Experiments on Convection Heat Transfer Along a Vertical Flat Plate Between Pools with Different Temperatures

Kataoka, Yuki; Fukui, Taichiro; Hatamiya, Shigeo; Nakao, Toshitsugu; Naitoh, Masanori; Sumida, Isao

doi:10.13182/nt92-a34722

Cited by 40 publications

(5 citation statements)

References 3 publications

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“…Interestingly, in the most straightforward MGGP correlations delineated in Equations ( 50)-( 52) the condensation HTC is solely determined by the ratio w nc / 1 − w nc . This is identical to the simplest empirical correlations advanced by Uchida et al [6], Tagami [105], Kataoka et al [110], and Murase et al [111]. The correlations extrapolated from experimental data were contrasted with the condensation HTC as prophesied by the third correlation.…”

Section: Steam Condensation Heat Transfer Based On Machinesupporting

confidence: 68%

Steam Condensation Heat Transfer in the Presence of Noncondensable Gases (NCGs) in Nuclear Power Plants (NPPs): A Comprehensive Review of Fundamentals, Current Status, and Prospects for Future Research

Albdour,

Addad,

Alyammahi

et al. 2024

International Journal of Energy Research

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Efficient steam condensation is crucial for safe nuclear power plant (NPP) operations, preventing pressure buildup, overheating, and the release of radioactive materials. However, the presence of noncondensable gases (NCGs), such as air, nitrogen, hydrogen, or helium, can hinder the condensation process by creating a thermal resistance layer that impedes steam diffusion and condensation on the system’s surface. Maximizing the efficiency of steam condensation requires a thorough grasp of the fundamental processes, theories, advancements, and technical hurdles. Therefore, this work thoroughly addresses these needs, with a particular emphasis on addressing the challenges posed by NCGs by dividing the work into four thematic areas. The first theme relates to a comprehensive examination of pure steam condensation phenomena, which includes an exploration of familiar condensation scenarios and various film condensation types. The second theme examines condensation in the presence of NCGs, their mixture properties, and related theories and modelling of heat and mass transfer. The third theme investigates condensation in NPP by exploring passive cooling systems and condensation phenomena under both natural and forced convection conditions during nuclear accidents, the origin of NCGs in NPP and their transportation aspects. This is followed by experimental work related to condensation scenarios and scale. Finally, the last theme looks upon the recent advancements in computational fluid dynamics (CFD) modelling of wall condensation, system analysis codes coupling with CFD, and the implementation of machine learning (ML) for predicting the condensation HTC. By bridging the gap between fundamental knowledge and practical applications, the four thematic areas presented in this work are aimed at providing a comprehensive foundation for researchers and experts in the field of steam condensation when NCGs are involved. The ultimate objective is to bolster the safety and efficacy of NPP operations by understanding the heat and mass transfer mechanisms while mitigating the risk of catastrophic events.

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Section: Steam Condensation Heat Transfer Based On Machinesupporting

confidence: 68%

Steam Condensation Heat Transfer in the Presence of Noncondensable Gases (NCGs) in Nuclear Power Plants (NPPs): A Comprehensive Review of Fundamentals, Current Status, and Prospects for Future Research

Albdour,

Addad,

Alyammahi

et al. 2024

International Journal of Energy Research

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“…In the past, the most often used semi-empirical correlations to evaluate the condensation heat transfer coefficient in presence of high gas concentration (in particular, in containment thermal hydraulic analyses) and derived from the experimental database of Uchida [7], Tagami [8] and Kataoka [9], were the following:…”

Section: Results For the Air-steam Mixture Condensationmentioning

confidence: 99%

Experimental Investigation on Pure Steam and Steam-Air Mixture Condensation Inside Tubes

Caruso¹,

Giannetti²,

Naviglio³

2012

IJHT

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Experiments on steam condensation inside inclined tubes were carried out with the following aims: a) to investigate the physical phenomena involved in condensation of steam within tubes; b) to study the influence of the geometry (namely, tube inclination) on the heat transfer rate, also in presence of high concentration of non-condensables; c) to develop models and heat transfer correlations for these conditions; d) to produce a database for modeling in-tube condensation with high percentage of non-condensable gases. Steam and steam-air condensation experiments were carried out in gravity controlled stratified flow regime inside a horizontal and inclined tube (22 mm inside diameter) and the average heat transfer coefficient has been evaluated. For pure steam condensation, the experimental data were compared with literature correlations and their agreement has been verified, suggesting some minor modifications. A limited influence of tube inclination on heat transfer has been observed: condensation in the presence of non-condensable gases is not sensibly affected by inclination, especially at high gas concentrations. Two empirical correlation are proposed to be used in the preliminary design of a condenser in a passive containment cooling system, as in thermal-hydraulic simulation, especially in transient conditions, when a high gas concentration is present.

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“…Stratification and mixing phenomena in a large pool of water with a heat source have been studied experimentally and analytically. A strong stratification above a heat source submerged in a water pool was observed in different tests [11][12][13][14][15][16][17][18][19][20]. Heat transfer into the layer below the heat and momentum source was found to be limited by thermal conduction.…”

Section: State Of the Art Reviewmentioning

confidence: 99%

Approach and Development of Effective Models for Simulation of Thermal Stratification and Mixing Induced by Steam Injection into a Large Pool of Water

Hua

Villanueva

Kudinov

2014

Science and Technology of Nuclear Installations

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Steam venting and condensation in a large pool of water can lead to either thermal stratification or thermal mixing. In a pressure suppression pool (PSP) of a boiling water reactor (BWR), consistent thermal mixing maximizes the capacity of the pool while the development of thermal stratification can reduce the steam condensation capacity of the pool which in turn can lead to pressure increase in the containment and thereafter the consequences can be severe. Advanced modeling and simulation of direct contact condensation in large systems remain a challenge as evident in commercial and research codes mainly due to small time-steps necessary to resolve contact condensation in long transients. In this work, effective models, namely, the effective heat source (EHS) and effective momentum source (EMS) models, are proposed to model and simulate thermal stratification and mixing during a steam injection into a large pool of water. Specifically, the EHS/EMS models are developed for steam injection through a single vertical pipe submerged in a pool under two condensation regimes: complete condensation inside the pipe and chugging. These models are computationally efficient since small scale behaviors are not resolved but their integral effect on the large scale flow structure in the pool is taken into account.

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Experiments on Convection Heat Transfer Along a Vertical Flat Plate Between Pools with Different Temperatures

Cited by 40 publications

References 3 publications

Steam Condensation Heat Transfer in the Presence of Noncondensable Gases (NCGs) in Nuclear Power Plants (NPPs): A Comprehensive Review of Fundamentals, Current Status, and Prospects for Future Research

Steam Condensation Heat Transfer in the Presence of Noncondensable Gases (NCGs) in Nuclear Power Plants (NPPs): A Comprehensive Review of Fundamentals, Current Status, and Prospects for Future Research

Experimental Investigation on Pure Steam and Steam-Air Mixture Condensation Inside Tubes

Approach and Development of Effective Models for Simulation of Thermal Stratification and Mixing Induced by Steam Injection into a Large Pool of Water

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