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Effect of solid particles in evaporating hot water tower on bubble movement

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Abstract

In this paper, a visualization experiment was conducted for multiphase flow in the evaporating hot water tower. The high-speed camera was used to record the motion of a single bubble above the 3 mm single-hole sieve tray in the hot water tower. The pictures were processed by image processing software to obtain the characteristics of the bubble. In the experiment, non-condensable gas was added to the steam as a carrier of particles. A mixture of gaseous N2 and N2/solid particles was used to study the effect of solid particles on bubble formation, collapse and motion processes. The correlation for the number of transfer units NTUL is proposed. The experimental results show that the entire growth cycle of the bubble includes the formation region, the rising region and the oscillation region. The ratio of bubble length to diameter decreases from 1.13 to 0.80 in the formation region and surges to 1.3 in the rising region. The equivalent radius of the bubble increases throughout the entire cycle of motion, with the highest growth rate in the formation region and maximum radius of bubble not exceeding 20 mm. The centroid velocity rate of bubble in the formation region shows an increasing trend, and then fluctuates around 0.4 m/s in the rising region and the oscillation region. When N2 was entrained into the pulverized coal particles, it was found that the proportion of the rising region of the bubble was greatly reduced, and the proportion of the oscillation region increased significantly, which was conducive to the transfer of heat within the tower. The effect is more obvious when steam and nitrogen ratio α is less than 10.

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Abbreviations

R :

Equivalent radius of bubble, mm

S :

Area of bubble, mm2

t :

Time, ms

Uy :

Centroid velocity of bubble, m·s−1

α :

Steam and nitrogen mass flow ratio

L :

Flow rate of liquid, L·h−1

G:

Flow rate of steam, kg·h−1

t cond :

Steam condensation temperature, °C

NTU :

Number of transfer units

ρ :

Density, kg·m−3

F P :

kinetic energy parameter

L :

Liquid

G:

Gas

in:

inlet

out:

outlet

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Acknowledgements

This work was supported by Ministry of science and technology of the People’s Republic of China, and under the Research Fund (2017YFB0602802).

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  1. East China University of Science and Technology, Shanghai, 200237, China

    Zebin Bao, Yifei Wang, Chenhui Hu & Guangsuo Yu

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  1. Zebin Bao
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  2. Yifei Wang
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  3. Chenhui Hu
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  4. Guangsuo Yu
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Correspondence to Yifei Wang.

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Bao, Z., Wang, Y., Hu, C. et al. Effect of solid particles in evaporating hot water tower on bubble movement. Heat Mass Transfer 56, 2445–2456 (2020). https://doi.org/10.1007/s00231-020-02869-y

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