11. What is nn nppropri ormu the energy eantion for the simple enuntet excInnger

Question

11. What is nn nppropri ormu the energy eantion for the simple enuntet excInnger ?nd the control volume (dnshed line) bekne? (u: ?nternal en.rgy. Control Volume (n) SJesA(u+pl)pi.fids+esnulp)p fids o 12. The stress tensor for aNewtonian fluid is a 2nd order tensor, and it nccounts for... (a) body forces and surface forces due to contributions from pressure and both normal and tangential viscous stresses (b) surface forces due to contributions from pressure and tangential viscous stresses. (c) surface forces due to contributions from both normal and tangential viscous stresses. (d) surface forces due to contributions from pressure andbothnormal and tangential viscous (Note: the divergence of the stress tensor is a force per unit volume, c.f. Cauchy equation.) In an inviscid, incompressible flow with no effects of elevation change, how does the stagnation pressure change through a gradual contraction? (a) The stagnation pressure does not change. (b) The stagnation pressure increases. (c) The stagnation pressure decreases. (d) The stagnation pressure first increases, then decreases. 13. 14. Streamlines, defined by the equation ?? x dE# 0, can be described as: (a) For different times t, a streamline is the path described by a fluid particle. (b) At a given time t, streamlines are the paths described by fluid particles which passed through the same fixed point in space upstream. (c) Streamlines are tracer lines in a fluid, which at some time t were perpendicular to the general flow direction At a given time t, streamlines are the curves which are tangent to the instantaneous velocity field. (d)

Explanation / Answer

Solution-

Answer 11- C,

12- C

   13- a

14-d

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