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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2014, Volume 65, Issue 7,





Cosmin V. Jinescu
Performance Enhancement of Machines with Helical Elements

Abstract:

A number of machines with helical active elements used in the process industries are analyzed: helix and turbine impellers with draft tubes; screw of a single screw extruder and helical flight feeders. These have in common the helical shape and functioning with a fully filled section with transported liquid or material. Based on the analysis of the movement of the liquid or granular material determined by the helical surface, the following relationships are established: pumping flow rate for helix impellers; transport flow rate of an extruder screw and of a screw conveyor functioning with a fully filled section with material. The relationships evidenced the importance of a correct choice for the inclination angle of the helical flight and the influence of friction between liquid or granular material and the helical surface. Keywords: output; screw machines; impeller; helical elements; friction coefficient


Issue: 2014, Volume 65, Issue 7
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