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Partic. vol. 34 pp. 126-133 (October 2017)
doi: 10.1016/j.partic.2017.03.003

Correlation analysis of three influencing factors and the dust production rate for a free-falling particle stream

Mengjie Duana, Yi Wanga, *, Xiaofen Renb, Xinrui Qua, Yingxue Caoa, Yang Yanga, Lun Nianc

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    • Effects of three factors on dust emission from a free-falling particle stream were studied. • First and second fugitive dust emission rates were measured under various conditions. • Correlations of fugitive dust emission rate with the influencing factors were presented.


The effects of three factors (i.e., drop height h, hopper outlet diameter d0, and material temperature T) on the dust generation rate derived from a free falling particle stream were investigated via full factorial experiments. The correlation between the three factors and dust generation rate was also analysed. Results show that T and h affect the first fugitive dust rate largely, whereas the second fugitive dust rate is mainly dominated by h and d0. Through analysing the first fugitive dust percentage data, it is found that h and T should be considered first for higher temperatures and lower flow rates, whereas h and d0 can be considered under contrasting conditions, and h should be controlled in the remaining two sets of conditions. Relationships between the influencing factors and total and first fugitive dust rates were developed via multiple regression to quantify the dust emission rates for different contact surfaces (rigid or water).

Graphical abstract


Particle stream; Free falling; Multiple factors; Correlation; Regression analysis