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Transition in Pipe Size

Transition in Pipe Size

Transition in Pipe Size

(OP)
I am in the process of developing a mixing stage for a process I am working on.  To minimize the overall length in the process flow direction, I have chosen to use mixing elements that are smaller in diameter than the upstream/downstream piping.  I am trying to determine a way to minimize the effect of the flow stream reduction/expansion with the use of baffles (I really want, again, to minimize the overall length required for this unit operation).  Has anyone ever seen any information related to the sizing/placement/design of baffles to help in distributing the flow at the stepped inlet and outlet of the mixing stage (6" to 3" to 6")?  I cannot afford the length required by a "perfect" reducer geometry on both ends of the mixing stage.

rjw57

RE: Transition in Pipe Size

Why should you bother with "perfect" transitions? You want to create turbulence (for mixing) dont you?

Best regards

Morten

RE: Transition in Pipe Size

(OP)
Morten

The mixers do their own job of crerating turbulence (actually, they create shear to be technical about it).  I have upstream and downstream processes that rely on the fact that the flowstream occupy the better portion of the 6" tube.  Without some form of transition, I would expect the flow on the up/down stream sides to tend towards channeling down the middle, approximating the 3" mixer diameter.  Thank you for your reply.

rjw57

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