Sedimentation: A comparison between theory and experiment

✍ Scribed by J.R. Blake; P.M. Colombera

• Publisher: Elsevier Science
• Year: 1977
• Tongue: English
• Weight: 768 KB
• Volume: 32
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(77)80108-5

✦ Synopsis

A senn-empulcal approach usmg Darcy's law for flow III a porous medium IS apphed to the problem of a sedunentmg column of particles Application of the mass contmmty equations for the moisture ratto, 8, leads to a non-lmear Fokker-Planck equation with non-hnear boundary conditions m the material coordinate system The governmg equations and boundary conditions are smtably hneansed to predict volume outflows (or volume of clear liquid at the top), and concentration and eqmhbrmm profiles Experunents were carried out on two columns of different length to record both the volume concentration profiles of particles and votume outflow The particle concentrations were obtamed by a y-ray attenuation method TheoretIcal and experunental determmahons of volume outflows agree well, and for early times the profiles for the volume concentration as a function of height are snndar However, near eqmhbnum the two profiles do not compare so favourably, this bemg ambuted to the hrmtations of the hnear analysis at tlus stage of the sedunentation process 1 lNTRODUCTION