Steam condensation in horizontal and inclined tubes under stratified flow conditions

Ahn, Taehwan; Kang, Jinhoon; Bae, Byeonggeon; Jeong, Jae Jun; Yun, Byong-Jo

doi:10.1016/j.ijheatmasstransfer.2019.06.056

Cited by 20 publications

(7 citation statements)

References 23 publications

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“…The effect of gravity was considered, and the proposed model predicted the void fraction within 5% of the mean deviation. Ahn et al [40] investigated condensation characteristics in an inclinable circular pipe and proposed a condensation model. The researchers conducted 21 tests by changing the inclination angle, steam flow rate and inlet pressure.…”

Section: Smooth Tubes With Inclined Orientationmentioning

confidence: 99%

“…The proposed method properly predicted the characteristics of flow considering the experimental observations. Ahn et al [40] also studied separated flow regimes in the case of pure saturated steam flow in a 40 mm inner diameter pipe at inclination angles of -10° to 0°. Multidimensional parameters for local condensation heat transfer were selected as saturated steam at 1 to 5 bar of pressures and 10 to 50 kg/m 2 s of mass fluxes in an inclinable pipe with a length of 3 m. The proposed model predicted the heat transfer coefficient according to the experimental data with an average deviation of 6.2%.…”

Section: Smooth Tubes With Inclined Orientationmentioning

confidence: 99%

“…Steam condensation study [40] in horizontal and inclined tubes demonstrated that measured heat transfer coefficient increases with increasing steam quality or increasing mass flux and decreasing pressure.…”

Section: Vapor Qualitymentioning

confidence: 99%

See 2 more Smart Citations

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Karademir¹,

Ozcelik²,

Açıkgöz³

et al. 2021

Journal of Thermal Engineering

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This paper presents a comprehensive review of research works on condensation and boiling heat transfer characteristics in horizontal, vertical and inclined tubes both smooth and enhanced. Although there are many studies examining two-phase flows inside tubes, it is almost impossible to find such a comprehensive study for two-phase flow in tubes. Moreover, while number of the studies concerning condensation or boiling inside tubes are limited, the present study covers almost all studies of condensation and boiling inside inclined tubes. Previous studies are classified into many subtitles according to configuration (horizontal, vertical or inclined) and roughness (smooth or enhanced) as well as aim of the study (researching the effect of parameters on the heat transfer coefficient, pressure drop or evaluation of prediction correlation). Such a wide range of classification and scope have no done before. Condensation and boiling phenomena are of great importance in heat exchangers, cooling systems, etc. due to their wide utilization in those devices. Additionally, two-phase flow and the associated heat transfer are becoming increasingly important in industrial applications because the heat transfer coefficient in twophase flows is much higher than in single-phase flows. In this research, major topics such as heat transfer, pressure drop, friction factor and void fraction were studied using active and passive techniques in the literature. The fluids used in the reviewed studies diverse in a very wide range. For pure refrigerants (single component-fluorocarbon refrigerant),

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Section: Smooth Tubes With Inclined Orientationmentioning

confidence: 99%

Section: Smooth Tubes With Inclined Orientationmentioning

confidence: 99%

See 1 more Smart Citation

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Karademir¹,

Ozcelik²,

Açıkgöz³

et al. 2021

Journal of Thermal Engineering

View full text Add to dashboard Cite

show abstract

“…Wu et al [12] performed numerical simulation and performance comparison to establish the Spiral Wound Heat Exchanger (SWHE) partial geometric models with various tube diameters, pitches and spacing bar thickness. Ahn et al [13] conducted an experiment on condensation heat transfer to develop a condensation model considering the structure of separated flow patterns. Also, Rajkumar et al [14] presented experimental data on the condensation of steam on vertical bare copper tubes and lead coated copper tubes.…”

Section: Introductionmentioning

confidence: 99%

“…Figure13. Dependence of condensate thickness and mass flow rate on wall height X for laminar ammonia condensate outflow with ϑs = 98.5 °C and ϑ ' = 100 °C…”

mentioning

confidence: 99%

Entropy Analysis of Complete Condensation of Saturated Steam on a Vertical Wall Using Nusselt Velocity and Temperature Profile in a Condensate Layer

Rauch¹,

Mudrinić²,

Galović³

2021

J. sustain. dev. energy water environ. syst.

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In this paper an analytical model for calculation of entropy production for Nusselt model of condensation of pure substance vapour is given. Model development starts from basic two-dimensional integral equation for entropy production and describes film condensation on a vertical wall. Model covers entropy production, which is a result of two-dimensional heat transfer in a condensate layer, existence of velocity gradient and condensate layer viscosity. Entropy contribution of each of the members is explicitly derived in a closed form and the results of calculation are shown in the appropriate diagrams. Diagrams present film condensation of dry saturated water steam and dry saturated ammonia steam, both with saturation temperature of 100 °C with surface wall temperature of 98.5 °C. Obtained equations and presentation of the related results have shown that dominant entropy production is directly connected only with heat conduction in y-axis direction, where y-axis corresponds with thickness of condensate layer.

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Approximate Turbulence Energy Dissipation Time-Scaling for Subsonic Steam–Water Two-Phase Flows

Khan

Sanaullah

Zwawi

et al. 2022

Iran J Sci Technol Trans Mech Eng

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Steam condensation in horizontal and inclined tubes under stratified flow conditions

Cited by 20 publications

References 23 publications

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Comprehensive Review on the Flow Characteristics of Two-Phase Flows in Inclined Tubes

Entropy Analysis of Complete Condensation of Saturated Steam on a Vertical Wall Using Nusselt Velocity and Temperature Profile in a Condensate Layer

Approximate Turbulence Energy Dissipation Time-Scaling for Subsonic Steam–Water Two-Phase Flows

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