## 2 Model and Experimental Research
### Dust Settler Segment Experimental Tests of Air Filter Multicyclone  
#### 2.4.1 Purpose and Subject of Flow Tests in Dust Settler  
The aim of the experimental flow tests was to evaluate the proposed changes concept in the internal structure of the air filter multi-cyclone MT dust settling tank segment due to the improvement in uniformity of suction from the individual cyclones, which should positively affect the separation efficiency of the entire multi-cyclone. \begin{table}
\begin{tabular}{c c c} \hline
**Parameter Name** & **Value** \\ \hline Air flow leaving the multi-cyclone & \(Q_{G}=3400\) m\({}^{3}\)/h, \\ Air density & \(\rho=1.29\) kg/m\({}^{3}\) \\ Kinematic air viscosity & \(\
u=1.7\times 10^{-5}\) m\({}^{2}\)/s \\ \hline Multicyclone & Number of cyclones in a multi-cyclone & \(i_{cm}=96\) \\ Suction degree & \(m_{0}=8\%\) \\ \hline Segment width & \(a=0.095\) m, \\ Settling tank height at the outlet & \(h=0.057\) m \\ Diameter of cyclone discharge opening & \(d_{e}=0.019\) m \\ \hline Number of cyclones assigned & No. 1 & \(i_{c1}=6\) \\ to the channels & No. 2 & \(i_{c2}=6\) \\ No. 3 & \(i_{c3}=9\) \\ \hline Number of established channels & \(k=3\) \\ \hline Exhaust duct length & No. 1 & \(l_{2}=0.024\) m \\ No. 2 & \(l_{2}=0.096\) m \\ No. 3 & \(l_{2}=0.192\) m \\ \hline Suction channel chamber & No. 1 & \(c_{2}=0.072\) m \\ length & No. 2 & \(c_{2}=0.096\) m \\ No. 3 & \(c_{2}=0.144\) m \\ \hline Suction channel wall roughness & \(K_{S}=0.5\times 10^{-8}\) m \\ \hline Calculation step and accuracy & Calculation step & \(h=1\) mm \\ Calculations accuracy & \(\delta=5\%\) \\ \hline \end{tabular}
\end{table} 
Table 1: Data for numerical calculations for the segment of the MT multi-cyclone dust settle. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Channel** & \begin{tabular}{c} **Air Velocity in** \\ **Exhaust Duct** \\ \end{tabular} & \begin{tabular}{c} **Reynolds** \\ **Number** \\ \end{tabular} & \multirow{2}{*}{**Local Pressure Loss \(\Delta p\) (Pa)**} & \begin{tabular}{c} **Total Pressure** \\ **Loss** \\ \end{tabular} & \
\begin{tabular}{c} **Calculations** \\ **Accuracy** \\ \end{tabular} &
\begin{tabular}{c} **Channel** \\ **Height** \\ \end{tabular} \\ \cline{2-10} **Number** & \(\
u_{ki}\) (m/s) & \(Re\) & \(\Delta p_{ei}\) & \(\Delta p_{wi}\) & \(\Delta p_{ki}\) & \(\Delta p_{Ksi}\) (Pa) & \(\delta\) (\%) & \(h\) (mm) \\ \hline
1 & 5.96 & 6679 & 3.445 & 0 & 1.256 & 4.701 & \(\delta_{1-2}=4.46\) & 12 \\ \hline
2 & 2.65 & 6088 & 3.731 & 0.697 & 0.483 & 4.911 & \(\delta_{2-3}=0.386\) & 19 \\ \hline
3 & 2.27 & 8158 & 3.731 & 0.753 & 0.408 & 4.892 & \(\delta_{1-3}=4.06\) & 26 \\ \hline \end{tabular}
\end{table} 
Table 2: Numerical calculations results for dust settling tank segment in multi-cyclone MT. Research subject was dust settler segment of the MT multi-cyclone air filters built on the basis of the model test results of the dust settler. A schematic structure diagram of the MT multi-cyclone composed of the segments is shown in Figure 13.  
In the inertial filters, made of several dozen cyclones, it is possible to use various methods for organizing the ejection suction. The choice of a specific method and the method used, aimed at ensuring the suction streams have the same values for all individual cyclones, depends not only on their efficiency, but also on the form of the multi-cyclone, number of cyclones and dust separator configuration, space limitations in the place of its installation, and the possibility of carrying out an appropriate research range. The uniform value of the suction streams from the individual cyclones can be ensured by using the equal resistances method of suction streams through appropriate structural changes to the multi-cyclone dust settler, which consists of dividing the settling space into independent segments and channels covering a specific number of cyclones.