Heat transfer during film condensation inside horizontal tubes in stratified phase flow

Sereda, Volodymyr; Rifert, V. G.; Горін, В. В.; Баранюк, Олександр Володимирович; Barabash, P. A.

doi:10.1007/s00231-020-02946-2

Cited by 11 publications

(8 citation statements)

References 32 publications

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“…The superficial velocity Jg and Martinelli Xtt values were 0.2598 (less than 1.5) and 0.000467 (less than 1), as in Table 1, respectively. The findings that have been obtained from [23] confirmed that as well. Fig.…”

Section: Validation Of the Mathematical Modelsupporting

confidence: 80%

“…3 presents the two-phase flow behavior in the developed region at mass flow rate of 2.1 ± 0.2 g/s. Indeed, Table 1 from [23] and the image of the experimental results from [24] confirmed the EES model for the current study to predict the two-phase flow pattern with good agreements.…”

Section: Validation Of the Mathematical Modelsupporting

confidence: 78%

“…The experimental data for model development were collected using circular tubes with inner diameters of 30-45 mm and inclination angles of 0-10 at pressures ranging from 1-67 bar and mass fluxes ranging from 10 to 329 kg/m 2 .s. Sereda et al [23] introduced an experimental study to assess the heat transfer during the condensation process of refrigerants R22 and R407C have a saturated condensing temperature of 40 C in a smooth horizontal tube has an internal diameter of 17 mm, while the range of mass velocity was from 6 to 57 kg/m 2 .s and the quality of vapor from 0.95 to 0.23. The particular devices were used to measure the heat flux at circumferential of the condensation tube and the features of the heat transfer during the streamlet flow of the phases.…”

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confidence: 99%

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Modeling of Heat Transfer and Steam Condensation Inside a Horizontal Flattened Tube

Kamil¹,

Kassim²,

Mahmood³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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This work investigates the steam condensation phenomena in an air-cooled condenser. The considered horizontal flattened tube has a 30 mm hydraulic diameter, and its length is a function of the steam quality with a limit value between 0.95 and 0.05. The mass flow rate ranges from 4 to 40 kg/m 2 .s with a saturated temperature spanning an interval from 40°C to 80°C. A special approach has been implemented using the Engineering Equation Solver (EES) to solve a series of equations for the two-phase flow pattern and the related heat transfer coefficients. A wavy-stratified structure of the two-phase flow has been found when the mass rate was between 4 and 24 kg/m 2 .s. In contrast, an initially annular flow is gradually converted into a wavy stratified flow (due to the condensation process taking place inside the flattened tube) when the considered range ranges from 32 to 40 kg/m 2 .s. KEYWORDSCondensation; flow pattern structure; heat transfer rate; flow in horizontal pipe; flow behaviour; EES modelling Nomenclature A Tube cross-section area, [m 2 ] A l Liquid cross-section area, A l = A (1-ε), [m 2 ] A ld Dimensionless cross-sectional area occupied by liquid, A ld = A l /d 2 A V Vapor cross-sectional area, Av = A ε, [m 2 ] A vd Dimensionless cross-sectional area occupied by vapor, A vd = A v /d 2 c p Specific heat, [J/(kg.K)] D h Hydraulic diameter, [m] Fr l Liquid Froude number, G 2 /(q 2 l gD h ) g Acceleration of gravity, [m/s 2 ] G Total mass flow rate (mass velocity) of liquid and vapor [kg/(m 2 .s)] G strat Transition mass velocity of stratified flow [kg/(m 2 .s)] G wavy Transition mass velocity of wavy flow [kg/(m 2 .s)] h Heat transfer coefficient [W/(m 2 .K)]

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Section: Validation Of the Mathematical Modelsupporting

confidence: 80%

Section: Validation Of the Mathematical Modelsupporting

confidence: 78%

mentioning

confidence: 99%

See 1 more Smart Citation

Modeling of Heat Transfer and Steam Condensation Inside a Horizontal Flattened Tube

Kamil¹,

Kassim²,

Mahmood³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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show abstract

“…Bae and Rohsenow [9] , Shah [10] , Camaraza-Medina et al. [11] and Rifert’s work [12] , [13] ) on the determination of the energy and mass transfer coefficient finds good values of

. The possible effects of the presented results on the performance of such applications should be discussed.…”

Section: Applications and Discussionmentioning

confidence: 99%

Analytical solution of a non-homogeneous boundary-value problem for the transport equation in an earth to air energy exchanger by initial base analysis method

Gomat

Ngoma

2022

MethodsX

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“…The outcomes illustrate that at a range of steam mass flow rates and constant ambient temperature, the steam condenser temperature and correspondence pressure decrease as the fan speed is increased. Sereda et al [30] introduced an experimental study to assess the heat transfer during the condensation process of freons R22 and R407C have a saturated condensing temperature of 40℃ in a smooth horizontal tube has an internal diameter of 17 mm, while the range of mass velocity was from 6 to 57kg/m 2 s and the quality of vapour from 0.95 to 0.23. The authors presented a CFD simulation through the heat transfer of condensing vapour of R22 freon to the system of cooling water by a cylinder that has a thick wall.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Coolant Side Characteristic on the Performance of Air-Cooled Condenser Structured by Horizontal Flattened Tube

Kamil¹,

Kassim²,

Mahmood³

2022

IJHT

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The steam condensation process has been experimentally investigated in an air-cooled condenser (ACC). The ACC has been designed and built using a flattened cross-section horizontal tube. The flattened tube has an internal dimension of 102 mm x 12 mm with 4030 mm length. A range of vacuum operating conditions are applied to operate the ACC. In the experiments, parameters such as vacuum pressure, saturated temperature, wall tube temperature, rate of heat transfer, and local average steam heat transfer coefficient have been considered along the flow direction with the variation of cooling water temperature. The experimental results revealed that the steam saturated temperature and the related pressure decrease with the reduction of the cooling water temperature, and the temperatures of the upper and lower parts of the horizontal flattened tube. The results also showed that the local steam condensation heat transfer coefficient decreases along with the direction of the flow, but it there is incrementing with the decreasing of saturated steam temperature at a certain range of cooling water temperature.

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Heat transfer during film condensation inside horizontal tubes in stratified phase flow

Cited by 11 publications

References 32 publications

Modeling of Heat Transfer and Steam Condensation Inside a Horizontal Flattened Tube

Modeling of Heat Transfer and Steam Condensation Inside a Horizontal Flattened Tube

Analytical solution of a non-homogeneous boundary-value problem for the transport equation in an earth to air energy exchanger by initial base analysis method

Experimental Investigation of Coolant Side Characteristic on the Performance of Air-Cooled Condenser Structured by Horizontal Flattened Tube

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