Def eval(self, env): """ >>> from reader import read >>> new_env = global_env. copy() >>> new_env. update({'a': Number(1), 'b': Number(2)}) >>> add = CallExpr(Name('add'), [Literal(3), Name('a')]) >>> add. eval(new_env) Number(4) >>> new_env['a'] = Number(5) >>> add. eval(new_env) Number(8)

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.

Prove the equivalence between the two statements of the 2nd law of thermodynamics (i.e., a violation of one statement leads to the violatio the other statement)

Estimate the change in specific internal energy au and specific enthalpy h from inlet to outlet for ethylene glycol (a liquid) flowing through each of the following devices: (a) a heat exchanger where the glycol temperature increases from 20 °c to 80 °c; (b) a pump operating at about 25 °c and increasing the glycol pressure from 100 kpa to 8 mpa.