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ISSN Печать: 2152-5102
ISSN Онлайн: 2152-5110
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The Regime Hysteresis of Viscous Flow with Free Surface in Rotating Horizontal Cylinder
Краткое описание
The regime hysteresis of steady flow of liquid, which fills partially a steady-state rotating, horizontal cylinder is considered. The effect consists in exceeding the value of angular velocity of the cylinder in transition from circulating flow to wall layer flow, under the cylinder speed up over a value of its velocity in its reverse transition during deceleration. The hysteresis shows up when the Reynolds numbers are large, it is not observed when the numbers are small and it gains in strength when the degree of cylinder's filling with liquid increases. It is shown that the obtained analytical steady-state conditions of the wall layer are in agreement with experimental data for the case of large values of the Reynolds numbers, when disturbance of free surface arises, and they are not in agreement for the case of small values of the numbers, when circulating secondary flow springs up as a roller. On the basis of experimental data with allowance for accepted similarity criteria the universal diagrams are plotted which can be used in more exact calculations of the change boundary of regimes, are plotted.