FREE & FORCED VORTEX APPARATUS

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Description

The free vortex experimental set up consist of a circulartransparent cylindrical tank fabricated with stainless steelat bottom. Near the bottom of the tank, fourcircumferential jets are placed along the circumference ofthe cylinder. These circumferential jets, near its bottom,helps in the formation of free vortex. It is assumed thatthe torque exerted by these jets is negligible. Threedifferent interchangeable openings are provided whichcan easily be fixed at the bottom. A pointer can betransverse horizontally & vertically across full diameter ofthe vessel so that water surface profile can be measure.Both axes contain graduations so that exact position ofthe pointer is known. The experimental procedureinvolves measurement of the resulting free surface thatrepresents the variation of the sum of the pressure headand datum head. An arrangement is provided to drain thevessel.The forced experimental set-up consist of a circulartransparent cylindrical tank, fixed on a stainless steelplate. This plate is rotated with the help of a variablespeed motor so that the cylinder rotates about its verticalaxis. The motor is supplied with speed control facility androtation of the transparent tank is displayed on a Digital RPM Indicator. Water is filled in this tank up to certainlevel. When this water filled transparent tank rotates, aforced vortex is formed. An upper probe can betransverse horizontally & vertically across full diameter ofthe transparent tank so that water surface profile can bemeasure. Both axes contain graduations so that exactposition of the probe is known. The experimentalprocedure involves measurement of the resulting freesurface that represents the variation of the sum of thepressure head and datum head. An arrangement isprovided to drain the vessel.