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- W4292329181 abstract "An experiment of air-water two-phase co-current upward flow has been conducted in adiabatic vertical channels under atmospheric conditions to investigate the frictional pressure drop affected by cross-sectional sizes of rectangular channels. Four channels with a cross-section of 4 × 66 mm, 6 × 66 mm, 8 × 66 mm, 10 × 100 mm were selected, and the superficial velocities of water and air were 0.25–3 and 0–20 m/s, respectively. The void fraction was measured by flat electrodes. Based on the Lockhart-Martinelli and Chisholm correlations, the result shows that with the increase of the hydraulic diameter of the channel, the parameter C rises to 28. In this study, the mechanism of frictional pressure drop was analyzed, and a new model was proposed based on the Chisholm model. In addition, the other frictional multiplier model was proposed based on the effects of void fraction, Reynolds number , and hydraulic diameter. Both of the models proposed in this study can predict the frictional pressure drop in rectangular channels well with a high accuracy, and the errors are below 15% in most conditions. • According to the results, the frictional multiplier is a function of void fraction, Reynold number and hydraulic diameter. • A new model based on correlation of Chisholm is proposed and the error of the proposed model is below 24%. • The other new model which based on the definition of the frictional multiplier is proposed and have an error lower than 15%." @default.
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- W4292329181 date "2022-10-01" @default.
- W4292329181 modified "2023-09-30" @default.
- W4292329181 title "Research on frictional pressure drop of air-water Co-current upward flow in vertical rectangular channels with different sizes" @default.
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- W4292329181 doi "https://doi.org/10.1016/j.pnucene.2022.104377" @default.
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