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dP for turblance fluid at change of direction

dP for turblance fluid at change of direction

dP for turblance fluid at change of direction

(OP)
Hi All,

This question might be silly, but it has annoyed me for quite a while,

Say for a fully turbulence fluid, all fluid particles are flowing in all different directions, therefore the fluid main stream may have a direction, but each individual particles all have their own moving direction. Once the fluid hit a elbow or a bend, why would there be a pressure drop? as each individual particles are all still moving in all directions, hence no change to fluid condition.

Could someone please advise?

Regards

Spoonful.

RE: dP for turblance fluid at change of direction

Energy was required to change their direction. You have the wrong concept of hydraulic pressure. Pressure drop is not force/unit_area in the case of hydraulics, it is a unit of energy that has been expended. The same energy needed to effect the change in direction of the fluid at a bend, or force it to move ahead in a straight pipe.

"People will work for you with blood and sweat and tears if they work for what they believe in......" - Simon Sinek

RE: dP for turblance fluid at change of direction

And the wrong concept of turbulence. Yes, the motion of the particles has a random velocity component, but that random component is (must be) much smaller than the mean flow velocity. I.e., it is extremely unlikely that particles in the flow ever have a velocity in the negative (against the stream) direction. Not counting gross eddies.

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