Rate of droplet deposition in steam–water annular flow and effect of a flow obstacle

Okawa, Tomio; Murakami, Toshihiro; Takei, Rei

doi:10.1016/j.nucengdes.2011.04.003

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…It is considered that the droplets entrainment is composed of two different mechanisms of droplets formation: the wave entrainment (m ew ) and the boiling entrainment (m eb ). The wave entrainment rate caused by breakup of disturbance wave can be evaluated by the equations given by Okawa et al 12 m ew = r l min k e1 p e1 k e2 p 0:5 e1 k e3…”

Section: Closed Equations Of Annular Flow Modelmentioning

confidence: 99%

“…Holowach et al 11 developed an upward co-current annular flow model based on a force balance and stability analysis and predicted the liquid droplet entrainment rate of annular flow region. Okawa et al 12 measured deposition rate of droplets in vapor-water annular two-phase flow in a 5mm-diameter vertical circular tube and presented the correlations for liquid droplet deposition rate. The mechanism of entrainment and deposition of annular flow is analyzed based on different assumptions and research methods, and the correlations for droplet entrainment rate and droplet deposition rate under different conditions are given by Ueda et al, 13 Okawa and Kataoka, 14 Schubring and Shedd, 15 Paleev and Filippovich, 16 Kataoka et al, 17 and Hewitt and Govan.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of annular upward flow in vertical narrow channel heated from one side

Lei

et al. 2017

Advances in Mechanical Engineering

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A theoretical model of annular upward flow in vertical narrow channel heated from one side has been developed based on the fundamental conservation equations of the vapor core and liquid film. The experimental verification is performed to research on the flow boiling and heat transfer characteristics by setting up visualization platform with the channel that heated from one side. Through solving the closed equations of proposed model by numerical method, the film heat transfer coefficient for vertical two-phase flow is obtained. The results show a good agreement for the local heat transfer coefficient between theoretically calculated results and experimental data. Its mean absolute percentage error is 13.8%. With the applications of the proposed model, further study on the effects of several parameters (such as the cross-sectional width, mass velocity, and effective heat flux) on the liquid film thickness along the channel and radial velocity distributions in the liquid film are conducted.

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Section: Closed Equations Of Annular Flow Modelmentioning

confidence: 99%