Removal of deposited metal particles on a horizontal surface by vertical submerged impinging jets

IF 3.7 3区工程技术 Q2 ENGINEERING, CHEMICAL

Chinese Journal of Chemical Engineering Pub Date : 2025-07-01 DOI:10.1016/j.cjche.2025.02.017

Han Peng , Xinliang Jia , Xiaofang Guo , Yubo Jiang , Zhipeng Li , Zhengming Gao , J.J. Derksen

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Abstract

Jet agitation is known as a maintenance-free stirring technique for nuclear wastewater treatment and demonstrates great potential in transport of radioactive particles. Removal processes of horizontal sediment beds driven by impinging jets were experimentally investigated using image capture and processing technique. The beds were composed of heavy fine particles with particle density ranging from 3700 to 12600 kg·m⁻³ and particle diameter from 5 to 100 μm. The jet Reynolds number varied between 4300 and 9600. The single-phase large eddy simulation method was used for calculating both jet flow characteristics and wall shear stresses. The effects of jet strength, particle density, particle diameter, and bed thickness on bed mobility in terms of the critical Shields numbers were considered. Specifically, the critical Shields number was found to be intricately related to properties of particles, and independent of jet intensity. A new Shields number curve for stainless-steel particles was found, and a model was proposed to predict the transport rate of thin beds, with R² = 0.96.

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用垂直浸没的撞击射流去除水平表面上沉积的金属颗粒

射流搅拌是一种免维护的核废水处理搅拌技术，在放射性粒子的输送中显示出巨大的潜力。采用图像采集与处理技术，对冲击射流驱动下水平沉积物的去除过程进行了实验研究。床层由重细颗粒组成，颗粒密度为3700 ~ 12600 kg·m−3，粒径为5 ~ 100 μm。射流的雷诺数在4300到9600之间变化。采用单相大涡模拟方法计算了射流特性和壁面剪应力。从临界屏蔽数的角度考虑了射流强度、颗粒密度、颗粒直径和床层厚度对床层迁移率的影响。具体而言，发现临界屏蔽数与粒子的性质复杂相关，而与射流强度无关。建立了一种新的不锈钢颗粒的Shields数曲线，并建立了预测薄层输运率的模型，R2 = 0.96。

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来源期刊

Chinese Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

6.60

自引率

5.30%

发文量

4309

审稿时长

31 days

期刊介绍： The Chinese Journal of Chemical Engineering (Monthly, started in 1982) is the official journal of the Chemical Industry and Engineering Society of China and published by the Chemical Industry Press Co. Ltd. The aim of the journal is to develop the international exchange of scientific and technical information in the field of chemical engineering. It publishes original research papers that cover the major advancements and achievements in chemical engineering in China as well as some articles from overseas contributors. The topics of journal include chemical engineering, chemical technology, biochemical engineering, energy and environmental engineering and other relevant fields. Papers are published on the basis of their relevance to theoretical research, practical application or potential uses in the industry as Research Papers, Communications, Reviews and Perspectives. Prominent domestic and overseas chemical experts and scholars have been invited to form an International Advisory Board and the Editorial Committee. It enjoys recognition among Chinese academia and industry as a reliable source of information of what is going on in chemical engineering research, both domestic and abroad.