Theoretical investigation into condensation heat transfer on horizontal elliptical tube in stationary saturated vapor with wall suction

Chang, Tong‐Bou; Yeh, Wen-Yu

doi:10.1016/j.applthermaleng.2010.11.018

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…powerplants, heat exchangers and refrigeration, many effects on the film condensation have been addressed, including surface temperature [7][8][9], turbulent flow [10,11], wall suction [12][13][14] and others [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Investigation of vapor condensation on a flat plate and horizontal cryogenic tube using lattice Boltzmann method

Hatani

Farhadzadeh

Rahimian

2015

International Communications in Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Investigation of vapor condensation on a flat plate and horizontal cryogenic tube using lattice Boltzmann method

Hatani

Farhadzadeh

Rahimian

2015

International Communications in Heat and Mass Transfer

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“…As shown in (17), the dimensionless entropy generation in the condensate layer on the horizontal tube is induced by both heat transfer and liquid film flow friction. In (19), 0 , Br, and Ψ are defined as 0 = (( − V ) / ) 2 , Br = 2 0 / Δ , and Ψ = Δ / , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The problem of laminar film condensation with wall suction effects has been widely discussed in the literature [16][17][18]. In general, the results have shown that wall suction significantly enhances the condensation heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube

Chang

2014

Mathematical Problems in Engineering

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The effects of wall suction on the entropy generation rate in a two-dimensional steady film condensation flow on a horizontal tube are investigated theoretically. In analyzing the liquid flow, the effects of both the gravitational force and the viscous force are taken into account. In addition, a film thickness reduction ratio,Sf, is introduced to evaluate the effect of wall suction on the thickness of the condensate layer. The analytical results show that, the entropy generation rate depends on the Jakob number Ja, the Rayleigh number Ra, the Brinkman number Br, the dimensionless temperature differenceψ, and the wall suction parameterSw. In addition, it is shown that in the absence of wall suction, a closed-form correlation for the Nusselt number can be derived. Finally, it is shown that the dimensionless entropy generation due to heat transfer,NT, increases with an increasing suction parameterSw, whereas the dimensionless entropy generation due to liquid film flow friction,NF, decreases.

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“…Chang and Yeh [29] performed an analytical investigation for the problem of film condensation flow over the outer surface of a horizontal elliptical tube with wall suction effects. The liquid film flow is affected by gravitational and surface tension forces.…”

Section: Introductionmentioning

confidence: 99%

Analysis of laminar film condensation over vertical permeable hollow short fins

Khaled

Felemban

2015

J Mech Sci Technol

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Laminar falling film condensation over vertical short fin is analyzed. The fin is considered to be hollow and permeable in order to account for condensate suction towards its inner core. The present work accounts for the shear stress at the interface caused by the large velocity of the saturated vapor. The continuity, momentum, and energy equations for the film condensate are solved using an iterative and implicit finite-difference method. The condensate flow rate inside the fin is obtained using the conservation of mass principle and the Poiseuille flow equations. The one-dimensional fin equation model is used to relate the fin temperature to the condensate flow convection heat transfer coefficient. Various computational and numerical methods techniques such as advanced linearization and generations of best-fit correlations are implemented. This is to reduce significantly the number of iterations required for solution convergence as all of the aforementioned equations are coupled. It is found that the dimensionless total mass transfer rate increases slightly as vapor Reynolds number increases. It increases apparently as both suction Reynolds number and dimensionless suction length increase. For both large suction Reynolds number and large dimensionless suction length, the flow rate of the condensate in the falling film can be neglected compared to the total suction condensate flow rate. The fin thermal length increases as Reynolds number, dimensionless suction length, and Grashof number increase. This study shows that significant condensation mass flow rate enhancement ratios are obtainable (can be 18 folds) due to suction through a hollow super conductive fin.

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Theoretical investigation into condensation heat transfer on horizontal elliptical tube in stationary saturated vapor with wall suction

Cited by 15 publications

References 23 publications

Investigation of vapor condensation on a flat plate and horizontal cryogenic tube using lattice Boltzmann method

Investigation of vapor condensation on a flat plate and horizontal cryogenic tube using lattice Boltzmann method

Theoretical Analysis of Effects of Wall Suction on Entropy Generation Rate in Laminar Condensate Layer on Horizontal Tube

Analysis of laminar film condensation over vertical permeable hollow short fins

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