## 3 Results and Discussion
### FMT Validation  
Table 6 displays the measured weights of the crushed millet in the FMT. Figure 21 illustrates the particle distribution over the perforated plate and Table 7 gives the corresponding statistical indices. According to Figure 21a, when no additional deflector exists, it indicates that the crushed millet accumulates in the central area of the plane. The corresponding maximum percentage of the \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Case**} & \multicolumn{8}{c}{**Position of the Detection Holes**} \\ \cline{2-9}  & **A** & **B** & **C** & **D** & **E** & **F** & **G** & **H** & **I** \\ \hline No deflector & 8.1939 & 6.2764 & 3.6915 & 16.0562 & 33.2517 & 16.5015 & 7.5442 & 7.3632 & 14.7715 \\ \begin{tabular}{c} Low deflector \\ installation \\ \end{tabular} & 6.3363 & 6.7788 & 3.1165 & 11.9148 & 10.3647 & 4.2281 & 9.2913 & 6.9905 & 8.6209 \\ \
\begin{tabular}{c} Middle deflector \\ installation \\ \end{tabular} & 5.1246 & 4.3803 & 2.3775 & 15.3987 & 11.1882 & 9.4037 & 7.1723 & 3.6794 & 9.6139 \\
\begin{tabular}{c} High deflector \\ installation \\ \end{tabular} & 8.2276 & 5.7866 & 5.0182 & 28.6073 & 2.4682 & 14.2543 & 13.4807 & 7.9573 & 15.9467 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Measured weights of the crushed millet in the FMT (unit: g). \begin{table}
\begin{tabular}{c c c} \hline \hline
**Case** & **RSD** & **Maximum Percentage** \\ \hline No deflector installed & 68.12\% & 28.51\% \\ Low deflector installation & 36.36\% & 16.87\% \\ Middle deflector installation & 50.94\% & 21.00\% \\ High deflector installation & 69.10\% & 27.84\% \\ \hline \hline \end{tabular}
\end{table} 
Table 7: The RSDs and the maximum percentages of the crushed millet’s weight over the perforated plate with different installing positions of the triangular deflector. Figure 21: The distributions of crushed millet over the perforated plate with different installing positions of the triangular deflector: (**a**) no deflector installed, (**b**) the low deflector installation, (**c**) the middle deflector installation, and (**d**) the high deflector installation. accumulation is 28.51%. Nonetheless, after installing the triangular deflector, it is easy to find that all the distributions have moved towards the left side of the plane. Although no evident improvement of uniformity is achieved by the high deflector installation, the accumulation is dispersed noticeably for the low deflector installation. The maximum percentage of the accumulated millet with the low deflector installation is 16.87% and the RSD is 36.36%, demonstrating that the low deflector installation is effective in reducing the accumulation during the FMT. Compared with the blue lines and magenta lines in Figure 18, the experimental results show a similar tendency on the distributions of the large-sized and extra-large-sized particles, which are classified as the particles larger than \(8.8\times 10^{-2}\) mm. In other words, the effects of different deflector installations on dispersing the particles are in accordance with the simulation results of the particles larger than \(8.8\times 10^{-2}\) mm. It can be observed that the maximum spots occurred at different positions on the coordinate to some extent. Generally speaking, the experimental results have a deviation towards the right side and a slight accumulation near the left-side wall. This may be attributed to the sampling process and the usage of the crushed millet. Measurement errors are caused by the collection through the detection holes. Besides, the crushed millet ranging from 0.22 mm to 0.45 mm contains more inertia, leading to the deviation to the right side. Some millet may be too heavy for the air to lift. Thus, accumulation occurs near the left-side wall after the crushed millet passes the turnings. Table 8 shows the measured values of air velocity for the FMT with the low deflector installation. According to Table 8, the RSD is 9.20% and the corresponding pressure loss is 489 Pa.