Is it possible to draw streamline and thermlime for unsteady flow of fluid?
Yes you can. For instance, in order to find the local direction of a streamline you have to solve the vectorial product between local velocity and space differential, set equal to zero. However the family of lines you'll find will keep changing in time.
Marco
Dear Pronab,
I am not sure what a "thermline" is I don't find it defined anywhere. Maybe you want to see the motion of the energy in the fluid? If so there is a partial answer from Adrian Bejan's book "convection heat transfer". He defines a "heatfunction" and plots streamlines of it to show how the internal energy moves within the fluid by both conduction and convection. I wanted to extent this capability to unsteady compressible flow in which the temporal derivative of pressure becomes a strong term. Energy is carried around by static pressure waves which isentropically do work on the surrounding fluid.
cheers Martin Rose
You are able to do this for the instantaneous field only.
Dear V.A. Zharov do you mean that you can plot Bejan's heat function for an instant in time? if so the group dpbydt will be significant. Can this be done? Martin Rose
Dear Martin George Rose,
Your answer have helped me much. If you refer me some books related it then it will be helped more I think. Would you please help me?
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