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Fluid flow,acceleration and bernoulli's theorem 
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#1
Feb2713, 05:45 AM

P: 1

Even though the velocity of each particle is constatnt in staedy flow,all the fluid particles are accelerating.If velocity of every particle in the steady state fluid flow is constant how does the fluid accelerate?In that case,why is there a bernoulli theorem for unsteady flow?



#2
Feb2713, 10:03 AM

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I assume you mean the average velocity of the molecules of a fluid. What can happen is as the fluid accelerates, the movement of the molecules becomes less random, and the net component of velocity in the direction of flow increases.



#3
Feb2713, 01:56 PM

P: 102

Not understanding the question. The velocity in a steady flow is not necessarily constant. It may be constant at a particular point, but may vary at different locations in the stream. For example, bernoulli's principle is usually applied to a venturi. The pressure drops and the velocity increases in the narrow part of the venturi. This is a result of the conservation of mass and the conservation of energy.



#4
Feb2713, 06:31 PM

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Thanks
PF Gold
P: 5,259

Fluid flow,acceleration and bernoulli's theorem



#5
Feb2713, 07:04 PM

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P: 7,133




#6
Feb2713, 07:39 PM

Sci Advisor
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Thanks
PF Gold
P: 5,259




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