Development of a new empirical correlation for steam condensation rates in the presence of air outside vertical smooth tube

Fan, Guangming; Tong, Pan; Sun, Zhongning; Chen, Yitung

doi:10.1016/j.anucene.2017.11.021

Cited by 58 publications

(10 citation statements)

References 19 publications

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“…The inner tube was fixed in the casing by the two rubber stoppers; GHFS and thermocouple wires were let out through the upper stopper (Figure 19a). When studying film condensation, the tube's surface should be free of protruding parts and wires [25]. For this purpose, two rods with a diameter of 3 mm were mounted 9 mm from the test section, along which the wires were tapped (Figure 19b).…”

Section: Condensation On the Outer Surfaces Of The Tubesmentioning

confidence: 99%

Gradient Heatmetry Advances

Сапожников

Mityakov

et al. 2020

Energies

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The paper describes a unique method of heat flux measurement, i.e., gradient heatmetry. Gradient heatmetry is performed using gradient heat flux sensors (GHFS) developed on the anisotropic thermoelements basis. The principle of GHFS’ operation leads to the fact that their response time is about 10 ns, and the volt-watt sensitivity does not depend on the thickness. GHFS are compared with other types heat flux sensors, with the GHFS features depending on the materials being described. The theory and examples of gradient heatmetry applications in thermophysical experiment are provided.

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Section: Condensation On the Outer Surfaces Of The Tubesmentioning

confidence: 99%

Gradient Heatmetry Advances

Сапожников

Mityakov

et al. 2020

Energies

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“…At the same time, Lee et al found that the relationship between the non-condensable gas mass fraction and the heat transfer condensation is not linear, and the lower non-condensable gas mass fraction is sufficient to reduce the condensation heat transfer rate significantly [7]. Fan et al and Su et al found that the condensation HTC increases with the increase in gas-mixture pressure by experimental studies and numerical simulations [8,9]. Bian et al concluded that increasing the gasmixture pressure increased the gas mixture's density and the steam's diffusion coefficient in the gas mixture by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Time-Average Heat Transfer Coefficient for Steam-Air Condensation during the Dropping of Containment Pressure

Li¹,

Hui

Ke³

et al. 2022

Energies

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The passive containment cooling system (PCCS) has been applied in the new generation nuclear power plant. Previous studies mainly focused on steady-state heat transfer, but the actual heat transfer of PCCS is the transient process. Thus, investigating the transient heat transfer during the containment pressure dropping is necessary. The present study proposes a time-average condensation heat transfer coefficient (time-average condensation HTC) to characterize the intensity of transient condensation heat transfer. The time-average condensation HTC is defined as the heat absorbed per unit heat transfer area and per unit wall subcooling in a unit time. Experiments were performed to research the effect of initial gas-mixture pressure and air mass fraction on transient HTC. The result showed that the more significant gas-mixture pressure and lower air mass fraction could promote the transient-state heat transfer, especially the low air mass fraction. Based on the experimental result, a detailed empirical correlation for the time-average heat transfer coefficient is developed with an error of ±20%. Another simplified empirical correlation that only includes air mass fraction is also proposed to predict the transient heat transfer roughly. Besides, research on self-sustaining stability is also conducted to evaluate the stable operation characteristic of PCCS. The system can respond quickly and then run to a new steady state after interference during the long-term operation of PCCS. The phenomenon above implies that PCCS has good self-sustaining stability.

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“…For instance, Su with use of commercial computational fluid dynamics (CFD) software and experimental data, investigated the impact of air content on steam condensation process over a vertical surface [3]. Fan developed a new empirical correlation for steam condensation in terms of pressure, air content and wall subcooling in a vertical smooth tube [4]. Abadi examined numerically steam condensation process inside a long, inclined, smooth tube at different saturation temperatures with assumption of the flow field being three-dimensional, unsteady and turbulent [5].…”

Section: Introductionmentioning

confidence: 99%

Archives of Thermodynamics

Tokarski,

Ryfa,

Buliński

et al. 2020

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Combi-steamer condensation hoods are widely used in modern gastronomy. They condense steam produced by the combi-steamer and also filter solid particles, moisture, grease and smells. All these factors negatively affect the staff and dishes, so efficient work of the condensation hoods becomes important. A mathematical and experimental analysis of such a device is described in this paper. First a measurement methodology was designed and measurements of air humidity, temperature and mass flow rates were performed. The measurement procedure concerned dedicated a steam generator and combi-steamer. Next a mathematical model was developed. It was based on mass and energy balances of the condensation hood. The condensate flow rate turned out to be insufficient to fulfill the energy balance while measured directly. Hence, it was calculated from heater's power of the steam generator and the balance model was validated. The combisteamer had an unknown output, so the condensate flow rate was provided by the balance model after its validation. A preliminary diagnosis of the device was carried out as well.

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Development of a new empirical correlation for steam condensation rates in the presence of air outside vertical smooth tube

Cited by 58 publications

References 19 publications

Gradient Heatmetry Advances

Gradient Heatmetry Advances

Time-Average Heat Transfer Coefficient for Steam-Air Condensation during the Dropping of Containment Pressure

Archives of Thermodynamics

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