The influence of fin structure and fin density on the condensation heat transfer of R134a on single finned tubes and in tube bundles

Al-Badri, Alaa R.; Bär, Andreas; Gotterbarm, Achim; Rausch, Michael H.; Fröba, Andreas P.

doi:10.1016/j.ijheatmasstransfer.2016.04.087

Cited by 35 publications

(27 citation statements)

References 12 publications

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“…1-36, January, 2021 5 are also reported on the effect of circumferential fin spacing, longitudinal fin thickness and fin height where it is concluded that the circumferential fin spacing is a governing factor affecting the condensation for three different types of working fluids like water, ethylene glycol and R-113 [45,46]. To explore the influence of fin density and fin structure, experimental data is conducted by Badri [47] for standard-fin tubes (SFTs) and enhanced-fin tubes (EFTs).EFTs are categorized for non-uniform fin structure with fin densities (fin per inch, fpi) of 39,48 and 56 fpi, and show higher HTCs as compared to the SFTs. Among all the tubes tested the 39 fpi tube provided the highest HTCs likewise the prediction of experimental data with the theoretical models is presented.…”

Section: Experimental Heat Transfer Measurementsmentioning

confidence: 99%

“…Fin density is one of the parameters, which also influence the condensation effect on tube bundle. In this context, a part from single tube measurements presented by Badri [47], HTCs is measured for every single row of the tube bundle out of four rows in total. It is observed that the SFTs show a decrease in HTCs with increase in row number when comparing EFTs.…”

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confidence: 99%

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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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Section: Experimental Heat Transfer Measurementsmentioning

confidence: 99%

mentioning

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 effects of fin pitch and height on the condensate retention [11,12] of these fin structures are well-established and several heat transfer models [13,14] which account for the surface tension and gravitational forces on integral-fin tubes have been developed. In comparison, relatively fewer investigations on three-dimensional fin structures such as pin fins [15] and enhanced fin tubes (EFTs) [16] have been reported. The use of pin fins, as shown in Fig.…”

Section: Natural Convection Condensation Heat Transfer On Extended Surfacesmentioning

confidence: 99%

“…On the other hand, in the surface tension-dominated region, a linear pressure gradient across the condensate film was assumed and the liquid film equation between points i and k was reduced to that of Eq. (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17), where lik is the length between the two points, and ri and rk are the curvatures at points i and k, respectively. Their model was found to predict the condensation rate of various integral-fin tubes with an accuracy of ±15%.…”

Section: Objectives and Scopementioning

confidence: 99%

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Enhancement of natural and forced convection condensation using three-dimensional extended structures

Ho¹

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Modeling the Condensation Heat Transfer on Horizontal Low‐Finned Tubes

Losher,

Klein,

Rehfeldt

2024

Chemie Ingenieur Technik

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Most studies regarding heat transfer on low‐finned tubes address the condensation of refrigerants and water on copper tubes. Existing models are mainly validated for this use case since studies regarding different substances or tube materials are scarce in the literature. This paper presents measurement data on the condensation of n‐propanol, isopropanol, isobutanol, and acetone on low‐finned stainless‐steel tubes. Together with experimental data from the literature, the measurements are used to test the performance of models from the literature. As the investigated models fail to describe all measurement data, a new model based on a set of dimensionless numbers is derived and fitted to the experimental data.

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The influence of fin structure and fin density on the condensation heat transfer of R134a on single finned tubes and in tube bundles

Cited by 35 publications

References 12 publications

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

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

Enhancement of natural and forced convection condensation using three-dimensional extended structures

Modeling the Condensation Heat Transfer on Horizontal Low‐Finned Tubes

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