Effect of natural convection instabilities on rates of heat transfer at low reynolds numbers

Scheele, George F.; Hanratty, Thomas J.

doi:10.1002/aic.690090209

Cited by 27 publications

(5 citation statements)

References 4 publications

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“…The theoretical analysis of Pigford [18] and Test [19] predict a higher value of Nusselt number in heating of liquids flowing through ducts due to reduction in viscosity of the liquid at the heat walls. The experimental results of Scheele and Hanratty [11] also confirm the present trend. The scatter in Fig.…”

Section: Discussionsupporting

confidence: 78%

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Experimental study of combined free and forced laminar convection in an asymmetrically heated two-dimensional aiding flow

Rao

Barrow

1972

Wärme- und Stoffübertragung

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Section: Discussionsupporting

confidence: 78%

“…Stoffiibertragung and Hanratty [11] and Kemery and Somers [12], while more recently, Sherwin and Wallis [13] have presented some heat transfer data and flow pattern in an internally heated concentric vertical annulus.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of combined free and forced laminar convection in an asymmetrically heated two-dimensional aiding flow

Rao

Barrow

1972

Wärme- und Stoffübertragung

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“…Several of these investigators (e.g., [1,3,4]) noted that transition from laminar to turbulent flow was influenced very strongly by the heat flux, but none of them considered this effect from the viewpoint of the developing velocity profiles. Scheele and Hanratty [13,14] gave experimental data on the transition process.…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this work was to investigate the entrance effects on an upward flow of fluid in a vertical, heated tube in order to obtain a method of predicting the developing velocity and tem--Nomenclature-A = wall area C = const defined by equation (5) C' = C/GrC2 C" Ci, C3 = const defined by equation (4) Coi, Cm, Cos = const defined by equations (13), (14), (15) Cp = specific heat D = tube inside dia / = friction factor Gr = R 3 g/v 2 , dimensionless g = gravitational acceleration h = vertical distance between temperature measuring points on pressure line k = thermal conductivity L = length M = number of divisions of radius for finite difference approximation m = radial position for finite difference approximation n = axial position in finite difference approximation R*g(g/A)p Nat = , , Grashoff numv 2 k ber p = pressure P = p/pUa 1 …”

Section: Introductionmentioning

confidence: 99%

Heat-Transfer Effects on the Developing Laminar Flow Inside Vertical Tubes

Lawrence

Chato

1966

Journal of Heat Transfer

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A numerical method was developed for the calculation of entrance flows in vertical tubes for the cases of upflow or downflow and constant wall heat flux or constant wall temperature.The solutions were in excellent agreement with experimental data obtained with water flowing upward in a vertical heated tube. The results show that both the density and the viscosity have to be treated as nonlinear functions of temperature. Consequently, for the constant heat flux condition, the velocity and temperature profiles constantly change and never reach "fully developed" states.The transition to turbulent flow was also studied. The experimental measurements demonstrated that the transition process depends on the developing velocity profiles. For the constant heat flux case, transition will always occur at some axial position.For a given entrance condition, the distance to transition is fixed by the fluid-flow rate and the wall heat fl-ux. For the experimental results, a tentative transition criterion was obtained, which depends only on the velocity profile shape, fluid viscosity, and the entrance Reynolds number.

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“…Heat transfer in steady mixed convection in a vertical tube was numerically and experimentally investigated by Scheele et al (1960), Scheele and Hanratty (1963), and Lawrence and Chato (1966) for buoyancy aiding and opposing flows. Flow reversal was noted at high Gr/Re.…”

Section: Introductionmentioning

confidence: 99%

Transient Laminar Mixed Convective Heat Transfer in a Vertical Flat Duct

Lin

Yin

Yan

1991

Journal of Heat Transfer

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Transient Laminar Mixed Convective Heat Transfer in a Vertical Flat DuctUnsteady laminar aiding and opposing mixed convection heat transfer in a vertical flat duct is numerically investigated for an initially fully developed flow. Results indicate that unsteady heat transfer characteristics in the flow are principally determined by wall-to-fluid heat capacity ratios. Effects of the buoyancy and degree of asymmetric heating or cooling are rather insignificant. Correlation equations for the time variations of local Nusselt numbers with wall-to-fluid heat capacity ratios are proposed.Transactions of the ASME Downloaded From: http://heattransfer.asmedigitalcollection.asme.org/ on 05/16/2015 Terms of Use: http://asme.org/terms

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Effect of natural convection instabilities on rates of heat transfer at low reynolds numbers

Cited by 27 publications

References 4 publications

Experimental study of combined free and forced laminar convection in an asymmetrically heated two-dimensional aiding flow

Experimental study of combined free and forced laminar convection in an asymmetrically heated two-dimensional aiding flow

Heat-Transfer Effects on the Developing Laminar Flow Inside Vertical Tubes

Transient Laminar Mixed Convective Heat Transfer in a Vertical Flat Duct

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