Study on the flow field characteristics of bulk grain pipeline based on gas-solid heterogeneous coupling

Figures & data

Figure 1. Three-axis dimensions of wheat.

Figure 2. Triaxial normal distribution of wheat.

Table 1. Results of statistical analysis of wheat

parameter	crest value	least value	mean	standard deviation
macroaxis (mm)	7.62	4.02	6.20	0.37
axis (mm)	4.00	2.36	3.10	0.30
minor axis (mm)	3.72	2.38	2.90	0.22

Figure 3. Schematic diagram of the pneumatic cyclone transmission experimental system of the bulk grain pipeline.

Figure 4. Cyclone simulation pipeline.

Figure 5. Spinning devices of different sizes.

Table 2. Simulation and simulation parameters

	project	detailed information	metric	numeric value
CFD	material	Fluid (air)	density [kg/m^3]	1.225
			Viscosity [kg/ms]	1.7894E–5
		Solid state (stainless steel)	density [kg/m^3]	7800
	boundary condition	Speed entrance	Speed size [m/s]	20
		swift current	turbulent intensity	5%
			Hydraulic Diameter [mm]	100
		Pressure export	pressure	0
		Wall surface	Wall motion	Static wall surface
			Cut state	No slip
			harshness [mm]	0.0015
			Roughness constant	0.5
		time step	Fixed time step [s]	1E–3
DEM	material	Grain particles	Poisson ratio	0.29
			Shear modulus [Pa]	5E+8
			Density of [kg/m^3]	1350
		Wall surface	Poisson ratio	0.3
			Shear modulus [Pa]	7 E+10
			density [kg/m^3]	7800
	touch	Particle-particle	recovery coefficient	0.5
			static friction coefficient	0.58
			coefficient of rolling friction	0.08
			Interactive contact model	Hertz-Mindlin (no slip)
		Particle-Wall	recovery coefficient	0.5
			static friction coefficient	0.61
			coefficient of rolling friction	0.05
			Interactive contact model	Hertz-Mindlin(no slip)
	Granular factory	Grain particles	Particle-equivalent diameter [mm]	4
			Factory type	Dynamic/unlimited number
			Mass flow rate [kg/s]	0.634
	emulator	time step	Fixed time step [s]	1E–5
		network analogue	Mesh size [mm]	10

Figure 6. Axial velocity of tracheal filling number 3–7 at different angles.

Figure 6. (Continued).

Figure 7. Tangential velocity of tracheal filling number 3–7 under different angles.

Figure 7. (Continued).

Figure 8. Tracks of flow field movement at number of side trachea at t = 1s.

Figure 9. Static pressure at the measurement point.

Figure 10. Static pressure drop of different device.

Figure 11. Polyphase flow trace diagram at different angles.

Figure 12. 3D Printing a starting device with different angles.

Figure 13. Experimental setup Fig.

Figure 14. Test results of different clip angles.