CFD Analysis on Extrusion of Slurry in Direct Ink Writing
67
Fig. 7 Local pressure contour at viscosity of 180 Pa s
that, there is high pressure at inlet region of nozzle and uniform pressure across other
sections of extruder is experienced.
2.4 Case(iii): Effect of Varying the Mass Flow Rate
The mass flow rate has been diversified from 0.033 to 0.0611 kg/h (for the inlet
velocity 0.001–0.003 m/s) and at 25 rpm, CFD analysis is performed. The increase
of mass flow rate resulted in increase of pressure as shown in Fig. 9. Due to flow
conditions at the top of screw, more pressure is generated as seen from Fig. 10 and
it is decreased gradually across the screw region (Figs. 8 and 11).
3 Analytical Approach
3.1 Shear Rate
The shear rate of the extruder screw channel is calculated using the following relation,
γ (Screw channel) =
π × D × N
h
(1)
67
Fig. 7 Local pressure contour at viscosity of 180 Pa s
that, there is high pressure at inlet region of nozzle and uniform pressure across other
sections of extruder is experienced.
2.4 Case(iii): Effect of Varying the Mass Flow Rate
The mass flow rate has been diversified from 0.033 to 0.0611 kg/h (for the inlet
velocity 0.001–0.003 m/s) and at 25 rpm, CFD analysis is performed. The increase
of mass flow rate resulted in increase of pressure as shown in Fig. 9. Due to flow
conditions at the top of screw, more pressure is generated as seen from Fig. 10 and
it is decreased gradually across the screw region (Figs. 8 and 11).
3 Analytical Approach
3.1 Shear Rate
The shear rate of the extruder screw channel is calculated using the following relation,
γ (Screw channel) =
π × D × N
h
(1)