Abstract. Forced convection uid ow and heat transfer were investigated in a porous channel with expanding or contracting walls, which was lled with Al2O3-Cu/water micropolar hybrid nano uid in the presence of magnetic eld. In order to solve the governing equations analytically, the least square method was employed. The hot bottom wall was cooled by the coolant uid, which was injected into the channel from the top wall. The range of nanoparticles volume fraction (90% Al 2 O 3 and 10% Cu by volume) was between 0% and 2%. The e ects of consequential parameters such as Reynolds number, Hartmann number, micro rotation factor, and nanoparticles volume fraction on velocity and temperature pro les were examined. The results show that with increasing Reynolds number, the values of temperature and micro rotation pro les decrease. Furthermore, when the hybrid nano uid is used, compared to common nano uid, the heat transfer coe cient will increase signi cantly. It is also observed that when the Hartmann number increases, Nusselt number increases, too.

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Analytical study of parameters affecting entropy generation of nanofluid turbulent flow in channel and micro-channel

Cited by 12 publications

References 22 publications

Second Law Analyses of Forced Convection of Low-Reynolds-Number Slip Flow of Nanofluid Inside a Microchannel with Square Impediments

Second Law Analyses of Forced Convection of Low-Reynolds-Number Slip Flow of Nanofluid Inside a Microchannel with Square Impediments

Shape Effect of Nanosize Particles on Magnetohydrodynamic Nanofluid Flow and Heat Transfer over a Stretching Sheet with Entropy Generation

Analytical study of Al2O3-Cu/water micropolar hybrid nanofluid in a porous channel with expanding/contracting walls in the presence of magnetic field

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