Conjugate heat transfer of laminar mixed convection of a nanofluid through a horizontal tube with circumferentially non-uniform heating

Allahyari, Sh.; Behzadmehr, A.; Sarvari, S. M. Hosseini

doi:10.1016/j.ijthermalsci.2011.03.025

Cited by 31 publications

(16 citation statements)

References 24 publications

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“…Also, this figure shows that the value of C f does not vary noticeably by increasing the particle weight fractions. The same conclusions were made in some other studies [12,[14][15][16].…”

Section: Validation Of the Experimental Facilitysupporting

confidence: 88%

Rheological Characteristics, Pressure Drop, and Skin Friction Coefficient of MWCNT–Oil Nanofluid Flow Inside an Inclined Microfin Tube

Derakhshan

Akhavan-Behabadi

Ghazvini

2015

Heat Transfer Engineering

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Rheological behavior, pressure drop, and skin friction coefficient of multiwalled carbon nanotubes (MWCNT)-oil nanofluid were investigated experimentally. Plain and microfin tubes were used as the test tubes under constant heat flux boundary conditions. Pure heat transfer oil and nanofluuids with particle weight concentrations of 0.05%, 0.1%, and 0.2% were utilized as the working fluuids. Shear stress, shear rate, and viscosity of base fluuid of all nanofluuids at different temperatures were measured and the effect of nanoparticle concentration on fluuid properties was investigated. Furthermore, effects of nanoparticles concentration, heat flux, natural convection, and inclination on pressure drop and skin friction coefficient were studied for Grashof number ranging from 10 3 to 10 4 , Reynolds number ranging from 10 to 150, and particle weight concentrations up to 0.2%. Results showed that pressure drop and skin friction increased as inclination was increased from 0 to 90 degrees. Results also showed that the effect of addition of nanoparticles on pressure drop in a plain tube is more compared to the microfin one. At the end, a correlation was developed to calculate the skin friction coefficient in different inclinations and nanoparticle weight fractions.

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“…Also, this figure shows that the value of C f does not vary noticeably by increasing the particle weight fractions. The same conclusions were made in some other studies [12,[14][15][16].…”

Section: Validation Of the Experimental Facilitysupporting

confidence: 88%

Rheological Characteristics, Pressure Drop, and Skin Friction Coefficient of MWCNT–Oil Nanofluid Flow Inside an Inclined Microfin Tube

Derakhshan

Akhavan-Behabadi

Ghazvini

2015

Heat Transfer Engineering

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“…Heat transfer coefficient is enhanced with the volume fraction as well as the Richardson number. Further they verified that similar trend exists for horizontal tube also [30].…”

Section: Introductionsupporting

confidence: 59%

Conjugate Heat Transfer from Sudden Expansion Using Nanofluid

Kanna

Taler

Anbumalar

et al. 2014

Numerical Heat Transfer, Part A: Applications

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Conjugate heat transfer from sudden expansion using nanofluid is studied numerically. The governing equations are solved using unsteady stream function-vorticity formulation method. Results are compared with zero nanoparticle fluid to exhibit the role of nanoparticle. The effect of volume fraction of nanoparticles and type of nanoparticles on heat transfer are examined and found to have a significant impact. Local Nusselt number and average Nusselt number are reported in connection with various nanoparticle, volume fraction, and Reynolds number for expansion ratio 2. Two dimensionality is more pronounced in the solid wall up to recirculation length. Local Nusselt number reaches peak values near the reattachment point and reaches asymptotic value in the downstream. Bottom wall eddy and volume fraction show significant impact on average Nusselt number. The wall thickness causes larger temperature gradient at the conjugate interface boundary, which leads to larger average Nusselt number.

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“…Considering that the Reynolds number is the ratio of inertial forces to viscosity forces, with constant volume fraction of the nanoparticles and thus constant viscosity forces, increase or decrease of the Reynolds number will increase or decrease the inertial forces. On the other hand, the Richardson number was defined as the ratio of the Grashof number to the square of Reynolds number in reference [20] and [38]. According to the reference [37], if the above ratio is (Gr/Re 2 ≪1), there will be forced convection heat transfer and we can neglect the effect of natural convection.…”

Section: Comparison Of the Axial Evolution Of Nu In A Horizontal Tubementioning

confidence: 99%

Numerical Study of the Effect of the Reynolds Numbers on Thermal and Hydrodynamic Parameters of Turbulent Flow Mixed Convection Heat Transfer in an Inclined Tube

Vahidinia¹,

Miri²

2015

SV-JME

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A numerical investigation of the effect of the Reynolds number on the thermal and hydrodynamic parameters of mixed convection heat transfer of the water-Al 2 O 3 nanofluid turbulent flow in an inclined circular channel is the subject of this article. The upper wall of the channel was under non-uniform heat flux and its lower part was isolated. The two-phase mixture model, the finite volume method, and the secondorder upstream difference scheme were used to solve the governing equations. After reviewing the results, it was found that by increasing Reynolds number, the convective heat transfer coefficient and shear stress increase, but the surface friction coefficient decreases. In the case of Nusselt number and the surface friction coefficient, some equations were extracted.

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Conjugate heat transfer of laminar mixed convection of a nanofluid through a horizontal tube with circumferentially non-uniform heating

Cited by 31 publications

References 24 publications

Rheological Characteristics, Pressure Drop, and Skin Friction Coefficient of MWCNT–Oil Nanofluid Flow Inside an Inclined Microfin Tube

Rheological Characteristics, Pressure Drop, and Skin Friction Coefficient of MWCNT–Oil Nanofluid Flow Inside an Inclined Microfin Tube

Conjugate Heat Transfer from Sudden Expansion Using Nanofluid

Numerical Study of the Effect of the Reynolds Numbers on Thermal and Hydrodynamic Parameters of Turbulent Flow Mixed Convection Heat Transfer in an Inclined Tube

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