An experimental and theoretical analysis of vapor-to-liquid phase change on microstructured surfaces

Budaklı, Mete; Salem, Thamer Khalif; Arık, Mehmet

doi:10.1016/j.applthermaleng.2020.115382

Cited by 2 publications

(2 citation statements)

References 40 publications

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“…During dropwise condensation for vertically aligned grooves, the cleaning effects of falling droplets were enhanced and the associated heat transfer was increased by up to 50%, whereas horizontally aligned grooved surfaces produced results similar to that of a smooth surface. Conversely, Budalki et al [2] found little, if any, improvement in heat transfer performance during dropwise condensation on their copper surfaces modified with square and V-shaped grooves of height 500µm and pitch 500µm to 1000µm, when compared with an unmodified surface. Budalki et al [3] later found that although square grooves provided a 50% increase in condensation surface area, the thermal performance reduced by almost 30% compared to the unmodified surface.…”

Section: Introductionmentioning

confidence: 98%

Experimental investigation of condensation heat transfer on vertically inclined grooved aluminium surfaces

Shatskiy,

Kumavat,

O’Shaughnessy

2024

J. Phys.: Conf. Ser.

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This study details the experimental investigation of surface condensation heat transfer on vertically inclined aluminium surfaces with simple modifications. A bespoke experimental apparatus was constructed to control the saturation conditions inside the condensation chamber where the test surface is located. The degree of subcooling of the test surface was precisely controlled by an external heat exchanger. The meter bar technique was used to evaluate the condensation heat flux. Using distilled water as the working fluid and a plane aluminium test surface as the baseline case, the experimental apparatus was validated by comparison of the determined heat transfer coefficient with Nusselt’s model of filmwise condensation on a vertical plane surface, where an excellent agreement was obtained. 7 different aluminium test surfaces were subsequently investigated, each one modified with grooves measuring 0.5mm by 0.5mm (height and width), with a consistent spacing of 0.5mm between them. Groove angles relative to the vertical axis of 0° (180°), 30°, 45°, 60°, 90°, 120°, and 150° were investigated, where grooves were symmetrically mirrored at the centre of each test surface. Results highlighted a significant influence of groove angle on the heat transfer coefficient, with the best-performing sample (150˚) producing a maximum enhancement of 45% and an average enhancement of 34% compared to the baseline test surface over the respective range of subcooling.

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Section: Introductionmentioning

confidence: 98%

Experimental investigation of condensation heat transfer on vertically inclined grooved aluminium surfaces

Shatskiy,

Kumavat,

O’Shaughnessy

2024

J. Phys.: Conf. Ser.

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“…Surface modification can promote dropwise condensation by coating the surface, changing the material, or changing the structural properties of the surface [9,10]. Methods to increase the condensation surface area by altering structural properties, such as micro V-grooves, square grooves, and 3D hybrid surfaces, have been investigated [11][12][13]. Various methods have been proposed using micro/nanostructured surfaces that can lower the surface energy such that the droplets can be easily detached from the surface [14,15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Condensation Heat Transfer and Droplet Dynamics on Multiple Horizontal Copper Tubes with Superhydrophobic Characteristics

Sun,

Shin,

Park

et al. 2024

International Journal of Energy Research

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We conducted an experimental study on the condensation heat transfer and droplet dynamics on multiple horizontal copper tubes with superhydrophobic characteristics. Condensation heat transfer has various industrial applications such as power plants and air-conditioning systems. Because condensers are typically designed in multiple-tube configurations, studying the phenomenon of multiple tubes is important. We investigated the effect of a superhydrophobic surface modification, which induces dropwise condensation, on the heat transfer performance of multiple-tube condensers. The purpose of this research is to evaluate the extent to which heat transfer performance is improved by comparing superhydrophobic tubes with bare tubes and to analyze the impact of droplet dynamics on heat transfer performance. The results show that the heat transfer coefficient of the superhydrophobic tubes is improved by approximately 9.5%–44.9% compared to that of bare tubes. Droplet dynamic analysis revealed differences in droplet behavior between the superhydrophobic tubes and bare tubes, including the formation of droplets by condensation, the process of droplets falling on the tube surface, and the impact of droplets falling on other tubes in a multiple-tube configuration. Based on these results and observations, it can be concluded that the heat transfer performance of the superhydrophobic tube is superior to that of the bare tube. The droplet dynamic analysis demonstrated that the droplets formed on the superhydrophobic surface could be easily removed by the flow, leading to more efficient heat transfer. These findings highlight the potential for more efficient heat transfer in multiple tubes through superhydrophobic modifications.

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An experimental and theoretical analysis of vapor-to-liquid phase change on microstructured surfaces

Cited by 2 publications

References 40 publications

Experimental investigation of condensation heat transfer on vertically inclined grooved aluminium surfaces

Experimental investigation of condensation heat transfer on vertically inclined grooved aluminium surfaces

Experimental Study of Condensation Heat Transfer and Droplet Dynamics on Multiple Horizontal Copper Tubes with Superhydrophobic Characteristics

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