The relationship between the inlet and outlet of a hydrocyclone
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What is the relationship between the diameters of the inlet D1, the clear liquid return port D2, and the outlet D3 in a hydrocyclone? Is it D1 > D2 > D3?
It can be D1=D2>D3, or even D2>D1>D3
Does the outlet pipe D3 have to be smaller than the others?
Sure, of course. For more details, you can look into books on cyclone separators.
Usually: D1=D2>D3. For example: 100, 100, 40.
There is a centrifugal separator designed by a university for us, whose outlet dimensions are larger than the inlet dimensions; they are DN20, DN20, DN25