Natural convection heat transfer on the outer surface of inclined cylinders

Heo, Jeong-Hwan; Chung, Bum-Jin

doi:10.1016/j.ces.2012.02.012

Cited by 45 publications

(18 citation statements)

References 19 publications

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“…When compared with temperature measurement, this technique is attractive as it provides a simple, cheap, and accurate measurement method through measurement of the electric current [11,12]. This technique was developed by several researchers [13][14][15][16] and the methodology has been tested to various flow conditions such as forced, natural, and mixed convection [17][18][19][20][21][22][23] and now is well-established. Nusselt number would depend on all three numbers: Pr, Re and Ra.…”

Section: Experiments Methodologymentioning

confidence: 99%

The influence of tip clearance and Prandtl number on turbulent forced convection heat transfer of rectangular fins

Park

Chung

2016

Heat Mass Transfer

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Mass transfer coefficient [m/s] H Fin height [m] I lim Limiting current density [A/m 2 ] K Thermal conductivity [W/m K] L Length of base plate [m] N Number of electrons in charge transfer reaction Nu Dh Nusselt number (h h D h /k) p Pressure [N/m 2 ] Pr Prandtl number (ν/α) Q Total heat transfer rate [W] Ra L Rayleigh number (Gr L Pr) Re Dh Reynolds number (VD h /ν) S Fin spacing [m] Sc Schmidt number (ν/D m ) t Fin thickness [m] t n Transference number T Temperature [K] U x Uncertainty of x V Mean velocity [m/s] W Width of the base plate [m] y Distance to nearest wall [m] y + Dimensionless wall distance (ρμ τ y/μ) Greek symbols α Thermal diffusivity [m 2 /s] β Volume expansion coefficient [1/K] μ Viscosity [kg/m s] ν Kinematic viscosity [m 2 /s] ρ Density [kg/m 3 ]

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Section: Experiments Methodologymentioning

confidence: 99%

The influence of tip clearance and Prandtl number on turbulent forced convection heat transfer of rectangular fins

Park

Chung

2016

Heat Mass Transfer

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“…Heo [13] investigated experimentally natural heat transfer on inclined cylinders, based on the analogy between mass and heat transfer. In this study, the authors found a dispersion between results in the literature [5,15,16,17] and others.…”

Section: Previous Researchmentioning

confidence: 99%

“…For inclined position, we chose to refer to studies dealing with bare cylinders and flate plates facing downwards and upwards [1,2,6,13,14]. Heo [13] investigated experimentally natural heat transfer on inclined cylinders, based on the analogy between mass and heat transfer.…”

Section: Previous Researchmentioning

confidence: 99%

Numerical and experimental determination of external heat transfer coefficient in small TENV electric machines

Meksi

Vargas

2015

2015 IEEE Energy Conversion Congress and Exposition (ECCE)

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This paper presents a thermal analysis to determine the average natural convection and radiation heat transfer coefficients for a small totally enclosed not ventilated (TENV) synchroreluctant motor. A numerical solution based on Computational Fluid Dynamics (CFD) is compared with empirical correlations and experimental measurements for validation. For CFD calculation, a 3D housing shape is modelled in the steady state. Experimental measurements are made using K thermocouples and an infrared camera. The thermal analysis is done for the horizontal position. This study shown the possibilities of fitting numerical results in order to reduce the CPU time and compare this method with classical empirical correlations.

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“…External free convection is modelled using a set of recently published correlations (equation (4)) by Heo and Chung [33]. These correlations allow for obtaining the Nusselt number at the pipelineeexternal flow interface for different values of the pipeline inclination angle.…”

Section: Transmission Pipeline: Friction Modelmentioning

confidence: 99%

Steady-state analysis of a conceptual offshore wind turbine driven electricity and thermocline energy extraction plant

Buhagiar

Sant

2014

Renewable Energy

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a b s t r a c tA system for using offshore wind energy to generate electricity and simultaneously extract thermal energy is proposed. This concept is based on an offshore wind turbine driven hydraulic pump supplying deep seawater under high pressure to a land based plant consisting of a hydroelectric power generation unit and heat exchanger. A steady-state system model is developed using empirical formulae. The mathematical model comprises the fundamental system sub-models that are categorised as the rotor, hydraulic pump, pipeline, hydroelectric turbine and heat exchanger. A means for modelling the seawater temperature field across a two-dimensional bathymetry is also discussed. These mathematical models are integrated into a computational tool and a brief parametric static analysis is undertaken. The results illustrate the effect of pipeline diameter, rotational speed of the grid connected hydroelectric turbine, and the turbine distance from shore on the overall performance of the system. Through adequate parameter selection, the total rate of energy output for such a system, consisting of both electricity and thermal energy, is shown to increase by as much as 84%, when compared to a conventional wind turbine having an identical rotor diameter but which supplies only electrical energy.

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Natural convection heat transfer on the outer surface of inclined cylinders

Cited by 45 publications

References 19 publications

The influence of tip clearance and Prandtl number on turbulent forced convection heat transfer of rectangular fins

The influence of tip clearance and Prandtl number on turbulent forced convection heat transfer of rectangular fins

Numerical and experimental determination of external heat transfer coefficient in small TENV electric machines

Steady-state analysis of a conceptual offshore wind turbine driven electricity and thermocline energy extraction plant

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