Hydrogen at 15°C and at a pressure of 1 atm is flowing along a flat plate at a velocity of 3 m/s. If the plate is 0.3 m wide and at 71°C, calculate the following quantities at x = 0.3 m and at the distance corresponding to the transition point, i.e., Rex = 5 ?? 105. (Take properties at 43°C.)

(a) Hydrodynamic boundary layer thickness, in cm.

(b) Thickness of thermal boundary layer, in cm.

(c) Local friction coefficient, dimensionless.

(d) Average friction coefficient, dimensionless.

(e) Drag force, in N.

(f) Local convective-heat-transfer coefficient, in W/(m2 °C).

(g) Average convective-heat-transfer coefficient, in W/(m2 °C).

(h) Rate of heat transfer, in W.

GIVEN

Hydrogen flowing over a flat plate

Hydrogen temperature (T???) = 15°C

Hydrogen pressure = 1 atm

Velocity (U???) = 3 m/s

Plate temperature (Tw) = 71°C

Width of plate = 0.3 m

ASSUMPTIONS

Steady state

Constant fluidproperties

Transcribed Image Text:

Transllon Hydrogen Ty = 71°C U.-3 m/s T.= 15°C Xe Re, =5x 105