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Vol. 25 (1959) No. 160 P 1266-1273



This paper deals with the contraction of liquid jets under the actions of acceleration and surface tension force. At the beginning, the thickness of a jet discharged from a fixed nozzle is discussed, then with the results thus obtained for a guide, the formula for a jet from a rotating nozzle is derived : [numerical formula] where vn=discharge velocity, l=distance on the jet from the nozzle, D=thickness of the jet at the point of distance l, Dn=diameter of the nozzle, [numerical formula] (called Weber number, γ=specific weight of a liquid and σ=surface tension) and α=acceleration variable with l, but when l is small α becomes nearly equal to a centrifugal acceleration Rω2. All of the physical properties of a liquid are included in We as shown above, and when We exceeds the approximate value of 4, the effects of those properties on the thickness of a jet becomes negligibly small and the formula can be simplified as [numerical formula] The thickness of a jet discharged from a fixed nozzle can easily be obtained from these formulae, only replacing α with the acceleration of gravity g. All these formulae agree very well with the experimental results.

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