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Local residence time, residence revolution, and residence volume distributions in twin‐screw extruders
Author(s) -
Zhang XianMing,
Feng LianFang,
Hoppe Sandrine,
Hu GuoHua
Publication year - 2008
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20812
Subject(s) - residence time distribution , extrusion , residence time (fluid dynamics) , mixing (physics) , residence , plastics extrusion , materials science , block (permutation group theory) , throughput , volume (thermodynamics) , mechanical engineering , mechanics , computer science , mathematics , composite material , thermodynamics , geometry , physics , engineering , demography , telecommunications , flow (mathematics) , geotechnical engineering , quantum mechanics , sociology , wireless
Abstract This work was aimed at studying the overall, partial, and local residence time distributions (RTD); overall, partial and local residence revolution distributions (RRD) and overall, partial and local residence volume distributions (RVD) in a co‐rotating twin screw extruder, on the one hand; and establishing the relationships among them, on the other hand. Emphasis was placed on the effects of the type and geometry of mixing elements (a gear block and various types of kneading elements differing in staggering angle) and process parameters on the RTD, RRD and RVD. The overall and partial RTD were directly measured in‐line during the extrusion process and the local ones were calculated by deconvolution based on a statistical theory. The local RTD allowed comparing the mixing performance of mixing elements. Also it was confirmed both experimentally and theoretically that specific throughput, defined as a ratio of throughput ( Q ) over screw speed ( N ), controlled all the above three types of residence distributions, be they local, partial or overall. The RRD and RVD do not provide more information on an extrusion process than the corresponding RTD. Rather they are different ways of representing the same phenomena. POLYM. ENG. SCI., 48:19–28, 2008. © 2007 Society of Plastics Engineers