The influence of specific mechanical energy on cornmeal viscosity measured by an on-line system during twin-screw extrusion
| Autor: | Yoon Kil Chang, T. S. Park, F Martínez-Bustos, J .L. Kokini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1999 |
| Předmět: |
musculoskeletal diseases
Engineering drawing Materials science General Chemical Engineering Rheometer Mass flow Plastics extrusion lcsh:TP155-156 Specific mechanical energy slit die rheometer musculoskeletal system equipment and supplies cornmeal viscosity Viscosity surgical procedures operative Rheology Extrusion Reduced viscosity Composite material lcsh:Chemical engineering Twin-screw extruder specific mechanical energy |
| Zdroj: | Brazilian Journal of Chemical Engineering, Vol 16, Iss 3, Pp 285-295 (1999) Brazilian Journal of Chemical Engineering v.16 n.3 1999 Brazilian Journal of Chemical Engineering Associação Brasileira de Engenharia Química (ABEQ) instacron:ABEQ Brazilian Journal of Chemical Engineering, Volume: 16, Issue: 3, Pages: 285-295, Published: SEP 1999 |
| ISSN: | 1678-4383 0104-6632 |
| Popis: | The influence of specific mechanical energy (SME) on cornmeal viscosity during the twin-screw extrusion at feed moisture contents of 25 and 30% and screw speeds in the range from 100 to 500 rpm was measured. Cornmeal was extruded in a co-rotating, intermeshing twin-screw coupled to a slit die rheometer. One approach to the on-line rheological measurement is to use a slit die with the extruder. In the present work it was show that shear viscosity decreased as a function of SME. The viscosity of cornmeal at the exit die was influenced by screw speed, rate of total mass flow, mass temperature inside the extruder and SME. An increase in screw speed resulted in an increase in SME and a decrease in viscosity. A reduction in slit die height and an increase in screw speed and mass temperature led to a remarkable macromolecular degradation of the starch, as evidenced by the decrease in viscosity. |
| Databáze: | OpenAIRE |
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