Articles you may be interested inSimultaneous measurement of liquid density and viscosity using remote query magnetoelastic sensors Rev. Sci. Instrum. 71, 3822 (2000)The locus of a fine spherical particle in a slowly rotating column filled with liquid is investigated in detail with a fundamental equation of motion, and a method for measurements of viscosity 17 and density p' oftheliquid is proposed. With apartidehaving the radius a = 10--3 -1O-2 cmfrom the restriction Re S 1, (Re, Reynolds number) and the density pwithin l.Sp' Sp< 4p' in a column rotating at the angular velocity (Uo within 1.5 SAwolVo < 2, the particle locus becomes almost a circle with a diameter D that sensitively correlates with 1] and p' to be measured, where A = Ao -a (Ao, column radius) and Vo is the speed at free falL For one particle (a one-particle system), 1] is universally measurable for almost any kind ofliquid with a known p' 0 A two-particle system is also proposed for the continuous measurement of both 7] and p', and would be applied, for example, at varying temperatures or in the course of a chemical reaction.

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