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Model experiments on sliding friction for application in hydraulic conveying of solids
Author(s) -
Briscoe B. J.,
Radwan H.,
Streat M.
Publication year - 1983
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450610601
Subject(s) - work (physics) , mechanics , particle (ecology) , flow (mathematics) , geotechnical engineering , materials science , friction coefficient , particle velocity , geology , thermodynamics , physics , composite material , oceanography
This paper describes a preliminary experimental study of the sliding friction of sand‐water mixtures when continuously propelled over glass surfaces by a potential energy gradient. The particle contact density at the glass wall and the work dissipated are estimated. These experiments are compared with the process of hydraulic conveying of sand‐water mixtures under a hydraulic gradient. It is argued that there is a unique correlation between the surface particle density and the frictional work irrespective of the nature of the driving force. This argument allows a realistic estimate of the frictional work in hydraulic conveying to be made from the measurement of surface particle velocity during flow. In an example cited, the dynamic coefficient of sliding fraction for a particular case of sand‐water flow is found to be a function of mean velocity and decreases from about 0.65 to 0.22 for velocities of 0.47 and 1.07 m/s respectively.