Abstract
The aim of this study is to model screw feeder unit to handle granulated wet cassava to the flash dryer column. The knowledge of the flow behavior, physical and mechanical properties, rheology of the product and the geometrical characteristics of feeders unit were essential to evaluate the best conditions of handling granulated cassava based on the theory of virtual works. The effect of granular media strain on the rotational speed which is limited to 2 rps corresponding to the elastic limit of 30% was studied. With the same strain limit, maximum screw length of 1300 mm and the maximum residence time of 100 s in the bin were identified as the best area used to design the screw feeder unit and conduct the process operation. The modeling of the strain was based on the theory of virtual works or energies. Key words: Modeling, virtual works, strain, screw feeder, cassava.
Highlights
The screw feeder is one of the most useful feeding devices which has good metering characteristics, and uses relatively simple components and can be designed to feed many kinds of bulk solids, reliably in a variety of applications
Rheology is the study of the behavior of material when subjected to stress or strength
The tests included the effect on the performance of a screw feeder, of the pitch, the radial clearance between the screw flight and trough, the hopper exposure and the head of the bulk solid contained in a hopper
Summary
The screw feeder is one of the most useful feeding devices which has good metering characteristics, and uses relatively simple components and can be designed to feed many kinds of bulk solids, reliably in a variety of applications. Those materials can be chemical, agricultural, pharmaceutical and mineral. The tests included the effect on the performance of a screw feeder, of the pitch, the radial clearance between the screw flight and trough, the hopper exposure and the head of the bulk solid contained in a hopper.
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