Experimental Study on Onset of Boiling in Rectangular Narrow Channel with Large Aspect Ratio

Cao Chengque; Kuang Bo; Zhao Yu; Deng Jian; Ding Shuhua; Wu Dan

doi:10.13832/j.jnpe.2023.01.0024

Volume 44 Issue 1

Feb. 2023

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Cao Chengque, Kuang Bo, Zhao Yu, Deng Jian, Ding Shuhua, Wu Dan. Experimental Study on Onset of Boiling in Rectangular Narrow Channel with Large Aspect Ratio[J]. Nuclear Power Engineering, 2023, 44(1): 24-31. doi: 10.13832/j.jnpe.2023.01.0024

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Cao Chengque, Kuang Bo, Zhao Yu, Deng Jian, Ding Shuhua, Wu Dan. Experimental Study on Onset of Boiling in Rectangular Narrow Channel with Large Aspect Ratio[J]. Nuclear Power Engineering, 2023, 44(1): 24-31. doi: 10.13832/j.jnpe.2023.01.0024

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Experimental Study on Onset of Boiling in Rectangular Narrow Channel with Large Aspect Ratio

doi: 10.13832/j.jnpe.2023.01.0024

1.
Shanghai Jiao Tong University, Shanghai, 200240, China
2.
Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2022-03-13
Rev Recd Date: 2022-05-21
Publish Date: 2023-02-15

Abstract

Abstract

The prediction of onset of nucleate boiling (ONB) in rectangular narrow channel is very important for reactor safety design. For the vertical narrow rectangular channel with the channel size of $50\;\mathrm{ }\mathrm{m}\mathrm{m}\times 3\;\mathrm{ }\mathrm{m}\mathrm{m}\times 1000\;\mathrm{m}\mathrm{m}$, using deionized water as the medium, the position of ONB is confirmed by monitoring the change of wall temperature. The effects of heat flux, mass flow rate, pressure and inlet subcooling on ONB location and wall superheat are studied. Eight existing ONB prediction models are collected and evaluated, and the conclusions are obtained by analyzing the experimental data: The ONB prediction model based on pool boiling and its improved model can not be well applied to rectangular narrow channels, especially for the impact of mass flow rate. Some models developed for prediction of ONB in rectangular channels can reflect the development trend of wall superheat of ONB points with different parameters to a certain extent. However, because the range of experimental parameters is not wide enough, the scope of application and prediction accuracy are still limited. Combined with the main factors affecting the occurrence of ONB in narrow rectangular channels, the analytical solution form suitable for calculating the wall superheat of ONB points in narrow rectangular channels under the conditions of wide spectrum parameters is derived, and the fitting is carried out using experimental data. The deviation between the predicted results of more than 95% of the new relationship and the experimental results is less than ±20%. At the same time, the prediction of ONB data from other relevant published literatures by the new relationship is still in a good error range.
- Rectangular narrow channel,
- Onset of nucleate boiling (ONB),
- Prediction model

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References(26)

References

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