Condensation Heat Transfer on Geometrically Enhanced Horizontal Tube: A Review

Ali, Hafız Muhammad

doi:10.5772/65896

Cited by 8 publications

(5 citation statements)

References 42 publications

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“…Interesting results were obtained as condensing tubes were found unaffected by the variation of mass-flow rate. An extensive literature review on condensate retention on enhanced tubes has also been reported by Ali [22].…”

Section: Film-wise Condensationmentioning

confidence: 82%

Condensate retention of water-ethanol mixture on horizontal enhanced condensing tubes

et al. 2019

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Condensate retention has been found an important parameter for heat transfer on horizontal enhanced condensing tubes. In this research, five pin-fin (varying in circumferential pin spacing) and three integral-fin horizontal tubes are investigated for condensate retention angle (which is measured from the top of tooth to the fully flooded flank) using water-ethanol mixture. An attempt was made to find the optimum concentration of ethanol in water for maximum retention angle. Concentration of ethanol was varied in between 0.5% to 1.5% by weight. Data revealed the importance of integral-fin tube over pin-fin tube as significant increase in retention angle was observed for integral-fin tube ((having same longitudinal spacing, tooth thickness, tooth height, inner and outer diameter) while retention angle for pin-fin tubes remain unchanged. Optimum ethanol concentration was observed to be 0.75%.

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Section: Film-wise Condensationmentioning

confidence: 82%

Condensate retention of water-ethanol mixture on horizontal enhanced condensing tubes

et al. 2019

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“…In the recent years, different manufacturing techniques are used to enhance the heat transfer effects by maximizing the surface area resulting change in the fin profiles. A 3D rectangular cross section "pin -fin" geometry can be constructed since the criterion to judge the condensation heat transfer effects only an integral-fin tube is not enough [19,27,[100][101][102][103]. Tubes comprising such tubes are called "pin-fin tubes" and are clarified by six dimensions in particular such as: pin-root diameter, longitudinal pin spacing and thickness, circumferential pin spacing and thickness, and pin height [100].…”

Section: Pin-fin Tubesmentioning

confidence: 99%

An Overview of Recent Progress in Condensation Heat Transfer Enhancement Across Horizontal Tubes and the Tube Bundle

Bano

2021

Journal of Thermal Engineering

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The present paper presents a review of condensation heat transfer across smooth and enhanced horizontal surfaces due to its significance in refrigeration, air conditioning and heat pump applications. The emphasizes is on the recent understanding of experimental as well as the semi-empirical correlations to investigate the heat transfer phenomena during condensation associated with enhanced geometries. An effort has been made to submit freeconvection condensation effects outside of single tubes and the tube bundle with the influence of tube geometries, condensate retention and gravity on film condensation; however, comparison of forced convection is also presented. Alternative of conventional refrigerants in condensation process by low-global warming potential (GWP) refrigerants is addressed as well due to increase in atmospheric burden affected by hydro-fluoro-carbons (HFCs). Although many researchers have reviewed the condensation impact across enhanced surfaces, a few of them revised its behavior across pin-fin tubes. The effects of geometry, surface wettability, and operating conditions on the location, amount and form of condensate film are discussed. Various theoretical models prediction with the new experimental data across pin-fin tubes is also revealed. This review is distributed into two main sections: the first section focuses on condensation across enhanced tubes, sub dividing the study into integral-fin and pin-fin tubes based on theoretical and experimental investigations. It covers the geometrical effects concerning three dimensional (3D) surfaces, fin density, fin spacing and fin thickness. The later part of the paper concentrates on condensation behavior across the tube bundle incorporating the effects of fin density and refrigerant mixtures highlighting both theoretical and experimental knowledge. Recent research shows an agreement between theoretical and experimental models in the defined area; though, a considerable amount of work on semi-empirical correlation formulation is visible in the literature. The strength of this paper is the latest findings on condensation against different geometrical parameters of extended surfaces specifically across pin-fin tubes and the tube bundle. Finally, theoretical enhancement factors along with many heat transfer correlations are presented and recommendations are suggested for the future work.

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“…Recently Ali and Briggs [20] published an analytical model which predict most of the experimental data on pin-fin tubes to within ±15%. Ali also summarized the previous work on enhanced tubes successfully [22].…”

Section: Introductionmentioning

confidence: 97%

Condensate retention as a function of condensate flow rate on horizontal enhanced pin-fin tubes

Ali

Abubaker

et al. 2019

Therm sci

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The extent of condensate flooding as a function of condensate flow rate is measured on six horizontal pin-fin tubes (varying in circumferential pin-spacing) via simulated experimentation. Surface tension to density ratio is tested using three fluids namely water, ethylene glycol and R-141b. Results show that flooding was strongly effected by changing the condensate flow rate. An increase in flow rate caused a marginal decrease in flooding angle (an angle extracted from top of the test tube to the fully flooded flank). Similarly, circumferential pin-spacing also effected the retention angle and the effect goes on increasing by decreasing the surface tension to density ratio.

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Condensation Heat Transfer on Geometrically Enhanced Horizontal Tube: A Review

Cited by 8 publications

References 42 publications

Condensate retention of water-ethanol mixture on horizontal enhanced condensing tubes

Condensate retention of water-ethanol mixture on horizontal enhanced condensing tubes

An Overview of Recent Progress in Condensation Heat Transfer Enhancement Across Horizontal Tubes and the Tube Bundle

Condensate retention as a function of condensate flow rate on horizontal enhanced pin-fin tubes

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