Condensation heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tape inserts

Moghaddam, Hadi Ahmadi; Sarmadian, Alireza; Asnaashari, Amirmasoud; Joushani, Hossein Ahmadi Nejad; Islam, Mohammad S.; Saha, Suvash C.; Ghasemi, Golara; Shafaee, Maziar

doi:10.1016/j.ijrefrig.2020.06.019

Cited by 14 publications

(3 citation statements)

References 36 publications

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“…For designs appropriate to these industries, a precise and profound basic understanding of flow patterns and also the heat transfer phenomenon is essential. [1][2][3][4][5][6] Condensation in industrial utilizations typically happens on surfaces, which appears as a liquid film: filmwise condensation (FWC), droplets: dropwise condensation (DWC), or a combination of both. 7,8 Condensation generally occurs if the surface temperature is reduced to a temperature less than the local saturation temperature of the adjacent vapor.…”

Section: Introductionmentioning

confidence: 99%

“…Condensation is an important process that plays a remarkable role in numerous industries such as power generation, aerospace engineering, chemical, and refrigeration. For designs appropriate to these industries, a precise and profound basic understanding of flow patterns and also the heat transfer phenomenon is essential 1–6 . Condensation in industrial utilizations typically happens on surfaces, which appears as a liquid film: filmwise condensation (FWC), droplets: dropwise condensation (DWC), or a combination of both 7,8 .…”

Section: Introductionmentioning

confidence: 99%

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Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

2022

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Recently, achieving an ameliorated heat transfer rate in dropwise condensation (DWC) has attracted the attention of many researchers. Several parameters, including chemical and physical properties of the substrate, inclination, and interfacial characteristics influence DWC heat transfer rate. The variation of inclination angle is followed by the change in droplet shape and consequently, the heat transfer rate are changed. In this study, the effect of droplet shape variation on diverse inclined substrates is simulated. Moreover, three‐dimensional mass, momentum, and energy equations considering the desired boundary conditions on the unstructured grid are utilized for the scrutinization of flow behavior and heat transfer for static and sliding droplets. For the sake of validation, the outcomes obtained from the simulation were compared with existent data in the literature and a proper agreement was attained. Regarding the outcomes, it was of concern that the influence of inclination angle on the droplet shape is more distinct at higher droplet volume; while no considerable change was seen on heat flux of small droplets by increasing the inclination angle. Furthermore, a higher heat transfer rate was noted by exceeding the inclination angle beyond a definite angle. Additionally, the increased heat transfer rate was affirmed by increasing the Marangoni number ( italicMa ) $({Ma})$.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

2022

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“…1,2 A precise and profound fundamental understanding of flow patterns and the heat transfer phenomenon is essential to have the means for devising appropriate designs for diverse industries. [3][4][5][6][7][8][9] In condensation, the condensate either forms a film of liquid on the surface which is called filmwise condensation (FWC), condenses as droplets (DWC), or a combination of both. 10,11 DWC is a phase-change process where vapor changes to liquid in the form of discrete drops on an unwetted surface, 12 which due to its high efficiency, has received much attention from investigators.…”

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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Numerical evaluation of the effect of using various twisted-tape geometries on heat transfer enhancement and flow characteristics in a tube

Taheripour

Saffarian

Azimy

et al. 2023

J Therm Anal Calorim

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Condensation heat transfer and pressure drop characteristics of Isobutane in horizontal channels with twisted tape inserts

Cited by 14 publications

References 36 publications

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

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

Numerical evaluation of the effect of using various twisted-tape geometries on heat transfer enhancement and flow characteristics in a tube

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