Effects of screw speed and feed rate on residence time distribution and axial mixing of wheat flour in a twin-screw extruder
1992
Yen, A.I. | Hwang, S.J. | Guo, J.J.
The residence time distribution of wheat flour with a moisture content of 40% in a twin-screw extruder was determined using erythrosin as the tracer. Both feed rate and screw speed affected the mean residence time and flow pattern in the extruder. Increasing the feed rate or screw speed reduced the mean residence time. The effect of feed rate was more pronounced than that of screw speed. The dispersion number, a reciprocal of the Peclet number, was used to describe the extent of axial mixing in the extruder. The value of dispersion number varied from 0.017 92 to 0.061 94. There existed a good correlation between the dispersion number and the ratio of feed rate to screw speed.
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