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).

通过全因子实验研究了三个因素（降落高度h，料斗出口直径d ₀和物料温度T）对自由下落的颗粒流产生的粉尘产生率的影响。还分析了这三个因素与粉尘产生率之间的相关性。结果表明，T和h对第一扬尘率有较大影响，而第二扬尘率主要由h和d _0决定。通过分析第一个扬尘百分比数据，发现h和T对于较高的温度和较低的流量，应首先考虑h，而在对比条件下可以考虑h和d ₀，在其余两组条件下应控制h。通过多重回归建立了影响因素与总扬尘率和首次扬尘率之间的关系，以量化不同接触表面（刚性或水）的扬尘率。