A conductimetric method for the study of mixing phenomena in liquids

✍ Scribed by J.F. Brodberger; G. Valentin; A. Storck

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 656 KB
• Volume: 28
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(83)85054-3

✦ Synopsis

A new conductimetric microprobe and conductimeter have been designed to study mixing phenomena in fluids of non-uniform composition in turbulent flow. For the case of a parallelepipedic cell with two parallel jets at dimerent salt tracer concentrations, the spatial distribution and themean and variance of the fluctuations of the tracer are obtained experimentally and used to characterise the state of local mixing. A theoretical expression for the mean concentration is obtained by solving the convective diffusion equation. Comparison of experimental and theoretical results is satisfactory and proves to be a sufficiently good test of the reliability of the apparatus used. NOMENCLATURE C Instantaneous value of salt concentration C, Mean concentration in salt water c2 Mean concentration in water c' Fluctuation in concentration D Molecular diffusivity D, Turbulent diffusion coefficient Ii Cell constant L Half-width of channel M Mesh size of the grid n Constant o(C) Probabilitv density