Driving force for fluid flow
Driving force for fluid flow is Energy per unit mass or total head available at the point of location.
Justification:
If you observe the flow in venturi meter, it will become more clear. consider 3 points as shown in the below figure.
Assume P1, P2, P3 are pressures at 1, 2 and 3 points. Here according to cross section area variation we can say P1 > P2 < P3. It shows that P3 > P2 but fluid is moving from 2 point to 3 point, so we can say pressure is not the driving force. Similarly we can say velocity is also not the driving force.
So here the driving force is combination of pressure head and velocity head that is total head.
Driving force for fluid flow is Energy per unit mass or total head available at the point of location.
Justification:
If you observe the flow in venturi meter, it will become more clear. consider 3 points as shown in the below figure.
Assume P1, P2, P3 are pressures at 1, 2 and 3 points. Here according to cross section area variation we can say P1 > P2 < P3. It shows that P3 > P2 but fluid is moving from 2 point to 3 point, so we can say pressure is not the driving force. Similarly we can say velocity is also not the driving force.
So here the driving force is combination of pressure head and velocity head that is total head.
pressure is not a driving frce please eloborate it ?????
ReplyDeletePressure isn't a driving force please eloborate it?????
ReplyDeleteas in the difference in the pressure ALONE is not causing the flow. It is the combination of pressure as well s velocity head which acts as the driving force.
ReplyDeleteBut the velocity is a function of pressure in fluid flow
Deletefor flowing of fluid there should also be role of potential head
ReplyDeletefor flowing of fluid there should also be role of potential head
ReplyDeleteIf head is the driving force then it will violate the Bernoulli's principle which stated head remains constant in a streamline flow how it is possible
ReplyDeletei too have the same doubt , ans anyone explain?
DeleteBernoulli's principle didn't accounts frictional losses but in actual practice there will be losses.
Deletedensity difference
ReplyDeleteBut according to Bernoulli theorm total energy remains constant ,
ReplyDeleteSo I think energy is not driving force for fluid flow.