Biomedical Engineering and Bioengineering Commons^™

Effect Of Screw Configuration And Speed On Rtd And Expansion Of Rice Extrudate, Siew-Yoong Lee, Kathryn L. Mccarthy

Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research

The influence of screw configuration and screw speed on the residence time distribution and product expansion was determined for rice meal processed in a corotating twin screw extruder. Screw speed had strong effect on the E(t)- and F(t)-diagrams, with the mean residence time varying inversely with screw speed from 206 s to 256 s. the F-diagram was modeled by the combination of perfect mixing and plug flow. the P estimates, which express the fraction of material in plug flow, varied inversely with screw speed from 0.41 to 0.55 for the operating conditions in this study. Both screw configuration and screw …