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Experimental investigation on flash evaporation of water at different water depths with functional analysis method

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Abstract

It is important to study the temperature stratification phenomenon in flash evaporation to well design the marine accumulator and some related industrial equipment. Therefore, a series of flash evaporation experiments with initial temperature of 65.0 °C ~ 84.4 °C and superheat degree of 5.0 °C ~ 30.0 °C are carried out to study the temperature variations at different water depths. Meanwhile, the functional analysis method is used to obtain the global and local digital characteristic of flash evaporation. Also, the application domain of this method is discussed in detail. Finally, the effects of initial temperature and superheat degree on the variation of non-equilibrium fraction are studied by the functional analysis method. Results show that the temperature of the deeper water drops earlier and faster than that of the shallower water, and the temperature stratification phenomenon is obvious at the beginning 20s of flash evaporation. This phenomenon gradually disappears as the flash evaporation proceeds. Increasing the initial temperature effectively accelerates the drop of water temperature. However, due to the large temperature decline, increasing the degree of superheat only increases the decreasing rate of temperature, but does not significantly reduce the duration time of flash evaporation.

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Abbreviations

H :

water height [m].

T :

temperature [°C].

NEF :

Non-equilibrium fraction.

t :

time [s].

I :

integration.

s :

sample standard deviation.

CV:

coefficient of variation.

x :

observed values of sample.

N :

sample size.

ΔT :

superheat degree [°C].

\( \overline{x} \) :

the average of observed value.

0:

start of flash.

e :

equilibrium.

i, j :

time step.

avg :

average value.

n :

number of experiments.

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Acknowledgements

The authors thank two anonymous reviewers for their helpful comments on the earlier draft of this paper. This work was financially supported by the Fundamental Research Funds for the Central Universities (No. 3072020CFT303) and the program of China Scholarship Council (No. 201906680009).

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Authors and Affiliations

  1. College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China

    Siguang Li, Yanjun Li & Longbin Yang

  2. College of Intelligent Manufacturing, Qingdao Huanghai University, Qingdao, 266427, China

    Lili Liu

  3. China General Nuclear Power Group, Shenzhen, 518000, China

    Xiaojin Zhang

  4. College of Mathematical Sciences, Harbin Engineering University, Harbin, 150001, China

    Runzhang Xu

Authors
  1. Siguang Li
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  2. Yanjun Li
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  3. Lili Liu
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  4. Longbin Yang
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  5. Xiaojin Zhang
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Contributions

Yanjun Li is fully responsible for the planning of research, the construction of test benches, and the design of experiments. Longbin Yang completed the design of the experimental platform and conducted the experiment, and is also the general person in charge of the entire research. Siguang Li and Xiaojin Zhang were the main executors of the experiment and completed the data collection and preliminary collation. Xiaojin Zhang completed the first draft of the research, Lili Liu participated in the writing of the paper, and Siguang Li rewritten the paper and conducted a more in-depth analysis of the data. Runzhang Xu proposed the basic technology and ideas of data processing, reviewed the research framework and main conclusions, and revised the final version.

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Correspondence to Longbin Yang.

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Li, S., Li, Y., Liu, L. et al. Experimental investigation on flash evaporation of water at different water depths with functional analysis method. Heat Mass Transfer (2020). https://doi.org/10.1007/s00231-020-02996-6

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  • DOI: https://doi.org/10.1007/s00231-020-02996-6

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