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5-Regular Member

## Pressure drop in sharp bend

Hi!
I was wondering if someone can point me in the right direction.

Suppose you have a cylinder with a center drilled hole, at the end of the hole a perpendicular hole is drilled through the cylinder wall as shown below:

How can i calculate the pressure drop if the fluid flows from left to right.

The fluid is turbulent

Regards
Sigurd

4 REPLIES 4
23-Emerald I
(To:snã¦ss)

@snã¦ss wrote:

Hi!
I was wondering if someone can point me in the right direction.

Suppose you have a cylinder with a center drilled hole, at the end of the hole a perpendicular hole is drilled through the cylinder wall as shown below:

How can i calculate the pressure drop if the fluid flows from left to right.

The fluid is turbulent

Regards
Sigurd

People have been trying to solve this (with accuracy) for a long time.  A good finite element model, properly set up, will come close. There are numerous handbooks (Crane Company used to put out a really good one) that can assist an empirical estimate.

There are a lot of variables:  hole diameter, lengths, effective radius of the turn, Reynolds Number, etc.  The sharp turn at the end is the major problem.

21-Topaz I
(To:snã¦ss)

Hi

The first is theory behind pipe loss coefficient.

Second is experimental values of coefficient including mitred bends

Cheers

Terry

Theoretical Basics of Energy Losses in Bends
16-Pearl
(To:snã¦ss)

In order of preference:

a.) experiments

b.) CFD

c.) Equations.

d.) Tabulated loss parameters (k-factors or minor losses)

C & D are easiest.

For C here's one example that I'll assume has something close to your problem. (Idel'chik)

https://www.nrc.gov/docs/ML1220/ML12209A041.pdf

Crane Technical Paper 410 is good, as Fred points out - but not free.  Any fluids book should have some minor loss factors to get you going.

23-Emerald I
(To:DJF)

A careful web search can reveal a pdf of Crane TP 410

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