Research of Flow Boiling Bubble Dynamics in Vertical Rectangular Mini-channel

Guo, Lei; Zhang, Shusheng; Chen, Yaqun; Cheng, Lin

doi:10.1109/apped.2010.11

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…At a high subcooling degree, the liquid-vapor interface was dominated by Marangoni heat flux at the initial stage of nucleation. Guo et al [8] researched on bubble dynamics in one-side heating wall and built bubble growth model, the fluid field was divided into three zones, including bubble generating zone, growth zone and annihilation zone. Obviously, observing bubble behaviour is convenient by VOF visual simulation for SFB study.…”

Section: Introductionmentioning

confidence: 99%

Visualization of subcooled flow boiling by simulation

Sun

Wang

2023

Second International Conference on Statistics, Applied Mathematics, and Computing Science (CSAMCS 2022)

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A two-dimensional visual simulation was conducted to study bubble behavior of R134a on the heating wall in subcooled flow boiling. It’s observed that bubble growth process experienced nucleation, sliding and departure on the heating wall at condition of heat flux of 300 kW/m2, velocity of 0.4 m/s, subcooling degree of 3 K and saturated temperature of 288.15 K. The results show that the bubble nucleated with large size at nucleation state, and the bubble size increased with sliding. This series of bubble behaviors was subjected to surface tension, buoyance, shear lift force and liquid inertial force. Besides, the temperature of R134a along radial direction varied linearly near the heating wall.

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Section: Introductionmentioning

confidence: 99%

Visualization of subcooled flow boiling by simulation

Sun

Wang

2023

Second International Conference on Statistics, Applied Mathematics, and Computing Science (CSAMCS 2022)

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“…And the flow details in a tube, for example, bubble behavior, can be detailed clearly by CFD. In recent years, research on subcooled flow boiling through numerical simulation has become popular [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Subcooled Flow Boiling in a Threaded Tube and Investigation of Heat Transfer and Bubble Behavior

Lei,

Wang,

Xie

et al. 2023

Energies

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Three-dimensional subcooled flow boiling of R134a in a threaded tube was numerically simulated at the conditions of 200~400 kW/m2 heat flux, 3~20 K inlet subcooling, and 0.2~0.6 m/s inlet velocity. The bubble behavior in the horizontal threaded tube with 0.581 mm thread tooth height was observed. The effect of heat flux, inlet subcooling, and inlet velocity on bubble departure diameter and heat transfer coefficient were explored. The results presented the whole growth process of five kinds of bubbles. It was found that the bubbles either collapsed in cold liquid after leaving the heating wall or grew along the axial direction and contacted the heating wall. And there was no bubble sliding during the growth. In addition, the most important and special characteristic of bubble behavior in threaded tubes was the phenomenon of the bubble passing through the cavity. The coalescence and breakup behavior occurred after the bubble passed through the cavity. According to the discussions of the departure diameter and heat transfer coefficient, it was inferred that the bubble departure diameter increased with the increase of heat flux from 200~400 kW/m2 and subcooling from 3~20 K while decreasing with the increase of inlet velocity from 0.2~0.6 m/s. And due to the influence of the threaded tube structure, there are special points in the change of bubble departure diameter. The heat transfer coefficient of the bubbles in the threaded tube was higher than the smooth tube, which was increased by 1.5~12.5%. The heat transfer coefficient increased with the increase of heat flux and subcooling and is closely related to the bubble departure diameter.

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“…The flow pattern observed in simulation corresponded to the experiment in a certain range. Guo et al [20] researched bubble dynamics in a one-side heating wall and built a bubble growth model with a VOF model. The results showed that the fluid field was divided into three zones, including bubble generating zone, growth zone, and annihilation zone, and the three zones changed with bubble motion.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Research of Bubble Characteristics and Bubble Departure Diameter in Subcooled Flow Boiling

Wang

Xie

et al. 2022

Mathematics

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Three-dimensional subcooled flow boiling of R134a in a horizontal tube was simulated by a VOF (volume of fluid) model combined with the level set method. Bubble characteristics were explored at heat flux of 0.3 MW/m2, inlet subcooling of 3 K, and inlet velocity of 0.4 m/s. It was observed that five representative bubbles occurred in subcooled flow boiling, including sliding bubble, coalescing bubble, non-departed bubble, bouncing bubble, and continuous-boiling bubble. The results showed that the bubble radial velocity was an important factor of bubble departure after a sliding process. Moreover, the effect of heat flux, inlet velocity, and inlet subcooling on bubble departure diameter were investigated. The departure diameter increased with increasing inlet velocity from 0.2 to 0.4 m/s and heat flux from 0.2 to 0.4 MW/m2, while diameter decreased with inlet subcooling from 3 to 10 K. Finally, based on the influence of heat flux, inlet velocity, and inlet subcooling on average departure diameter of the bubble except the coalescing bubble, a model was proposed to predict the average departure diameter. The deviation of the model was within 5%.

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Research of Flow Boiling Bubble Dynamics in Vertical Rectangular Mini-channel

Cited by 6 publications

References 5 publications

Visualization of subcooled flow boiling by simulation

Visualization of subcooled flow boiling by simulation

Numerical Simulation of Subcooled Flow Boiling in a Threaded Tube and Investigation of Heat Transfer and Bubble Behavior

Numerical Simulation Research of Bubble Characteristics and Bubble Departure Diameter in Subcooled Flow Boiling

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