convection

2. viscosity is due to ____ and molecular momentum between fluid
7. potential function exist for ____ flow
10. velocity potential negative derivative with respect to any direction gives fluid ____in that direction
11. the shear stress of fluid element is ____proportional to the rate of shear strain
12. ____number is a convenient measure of convective heat transfer coefficient.
14. an ___fluid is one which has no viscosity, surface tension and is incompressible
15. ____function whose partial derivative with respect to any direction gives the velocity component at right angles.

1. property of fluid which determines the resistance to shear stresses
3. lines where velocity potential is constant
4. _____number is related with natural convection heat transfer
5. Thermal diffusivity indicates the heat energy transfer by ____process
6. can be treated as ideal fluid
8. _____number is the ratio of mass heat flow rate by convection to the flow rate by conduction under a unit temperature gradient and through a thickness L.
9. for irrotational flow , both stream function and velocity function satisfy ____equation
13. ____number is the ratio of heat transfer coefficient to the flow of heat per unit temperature rise due to the velocity of the fluid.