An experimental investigation of pure steam and steam–air mixtures condensation outside a vertical pin-fin tube

Tong, Pan; Fan, G. J.; Sun, Zhongning; Ding, Ming; Su, Jian

doi:10.1016/j.expthermflusci.2015.08.009

Cited by 40 publications

(6 citation statements)

References 26 publications

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“…Для інтенсифікації тепломасообмінних процесів у плівкових апаратах з вертикальною теплообмінною поверхнею використовують різноманітне оребрення [1][2][3][4][5][6][7][8][9][10]. Враховуючи тісний зв'язок питань гідродинаміки плівки рідини та інтенсивності теплообміну, доцільно проаналізувати основні параметри плівки та мінімальної щільності зрошення рідиною поверхні з повздовжнім оребренням.…”

Section: мета дослідженняunclassified

Study of the Hydrodynamics of the Liquid Film Flow on a Vertical Surface With Longitudinal Finning

Barabash¹,

Solomakha²,

Sereda³

et al. 2020

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

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Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського» ДОСЛІДЖЕННЯ ГІДРОДИНАМІКИ ПРИ ТЕЧІЇ ПЛІВКИ РІДИНИ ВЕРТИКАЛЬНОЮ ПОВЕРХНЕЮ З ПОВЗДОВЖНІМ ОРЕБРЕННЯМ Розглянуто особливості розподілу плівки рідини при її течії по вертикальній поверхні з поздовжніми ребрами. На основі аналізу сил, які діють у плівці рідини при відсутності міжфазного тертя між рідиною та газовим середовищем, отримані залежності, які описують форму поверхні рідини у міжреберному проміжку. Показано, що коли густина зрошення більша за мінімальну, при якій оребрена поверхня буде гарантовано повністю змоченою (мінімальна товщина плівки на середині міжреберного проміжку >0), поверхня плівки рідини приймає форму з рівною кривизною. В залежності від конкретних поперечних геометричних розмірів труби, ребра і міжреберного проміжку поверхня рідини може мати як ввігнуту, так і випуклу форму. Отримані результати дають можливість визначити граничні умови на міжфазній поверхні (рідинагаз), які необхідні для аналітичних та експериментальних досліджень гідродинаміки і тепломасообміну при течії рідини по вертикальній оребреній поверхні. Ключові слова: плівка рідини, поздовжнє оребрення, мінімальна густина зрошення, краєвий кут змочування, інтенсифікація процесів тепломасообміну.

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Section: мета дослідженняunclassified

Study of the Hydrodynamics of the Liquid Film Flow on a Vertical Surface With Longitudinal Finning

Barabash¹,

Solomakha²,

Sereda³

et al. 2020

ENERHETYKA: ekonomika, tekhnolohiyi, ekolohiya

View full text Add to dashboard Cite

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“…In addition, condensation by forced and free convection was studied on tubes [31] and data obtained for many different types of tubes with different pressures and geometries. The transfer of heat was found to be significantly enhanced when the velocity was increased [32][33][34][35]. The coefficient of heat transfer relating to this kind of condensation was derived by Rose and Briggs.…”

Section: Introductionmentioning

confidence: 96%

Investigation of Condensate Retention on Horizontal Pin-Fin Tubes Using Water-Propanol Mixture

2022

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Condensers are an integral part of air conditioning systems. The thermal efficiency of condensers solely depends on the rate of heat transfer from the cooling medium. Fin tubes are extensively used for heat transfer applications due to their enhanced heat transfer capabilities. Fins provide appreciable drainage because surface tension produces pressure gradients. Much research, contributed by several scientists, has focused on adjusting parameters, such as fin design, flow rates and retention angles. In this study, a setup with an observing hole was used to inspect the influence on retention angle of adjusting the flow rates of the fluid. The increase in retention angle was examined using several velocities and concentration mixtures. Pin-fin tubes were used to obtain coherent results using a photographic method. The experimental setup was designed to monitor the movement of fluid through the apparatus. The velocity was varied using dampers and visibility was enhanced using dyes. Photographs were taken at 20 m/s velocities after every 20 s. and 0.1% concentration and the flooding point observed. The experimental results were verified by standard observation which showed little variation at lower velocity. For water/water-propanol mixtures, a vapor velocity of 12 m/s and concentration ratio of 0.04% was the optimal combination to achieve useful improvement in retention angle. With increase of propanol from 0% to 0.04%, the increase in retention angle was greater compared to 0.04% to 0.1%. For velocities ranging from 0 to 12 m/s, the increase in retention angle was significant. A sharp change was observed for concentration ratios ranging from 0.01% to 0.05% compared to 0.05% to 0.1%.

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“…In particular, with the development of seawater desalination and the nuclear power industry, the condensation heat transfer with a non-condensable gas is becoming a research focus. Earlier results studied few possibly trace amounts, of non-condensable gases [4,8] , geometries [16][17][18][19][20][21][26][27][28] , and flow patterns [6,29] , while only a few experiments involved the condensation heat transfer process with a high fractional non-condensable gas [7,15,[30][31][32][33][34] . The general trend the research follows is: attaining a more reasonable experimental system design, and then increased reliability of the measurement of variable parameters, especially the temperature of the condensing plate, temperature of the bulk vapor mixture, and gas-liquid interface temperature.…”

Section: ．Introductionmentioning

confidence: 99%

“…Experiments with non-condensable gases ranging from 30% to 65% were conducted on a vertically mounted tube to evaluate the heat removal capacity of a passive cooling unit in a post-accident containment by Liu [15] . Tong [30] used a pin-fin tube in the condensation of pure steam and steam-air. He found that the enhancement ratio would maximally reach 1.8 with an air mass fraction larger than 90%.…”

Section: ．Introductionmentioning

confidence: 99%

Condensation of steam with high CO2 concentration on a vertical plate

Wang

Zhao

et al. 2016

Experimental Thermal and Fluid Science

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The effect of a non-condensable gas on steam condensation has been studied. From experimental and theoretical studies to date, clear evidence of significant heat transfer deterioration by the non-condensable gas can be seen. The deterioration varies with the concentration of the non-condensable gas, geometric parameters, system pressure, etc. However, these data and correlations may be unreliable due to the high concentration of CO 2 in the vapor mixture and lack of verification through experiments. In this paper, a systematic investigation has been conducted for film-wise condensation using a vapor mixture of steam and a high concentration of CO 2 . Some data were obtained on a vertical plate, with the average vapor velocity of 1.2 m/s, CO 2 mass fraction of 20%-94% and a pressure of 1 atm. The effects of CO 2 concentration and surface sub-cooling on heat transfer characteristics have been investigated. Moreover, the relevant parameters such as gas/liquid film resistance were included in the description of the condensation phenomenon. The developed correlation for steam and a high concentration of CO 2 , based on experimental results, has a standard deviation of less than ±20%.

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An experimental investigation of pure steam and steam–air mixtures condensation outside a vertical pin-fin tube

Cited by 40 publications

References 26 publications

Study of the Hydrodynamics of the Liquid Film Flow on a Vertical Surface With Longitudinal Finning

Study of the Hydrodynamics of the Liquid Film Flow on a Vertical Surface With Longitudinal Finning

Investigation of Condensate Retention on Horizontal Pin-Fin Tubes Using Water-Propanol Mixture

Condensation of steam with high CO2 concentration on a vertical plate

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