Measurement of density and specific weight of suspensions, boiling layers, liquids and gases in ascending flow
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A method has been devised for the direct and continuous measurement of density and specific weight of suspensions and in general of suspensions, including boiling layers of small particles, as well as of liquids and gases, in an ascending flow, the speed of which may be variable (applicable also in the absence of an ascending flow).
The essence of the method is the submersion in the investigated medium of two specially shaped bodies suspended on opposite arms of the balance (or some other measuring device), these bodies having the same true weight and equal aerohydrodynamic resistance, but different volumes. In this case the balance measures the weight of a volume of medium equal to the difference in volumes of the submerged bodies, and when suitably calibrated directly registers the specific weight or bulk density of the medium (the scale of the instrument is graduated in units of specific weight or density for any difference in volume of the bodies).
The bodies may have various special shapes which ensure the equality of their aerohydrodynamic resistances. The employment of bodies of shapes which satisfy the equal resistance condition is essential, since this makes it possible to conduct measurements in an ascending flow.
We determined the shapes of bodies of different volumes, which satisfied the requirement of equal resistance in practical conditions of measurement, and which ensured the equality of the aerohydrodynamic forces acting on these bodies in an ascending flow at any practical rate. Double cones are most suitable in practice.
The difference in volumes, the volumes themselves, and the masses of the bodies may be altered to suit the purpose of the instrument and the corresponding measurement conditions.
In the case of strong eddy motions we must use bodies of large mass, which ensures their stability, and the difference in volumes must also be sufficiently large.
KeywordsPhysical Chemistry Analytical Chemistry Small Particle Bulk Density Measurement Condition
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