Free convection condensation of steam on horizontal wire wrapped tubes: Effect of wire thermal conductivity, pitch and diameter

Ali, Hafız Muhammad; Qasim, Muhammad

doi:10.1016/j.applthermaleng.2015.07.006

Cited by 25 publications

(6 citation statements)

References 24 publications

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“…The wrapping wire can enlarge the contact area between fluid and tube, and can also enhance bubble nucleation. The helical angle, pitch, diameter, and cross-section geometry of the wrapping wire play key roles in the heat transfer performance of wired-wrapped tubes [60,61].…”

Section: Enhanced Surfacesmentioning

confidence: 99%

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Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Lin

Kedzierski

2019

International Journal of Heat and Mass Transfer

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Global warming mitigation efforts have stimulated investigations of a new generation of low-GWP refrigerants. Because some of the proposed low-GWP refrigerants have unfavorable characteristics (e.g., flammability and toxicity), a small refrigerant charge is desirable. Compact heat exchangers with enhanced surfaces facilitate small refrigerant charge by having a large heat exchanger surface area to heat exchanger volume ratio. This paper reviews the current state-of-the-art for pool boiling heat transfer of low-GWP refrigerants on enhanced surfaces. An overview for the enhanced surface manufacturing technique is given along with detailed reviews of the heat transfer measurements and predictions for many of the low-GWP refrigerants, including the hydrofluoroolefin (HFO) class, the hydrocarbon (HC) class, carbon dioxide (CO2), and ammonia (NH3). The overview of the predictive methods includes mechanistic models and correlations for pool boiling on enhanced surfaces. Based on the surveyed literature, existing shortfalls are identified and suggestions for future studies are proposed.

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Section: Enhanced Surfacesmentioning

confidence: 99%

“…Other surfaces. (a) Wire-wrapped tube, from Ali and Qasim [60]; (b) dimpled tube, from Shafaee et al [62]. …”

Section: Figmentioning

confidence: 99%

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Lin

Kedzierski

2019

International Journal of Heat and Mass Transfer

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“…By reviewing the available literature, it was found that implementing structures on the surface can affect the condensation heat transfer characteristics. Hafiz et al 29 investigated the steam condensation on wire-wrapped tubes compared to the plain tube. The results indicated that the wire thermal conductivity effect was evident, and for all wire-wrapped tube combinations tested, heat transfer enhancement ratios were found.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of dropwise condensation heat transfer on a finned tube: Impact of pitch size

Aminian

Saffari

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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Condensation is one of the essential processes in diverse industries due to its widespread use in various industrial applications such as power generation, water desalination, and air conditioning. Much research has been conducted to achieve better efficiencies and better heat transfer performances in condensers in the past decades. Condensation is divided into dropwise and filmwise based on the surface free energy, surface roughnesses, and condensate characteristics. This study investigated the influence of the 1-Octadecanethiol coating on vertically grooved copper tube’s condensation heat transfer characteristics. The hydrophobic surfaces have been created using self-assembled monolayers (SAMs) on the pure copper tubes (99.9% Cu). Moreover, four different pitch sizes of 1.5, 2, 2.5, and 3.5 mm have been implemented on the surface. Finally, the heat flux and the heat transfer coefficient as functions of logarithmic mean temperature difference are reported in the result section. For validation, the results obtained from the experiment were compared with available data in the literature, and an acceptable agreement was achieved. According to the results, it was found that the 1.5-mm pitch size has the highest heat flux, and the 3.5-mm pitch size has the lowest heat flux. Additionally, it can be inferred that the maximum heat flux of 696.71 kW/m2 was attributed to the 1.5-mm pitch size for logarithmic mean temperature differences of 64.3 K, which is approximately 1.24 times higher compared to the plain tube.

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“…Another useful method to enhance heat transfer on horizontal tubes is by wrapping the wire on the smooth tube; recently, studies are reported by Ali and Qasim [47,48].…”

Section: Tubes With Three-dimensional Finsmentioning

confidence: 99%

Condensation Heat Transfer on Geometrically Enhanced Horizontal Tube: A Review

Ali¹

2017

Heat Exchangers - Advanced Features and Applications

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In this chapter, an attempt has been made to present the recent state of knowledge of free-convection condensation heat transfer on geometrically enhanced tubes. This survey is divided into three sections. The first section concentrates on research on condensate flooding or retention. The second and the third sections cover the experimental and the theoretical work on geometrically enhanced tubes, respectively.

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Free convection condensation of steam on horizontal wire wrapped tubes: Effect of wire thermal conductivity, pitch and diameter

Cited by 25 publications

References 24 publications

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces

Experimental analysis of dropwise condensation heat transfer on a finned tube: Impact of pitch size

Condensation Heat Transfer on Geometrically Enhanced Horizontal Tube: A Review

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