Heat transfer, void fraction and pressure drop during condensation inside inclined smooth and microfin tubes

Adelaja, Adekunle O.; Ewim, Daniel Raphael Ejike; Dirker, Jaco; Meyer, Josua P.

doi:10.1016/j.expthermflusci.2019.109905

Cited by 16 publications

(6 citation statements)

References 75 publications

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“…Adelaja et al [80] measured heat transfer coefficients (HTC) and pressure drop during condensation inside inclined smooth and micro-fin tubes. For the micro-fin tube, they obtained maximum heat transfer coefficient at tube inclinations of between −15 and −5° (downward flows), while for the smooth tube, the maximum HTC was found at inclinations of between −30 and −15° (downward flows).…”

Section: Enhanced 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

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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: Enhanced Tubes With Inclined Orientationmentioning

confidence: 99%

“…The schematic diagram of the experimental apparatus [From Adelaja et al[80], with permission from Elsevier.] The section of the enhanced tube [From Adelaja et al[80], with permission from Elsevier. ]…”

mentioning

confidence: 99%

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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“…The study of the thermal-hydraulic characteristics of two-phase flow in inclined smooth and enhanced tubes has increased considerably in the past two decades due to their applications in industrial V-and A-frame heat exchangers; automobiles moving downhill and uphill; during take-offs, landing, and banking of air transport vessels [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Shaahid et al [8] experimentally investigated the frictional pressure drop of oil-water flow at different inclination angles. Furthermore, Adelaja et al [2,9] experimentally studied the frictional pressure drop of HFC134a in inclined smooth and enhanced tubes but did not develop predictive models. Soft computing techniques such as machine learning have been proposed as predictive and optimization tools for the future.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, this paper aims to apply and evaluate RF and ET when predicting the pressure gradient during convective condensation in inclined flows for all ranges of inclination angles. A detailed description of the test facility can be found in earlier publications of the authors [1][2][3]9,16]. In this section, a brief explanation of the test rig is done-the test facility comprised a vapour compression cycle with the compressor's high-pressure line separated into two.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of Pressure Gradient during Condensation in Inclined Heat Exchanger Using Machine Learning Techniques

Adekunle¹,

Adelaja²,

George³

et al. 2022

Preprint

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This study employs machine learning techniquesrandom forest and extra trees -to predict the frictional pressure gradient during convective condensation in an inclined in-tube heat exchanger. The experimental data matrix (663) includes conditions for saturation temperatures of 30, 40, and 50 o C, mass velocity 100-400 kgm -2 s, quality 10-90%, and thirteen inclination angles between -90 o and +90 o for a smooth tube of an internal diameter of 8.38 mm. Based on statistical analysis, the extra trees outperforms the random forest. The average deviation (AD) and mean average deviation (MAD) are 2.88% and 6.72%, respectively, for random forest (RF) and 0.25% and 2.97%, respectively, for extra trees (ET).

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Modelling of heat transfer coefficients during condensation inside an enhanced inclined tube

Ewim

Adelaja

Onyiriuka

et al. 2020

J Therm Anal Calorim

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Heat transfer, void fraction and pressure drop during condensation inside inclined smooth and microfin tubes

Cited by 16 publications

References 75 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

Prediction of Pressure Gradient during Condensation in Inclined Heat Exchanger Using Machine Learning Techniques

Modelling of heat transfer coefficients during condensation inside an enhanced inclined tube

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