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 16 publications

(8 citation statements)

References 40 publications

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“…At present, scholars have investigated factors such as flow pattern, physical properties (Bohdal et al, 2019), pipe diameter (Klahm et al, 2010), and mass flow rate (Chun and Seon-Oh, 2000), and have established a relatively comprehensive flow pattern for the condensation heat transfer and pressure drop of single component (Dorao and Fernandino, 2022) and multi-component (He et al, 2020) working fluids in horizontal pipes. To enhance the condensation performance, the inner surface of the pipe can be modified using surface modification techniques to reduce the thermal resistance of Frontiers in Energy Research frontiersin.org the liquid film, which can be achieved by adding different types of fins (Ho et al, 2019), grooves (Stallbaumer-Cyr et al, 2022), or inserts (Ahmadi Moghaddam et al, 2020). This can increase the effective heat transfer area, increase the disturbance effect on the flow, and make the liquid generate centrifugal force to accelerate the transition of the flow pattern inside the tube from stratified flow to annular flow.…”

Section: Introductionmentioning

confidence: 99%

Research on the thermal performance of the condenser in a loop heat pipe anti-icing system

Zhao,

Li,

Dang

et al. 2023

Front. Energy Res.

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Loop Heat Pipes (LHPs) are efficient heat transfer devices, providing a highly efficient and energy-saving thermal control integrated management method for Unmanned Aerial Vehicles (UAVs) with their flexible structural design. In this paper, a conceptual design of LHP anti-icing system was proposed, using LHP to transfer waste heat to wing’s leading edge. The outer surface temperature of wing skin is one of the main indicators to measure the anti-icing effect. As a result, this paper mainly focused on the heat transfer process of the condenser section by experimental and numerical simulation methods. A stainless steel-nickel LHP was fabricated and tested at different conditions. Volume of Fluid (VOF) method and Lee model were adopted to simulate the condensation process. Results showed that increasing the heating power (from 35 W to 60 W) slowed down the condensation and lengthened the two-phase zone. However, when the angle of attack changes within the range of 0°–10°, the liquid-vapor distribution in the tube remains almost unchanged. The average error of surface temperature between experiment and simulation results is 3.6% and 2.5% for the heating power of 180 W and 60 W respectively. Additionally, because the volume of water droplets collected is the largest at the leading edge of the wing, we recommend arranging the LHP condenser tube inlet near the leading edge of the wing and increasing the density of pipe arrangement to achieve better anti-icing effect.

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Section: Introductionmentioning

confidence: 99%

Research on the thermal performance of the condenser in a loop heat pipe anti-icing system

Zhao,

Li,

Dang

et al. 2023

Front. Energy Res.

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“…The mean absolute relative difference was 8.63%, and the prediction effect was more accurate. Moghaddam et al [21] investigated the condensation two-phase flow heat transfer process of R600a in a twisted enhanced tube, which was a copper tube with inner diameter of 8.1 mm and length of 1000 mm. As indicated by the results, the insertion of bonds cannot be constantly beneficial, unless only the heat transfer efficiency is considered.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Condensation Flow and Heat Transfer Characteristics Inside Spiral Tubes

Chen

Jiang

et al. 2023

Energies

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Spiral wound tube heat exchanger (SWHE) was confirmed as the core equipment of natural gas liquefaction (LNG). However, there was rare experimental research on large-scale SWHE for LNG, and the theory of heat transfer is not perfect. To investigate the tube-side flow and heat transfer characteristics in spiral tubes, an experimental system was proposed. To ensure the accuracy of the experimental data, the heat transfer coefficients of liquid propane under different conditions were measured, and the data acquired through the experiment were compared with two classical heat transfer correlation (Dittus–Boelter and Geielinski) under the identical working conditions. The applicability of the existing correlation was analyzed using the experimental data, and a novel heat transfer correlation was developed. As indicated by the results, the deviation between the experimental system and the classical correlation under the identical working condition was lower than ±10%. Furthermore, the error comparison between the novel correlation prediction value and the experimental data was less than ±15%.

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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%

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

Cited by 16 publications

References 40 publications

Research on the thermal performance of the condenser in a loop heat pipe anti-icing system

Research on the thermal performance of the condenser in a loop heat pipe anti-icing system

Analysis of Condensation Flow and Heat Transfer Characteristics Inside Spiral Tubes

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

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