Flow change of material in the material seal pump pipeline of powder pneumatic conveyor equipment.
The change of material flow in the powder pneumatic conveying material seal pump pipeline is always random. If turbulence is described in terms of instantaneous velocity and instantaneous pressure, the problem is too complex to be determined. However, using the concept of statistical averaging in molecular dynamics theory to study turbulent flow can avoid complex and variable pulse motions and simplify them to a stable flow with constant boundaries, so that the calculation of drag is accurate enough.
However, we must be conceptually clear that the turbulent movement of the material conveyed by the material seal pump of the powder pneumatic conveying equipment is an unstable flow that is affected by the pulsating motion. Therefore, when describing turbulent motion with time-averaged velocity, the viscous shear stress of the fluid should be calculated in addition to Newton's law of internal friction, and the additional shear stress should be considered on the surface of the wave. Velocity. Due to the violent development of pulsed motion in turbulence, the additional shear stress in turbulence is much greater than the viscous shear stress, which is the physical reason for the large turbulent resistance of the powder pneumatic conveying material seal pump is greater than that of laminar flow.