Experimental investigation of combined forced and free convection in horizontal and inclined tubes

Barozzi, Giovanni Sebastiano; Zanchini, Enzo; Mariotti, Monica

doi:10.1007/bf02337057

Cited by 62 publications

(39 citation statements)

References 42 publications

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“…Fig. 2 shows the comparison of the calculated results with the experimental results of Barozzi et al [26] in a horizontal tube. Axial evolution of the Nusselt number at different Rayleigh numbers was compared.…”

Section: Numerical Methods and Validationmentioning

confidence: 82%

“…Therefore, it has been studied extensively (for instance; [23][24][25][26][27][28][29]). Heat transfer enhances in such a condition because of secondary flow that is generated by the buoyancy force.…”

Section: Introductionmentioning

confidence: 99%

“…Several different grid distributions have been tested to ensure that the calculated results are grid independent. The selected grid for the present Comparison of the axial evolution of Nu in a horizontal tube with the corresponding experimental results[26]. Comparison of dimensionless temperature with the numerical results of Choudhury and Patankar[32].…”

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confidence: 99%

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Numerical study of laminar mixed convection of a nanofluid in a horizontal tube using two-phase mixture model

Mirmasoumi

Behzadmehr

2008

Applied Thermal Engineering

229

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Section: Numerical Methods and Validationmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study of laminar mixed convection of a nanofluid in a horizontal tube using two-phase mixture model

Mirmasoumi

Behzadmehr

2008

Applied Thermal Engineering

229

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“…Axial evolution of the Nusselt number at different Fig. 4 Comparison between the calculated dimensionless temperature with the corresponding numerical results of Choudhury and Patankar [40] Rayleigh numbers is compared with the experimental results of Barozzi et al [36]. As shown in Fig.…”

Section: Numerical Methods and Validationmentioning

confidence: 96%

“…Therefore, it has been studied extensively for the conventional fluid (for instance, [34][35][36][37][38][39]). …”

Section: List Of Symbolsmentioning

confidence: 99%

Effects of nanoparticles mean diameter on the particle migration and thermo-hydraulic behavior of laminar mixed convection of a nanofluid in an inclined tube

Mirmasoumi

Behzadmehr

2012

Heat Mass Transfer

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Laminar mixed convection of a nanofluid consisting of Al 2 O 3 and water through an inclined tube has been investigated numerically. As mathematical model two-phase mixture model has been adopted, thus three dimensional elliptical governing equations have been solved to understand the flow behavior at different Re-Gr combinations. Control volume technique is used for discretization of the governing equations. For the convective and diffusive terms the second order upwind method was used while the SIMPLEC procedure was adopted for the velocity-pressure coupling. For different nanoparticle mean diameters and tube inclinations thermo-fluid parameters such as secondary flow, axial velocity profiles, nanoparticles distribution at the tube cross section, axial evolution of peripheral average convective heat transfer coefficient and pressure drop along the tube, have been presented and discussed. Maximum enhancement on the heat transfer coefficient is seen at tube inclination of 45°. List of symbolsC p Specific heat (J/kg K) D Tube diameter (m) DPD Dimensionless pressure drop along the tube [DP/(q nf V in 2 )] d p Nanoparticle diameter (nm) d f Molecular diameter of base fluid g Gravitational acceleration (m s -2 ) Gr Grashof number ¼ gb eff q 00 D 4 K eff t 2 eff h Convection heat transfer coefficient ¼ W m 2 K K Thermal conductivity (W/m K) Nu Peripheral average Nusselt number ¼ q w D k eff ðT w ÀT b Þ P Pressure (pa) Pr Prandtl number ¼ t eff a eff q w Uniform heat flux (W m -2 ) r Radial direction Re Reynolds number ¼ V m D m eff Ri Richardson number (= GrRe -2 ) T Temperature (K) V Velocity (m s -1 ) Z Axial directionGreek letters a Thermal diffusivity (m 2 /s) and tube inclination with respect to horizon (degree) b Volumetric expansion coefficient (K -1 ) h Angular coordinate / Volume fraction l Dynamic viscosity (N s m -2 ) m Kinematic viscosity (m 2 s -1 ) q Density (Kg m -3 )

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Combined convection and wall conduction effects in laminar pipe flow: numerical predictions and experimental validation under uniform wall heating

Piva

Barozzi

Collins

1995

Heat and Mass Transfer

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Experimental investigation of combined forced and free convection in horizontal and inclined tubes

Abstract: MECCANICA 20 (1985)

Cited by 62 publications

References 42 publications

Numerical study of laminar mixed convection of a nanofluid in a horizontal tube using two-phase mixture model

Numerical study of laminar mixed convection of a nanofluid in a horizontal tube using two-phase mixture model

Effects of nanoparticles mean diameter on the particle migration and thermo-hydraulic behavior of laminar mixed convection of a nanofluid in an inclined tube

Combined convection and wall conduction effects in laminar pipe flow: numerical predictions and experimental validation under uniform wall heating

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