Bubble Behavior and Mean Diameter in Subcooled Flow Boiling

Zeitoun, O.; Shoukri, M.

doi:10.1115/1.2824023

Cited by 174 publications

(45 citation statements)

References 17 publications

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“…The bubble departure diameter of the dispersed phase played a key role in the two-phase flow and heat transfer process and has a close relationship with the surface subcooling. Previously, the relationship between the surface subcooling and the bubble departure diameter was obtained from the experimental data [39][40][41][42] and empirical formula [43]. In this study, it can be seen from the numerical calculation that bubble departure diameter increased as surface subcooling increased.…”

Section: Characteristics Analysis Of Evaporation and Condensationmentioning

confidence: 83%

Simulation of the Vapor-Liquid Two-Phase Flow of Evaporation and Condensation

Hong-jie¹,

Zhang²,

Li³

et al. 2016

IJHT

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The heat pipe receiver with integrated high temperature latent thermal energy storage is one of the key components of Solar Dynamic Space Power System (SDPSS), among which the evaporation and condensation is the main heat transfer mode, a very complicated two-phase flow. However, research on the two-phase flow and heat transfer characteristics is an effective way to improve the system efficiency and reduce the system mass. So a two-dimensional physical model was built and the volume of fluid (VOF) technique was used to model the interaction between the two phases. The UDF (Users Define Function) was introduced to handle the mass source terms. In the study, the relationship between superheat, subcooling and wall heat flux were investigated. In addition, the flow pattern of bubbles in the tube was analyzed. Compared with the churn bubbles flow, the heat transfer coefficient of the bubbles flow was much higher. Bubble departure diameter increased as surface subcooling increased. The work in this paper lays a good foundation for the further research on the heat transfer characteristics of heat pipe receiver with integrated high temperature latent thermal energy storage.

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Section: Characteristics Analysis Of Evaporation and Condensationmentioning

confidence: 83%

Simulation of the Vapor-Liquid Two-Phase Flow of Evaporation and Condensation

Hong-jie¹,

Zhang²,

Li³

et al. 2016

IJHT

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“…The research group at McMaster University, Canada (Zeitoun and coworkers) 63,64) carried out the measurement of the interfacial area concentration in a boiling two-phase flow along with a nonboiling air-water two-phase flow described above. They carried out experiments for vertical upward subcooled boiling two-phase flow of water near atmospheric pressure (0.117-0.166 MPa) in the annulus where the inner pipe is heated.…”

Section: Measurement Of Interfacial Area Concentration In Boiling Systemmentioning

confidence: 99%

Development of Research on Interfacial Area Transport

Kataoka

2010

Journal of Nuclear Science and Technology

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Interfacial area concentration and its transport model are quite important in two-fluid model analysis of gas-liquid two-phase flow, which is widely used for the thermal hydraulic analysis of nuclear reactors. Recent developments and the present status of research on interfacial area transport model were reviewed. The definition and rigorous formulation of interfacial area concentration were introduced. Based on this rigorous formulation, basic transport equations of interfacial area concentration were developed by several research groups. In the interfacial area transport equation, source and sink terms of interfacial area concentration are important, and detailed analyses of these terms were carried out, and constitutive equations based on bubble coalescence, bubble breakup, phase change, bubble expansion, and shrinkage due to pressure change were developed. These interfacial area transport equations and constitutive equations were installed in two-fluid model codes and the validities of these models were confirmed by experimental data. Experimental research studies on interfacial area concentration and its transport were also reviewed. Measurement methods of interfacial area concentration were reviewed and multiple-sensor probe methods were established and commonly used in experimental research. Considerable experimental works have been carried out for air-water two-phase flows, and detailed measurements of distributions on interfacial area concentration and their development in the flow direction were reported. For boiling twophase flow, experimental works on interfacial area concentration and its transport have been carried out and data are being accumulated. These data are used for the validation of interfacial area transport models.

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“…緒言強制対流サブクール沸騰では、強制対流熱伝達と核沸騰熱伝達が共存するため、高い伝熱性能が得られる [1]。このため、高発熱密度電子機器や核融合炉第一壁など、高熱流束除熱が要求される機器の冷却への応用が検討されている [2,3]。また、沸騰水型軽水炉(BWR)では、炉心内のサブクール沸騰域におけるボイド率が、燃料の燃焼度、圧力損失、二相流動安定性に影響を及ぼす [4,5]。このため、強制対流サブクール沸騰における伝熱及びボイド率発展のメカニズムを解明することは、工業的に重要な課題である。一方、サブクール沸騰域における気泡挙動を観察対象として、これまで数多くの可視化実験が行われている。この結果、発泡核上における気泡の成長と凝縮 [6]、鉛直伝熱面に沿う気泡のスライド上昇 [7,8]、鉛直伝熱面からの気泡離脱 [8][9][10] *+ $ù RST%&26 \b *+ 7Ö î ×H288 789 7Ö î *+ 9:7 8C& ,;<=>2 8 9 a c? 0*+ 9:78C& @642789…”

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Bubble Lift-off from a Vertical Heated Surface in Subcooled Pool Boiling

Miyano¹,

Okawa²

2016

JAPANESE JOURNAL OF MULTIPHASE FLOW

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Experiments were carried out to explore the mechanisms of bubble lift-off from a vertical heated surface in subcooled pool boiling. The experiments were conducted at atmospheric pressure and distilled water was used as the test fluid. A high speed camera was used for observation of bubble behavior. The main experimental parameters were the static contact angle of the heated surface, the liquid subcooling, and the wall heat flux. The time variation of bubble size was measured through image analysis. The growth force acting on the bubble was calculated using the measured time-evolution of the bubble size. The bubble growing on the vertical heated surface started to be extended in the horizontal direction when the sign of the growth force turned from negative to positive. It was hence considered that the growth force is one of the main causes of the bubble lift-off from a vertical heated surface. Furthermore, a correlation was developed for the bubble lift-off diameter considering the distribution of heat transfer rate around the bubble.

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Bubble Behavior and Mean Diameter in Subcooled Flow Boiling

Cited by 174 publications

References 17 publications

Simulation of the Vapor-Liquid Two-Phase Flow of Evaporation and Condensation

Simulation of the Vapor-Liquid Two-Phase Flow of Evaporation and Condensation

Development of Research on Interfacial Area Transport

Bubble Lift-off from a Vertical Heated Surface in Subcooled Pool Boiling

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