Hydrocyclone Geometry

The hydrocyclone diameter is the main design variable, and affects both capacity and cut size. The broad operating range available for any hydrocyclone diameter is narrowed down by fixing the inlet and outlet dimensions. It is not generally possible to select independently all the design variables; however, there are reasonable ranges in relation to the hydrocyclone diameter, Dc. Figure 4 shows the approximate cut size and throughput range that can be achieved using cyclones of different diameters.

The cone angle for classification of hydrocyclones is 15-30°, with smaller angles for finer cut sizes, and larger angles for coarser cut sizes, respectively. The free vortex height is the distance between the bottom of the vortex finder and the spigot. Increasing hydrocyclone height improves both capacity and separation efficiency, and generally varies between 3 and 8 Dc.

The inlet opening is usually rectangular with a height to width ratio of 2 and an equivalent circular diameter of 0.14-0.33 Dc. The inner wall, outer wall or centre of the hydrocyclone inlet may be designed to be tangential to the cyclone body, and may also scroll downwards.

The outlet dimensions are the most important physical parameters used to alter the operation. Vortex finder diameters of 0.13-0.43 Dc are commonly used. Spigot diameters in the range 0.1-0.2 Dc are used, but the ratio to the vortex finder is more important. In general, the vortex finder diameter is greater than that of the spigot. Equal diameters should be avoided.

Solar Panel Basics

Solar Panel Basics

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