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Friction modification in a coupled system
Author(s) -
Peters L. K.,
Bender D. W.,
Klinzing G. E.
Publication year - 1974
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690200405
Subject(s) - drag , silastic , turbulence , mechanics , tube (container) , glass tube , flow (mathematics) , reduction (mathematics) , parasitic drag , volumetric flow rate , materials science , chemistry , phase (matter) , thermodynamics , composite material , physics , geometry , mathematics , organic chemistry , medicine , endocrinology
Two‐phase solids‐in‐air flow was experimentally studied in a once through flexible wall tube flow system using nominal 25μm and 50μm spherical glass beads. For turbulent flow through the Silastic tube without a damping medium behind the wall, cases of true drag reduction and no drag reduction were found. The rate of addition of the glass beads was seen to be a correlatable parameter for both the flexible and rigid wall systems. A mechanistic model is proposed for interpretation of the results. It was qualitatively observed that the presence of an electrostatic charge on the particles at low relative humidities had a pronounced effect on increasing the drag in the system.