Experimental analysis of mixed convection in inclined tubes

Maré, Thierry; Galanis, Nicolas; Voicu, Ionuț; Miriel, Jacques

doi:10.1016/j.applthermaleng.2005.11.011

Cited by 21 publications

(13 citation statements)

References 9 publications

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“…This would then give rise to the higher friction factors. Many numerical and experimental studies have been performed showing this distortion (Faris and Viskanta 1969;Ou and Cheng 1977;Hwang and Tsai 1997;Maré et al 2006). Mikesell (1963) suggested and observed that in certain extreme cases backflow might even occur.…”

Section: Heat Transfermentioning

confidence: 99%

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

Olivier¹,

Meyer

2010

HVAC&R Research

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Section: Heat Transfermentioning

confidence: 99%

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

Olivier¹,

Meyer

2010

HVAC&R Research

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“…Also, pressure drop in the fin tubes is more than the flat tubes. Maré, et al [24] also analyzed experimentally mixed convective heat transfer of laminar flow in a circular inclined tube.…”

Section: Numerical Study Of the Effect Of The Reynolds Numbers On Thementioning

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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“…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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Experimental analysis of mixed convection in inclined tubes

Cited by 21 publications

References 9 publications

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

Single-Phase Heat Transfer and Pressure Drop of the Cooling of Water inside Smooth Tubes for Transitional Flow with Different Inlet Geometries (RP-1280)

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

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

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