Page 37 - Annual Report_21-22

Radial distribution of dimensionless concentration in the tube side of the fiber for pH=3, [Cyanex 272]=200 mol/m ,
3
organic flow rate= m /s, aqueous flow rate=9m /s (a) Nd , (b) La , (c) Y +3
3
+3
+3
3
Experimental Deduction of the Granular Velocity Field by using Particle Image Velocimetry (PIV)
Granular flows are prominently encountered in the mining ameliorating hopper discharge (Figure 1.1).
industries. Design of the handling equipment to store and The experimental apparatus has been constructed
transport the fine powder requires the knowledge of for the high-resolution photography. Initially, only flat
powder flowability. The flowability of the granular material configuration hoppers would be tested for validation
has been investigated by using granular particle image purpose and tuning the code. Eventually, other conical
velocimetry technique in which granular particles acts as configurations involving the detachable inserts would be
tracers. The experimental apparatus has been fabricated utilized to conduct a complete parametric study. Final
from the plexiglass material. Particle size ranging from target is to test silica sand for its discharge characteristics
1-1.5 mm have been tested for the validation studies. The from the flat bed hopper. Cross correlation between
image analysis has been carried out in MATLAB to deduce the corresponding images has been utilized to estimate
the corresponding cross-correlation function between the the direction and the magnitude of the velocity field
images. The objective of the study is to design an insert for developed inside the hopper during its discharge.

Figure 1.1: (a) Experimental apparatus, 1) 2D Plexiglas hopper, 2) Insert, 3) high speed camera and 4) computer and (b)
cohesionless particles (d = 1 mm) discharging from flat rectangular hopper with opening size d = 8 x 8 mm and w = 120 mm.
2
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ANNUAL REPORT 2021-22 35