Question

What is the Reynolds number for the pipe section BE in the diagram?

warm moist air D Pump3 Coo water Spray condenser 'Gate valves AZBE ool condenser water B COOL Waar besim AZAB cooling tower А Pump4 River Check valve & strainer

Known values;

mean velocity: v= 15.2 m/s

density of water: p= 1000 kg/m^3

Diameter of pipe:    D = 0.411m

Pressure drop across the condenser for the cooling water:    Δp_CD = 17.5 kPa

Temperature rise in the condenser for the cooling water: ΔT_CD = 11.5 ^oC

The cool water basin temperature:     16.5 ^oC

Elevation difference between BE ΔZ_BE=  4.4 m

Velocity at the surface of the cool water basin: C_B = 0 m/s

Velocity at the exit of the warm water spray: Same as velocity in the pipe

Answer 1

Soln Given data, mean velocity IV = 15.2 m/s Density of water, f = 1000 kg/m3 Diameten of pipe, D=0.411 m Tempenature in section, B, TB = 16.5°C Temperature in section E, TE = TB + ATED = 16.5+11.5 TE=28 °C mean temperature, T = Tette 2 T = 1605 +28 2 T= 22.25°C Dynamic viscosity of water at 22.25°C M = 0.9476x10 3 pas Reynolds number, Re = pro 100 ox 15.2 x 0.411 (0.94.76X10-3) he 6592 655.13