1. Pump extracts energy from a flowing fluid. _______
2. The flow within a boundary layer can be considered inviscid flow. _______
3. Laminar boundary layer velocity profile has more mixing than the velocity profile in a turbulent boundary layer. ________
4. Flow within the log-law region is considered laminar. ________
5. In a physical modeling of air flow over a aircraft, Froude number is important._______

Answer:

Explanation:

1)  Pump does not extract energy from a flowing fluid instead is converts mechanical energy to fluid energy  ( i.e. initial statement is  FALSE )

2) Flow within a boundary layer cannot be considered an inviscid flow because flow within a boundary layer is considered a viscid flow  (  i.e. initial statement is FALSE )

3) Laminar boundary layer velocity profile does not have more mixing than the velocity profile in a turbulent boundary layer because in a turbulent boundary layer the mixing of velocity profile is higher/more  ( i.e. initial statement is FALSE )

4 ) Flow within the log-law region is considered Turbulent and not Laminar( i.e. initial statement is FALSE )

5) In a physical modeling of air flow over an aircraft the Reynold number is more important than the Froude number (  i.e. initial statement is FALSE )

The 150 mm thick wall of a gas fired furnace is constructed of fireclay brick (k=1.5 W/m.K) , tho=2600 kg/m3, and cp=1000 J/kg.K ) and is well insulated at its outer surface. The wall is at a uniform initial temperature of 20 degree C, when the burners are fired and inner surface is exposed to products of combustion for which T infinity=950 degree C and h=100 W/ m2.K.
(A) How long does it take for the outer surface of the wall to reach a temperature of 750 degree C?
(B) plot the temperature distribution in the wall at the foregoing time.