Steam condensation in the presence of non-condensable gas inside a nearly horizontal tube under separated flow

Ahn, Taehwan; Moon, Joonho; Kang, Jinhoon; Jeong, Jae Jun; Yun, Byong-Jo

doi:10.1016/j.ijheatmasstransfer.2022.123351

Cited by 8 publications

(2 citation statements)

References 26 publications

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“…In the experimental aspect, the main research directions focus on the heat transfer characteristics of film condensation under different working conditions and the heat transfer enhancement by variant surface properties (Anderson et al, 1998;Ahn et al, 2022). Al-Diwany and Rose (1973) studied the condensation of an air, argon, nitrogen, and water vapor mixture on a vertical plate under natural convection, and the experimental results are in good agreement with the theoretical solution.…”

Section: Introductionmentioning

confidence: 76%

A numerical study on film condensation of steam with non-condensable gas on a vertical plate

Wei

Wang³

2023

Front. Energy Res.

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The film condensation of steam is very common in several industrial areas, such as condensers in power plants, seawater desalination, and air-conditioning systems. In some studies, the non-condensable gas and liquid film are overlooked for the sake of simplicity. To provide an integral computational scheme, in the present study, the film condensation of steam in the presence of non-condensable gas on a vertical plate has been simulated using a two-dimensional CFD model combining a wall condensation model and volume of fluid (VOF) model. After verification, the proposed computational scheme is used to simulate the steam condensation process, with the mass fractions of non-condensable gas varying from 5% to 45%. The results indicate that the concentration of non-condensable gas in the boundary layer decreases gradually with the condensation process, resulting in a decline in the synergy between temperature and velocity field. It can also be found that the fluctuation of the liquid film can influence the concentration distribution of the non-condensable gas layer. For cases with high concentrations of steam, the thermal resistance of liquid film can reach more than 20% of the total thermal resistance, which should not be ignored.

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Section: Introductionmentioning

confidence: 76%

A numerical study on film condensation of steam with non-condensable gas on a vertical plate

Wei

Wang³

2023

Front. Energy Res.

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“…Increasing pressure can raise the dew point temperature of vapor in humid air, which make the condensation process more efficient and rapid, thereby simplifying the system and reducing energy consumption. However, no scholars have conducted specialized research on positive-pressure condensation dehumidification [5], so this study uses the VOF to simulate condensation process of moist air in tube channels, further studying the moist air and providing a certain theoretical basis and scientific guidance for strengthening heat transfer of moist air.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of pressure in humid air dehumidificationournal

Wang,

Wang

2024

J. Phys.: Conf. Ser.

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In this paper, there are problems such as large energy consumption and complex system in the field of condensation dehumidification. It is found that increasing pressure can strengthen the effect of condensation dehumidification, simplify the system and reduce energy consumption. So this paper simulates the condensation and dehumidification process of humid air in horizontal pipe under positive pressure. The results show that the dehumidification capacity increases by 25%∼30% when the pressure increases by 100kPa on average. The increase of pressure has little effect on the heat transfer coefficient, but the increase of humidity increases the heat transfer coefficient more obvious. When the humidity of wet air increases by 20%, the heat transfer coefficient increases by 18% ∼ 33%. The dehumidification capacity and heat transfer coefficient increase with the increase of pipe diameter and fluid flow rate.

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Thermal-hydraulic characteristics analysis of steam–air condensation in vertical porous-wall corrugated tubes

Liu,

Chen

2024

Applied Thermal Engineering

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Steam condensation in the presence of non-condensable gas inside a nearly horizontal tube under separated flow

Cited by 8 publications

References 26 publications

A numerical study on film condensation of steam with non-condensable gas on a vertical plate

A numerical study on film condensation of steam with non-condensable gas on a vertical plate

Study on the effect of pressure in humid air dehumidificationournal

Thermal-hydraulic characteristics analysis of steam–air condensation in vertical porous-wall corrugated tubes

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