Abstract
The rise of an unsupported liquid column through the air from a quiescent pool to a capillary with suction (the “ductless siphon”) is interpreted approximately in terms of the elongational viscosity (η̄) of several solvents and dilute polymer solutions. The maximum height of siphon rise (h*) is used to characterize the ratio η̄/η, where η is shear viscosity, and an approximate hydrodynamic analysis shows η̄/η∼(h*)2. Measurements made for polyisobutylenes in toluene and jet fuel (kerosene), for a proprietary antimisting agent PX in jet fuel, and for polyethylene oxide and polyacrylamides in water show that h* depends on molecular variables as predicted by dilute‐solution theories for η̄/η. Polymer molecular weight range is 0.8×106<M̄v<7.4×106 and concentration range is 0<c<3000 wppm. A major application for this simple apparatus is seen for quality control, field testing, and rapid candidate screening of polymer systems whose properties depend sensitively on the highest‐M fraction of the molecular weight distribution.
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