Answer Happy

Q4Q8. Consider a hypothetical fluid flowing in a duct. The components of an electronic system dissipating 200 W are located in a 120-m-long circular horizontal duct of 10-cm diameter. The components in the duct are cooled by a forced hypothetical fluid flow, which enters at 30°C at a rate of 0.01 kg/s. The specific heat of the hypothetical fluid throughout this problem is 1 kJ/kg-K. Assume 90 percent of the heat generated inside is transferred to the hypothetical fluid flowing through the duct and the remaining 10 percent is lost through the outer surfaces of the duct. Assume the following thermodynamics properties for the hypothetical fluid throughout this problem. Prandtl Number=1.0: Thermal conductivity = 1 W/m-K; density 1.0 Kg/m³; Kinematic viscosity = 0.0001 m²/s. Question 4 (10 points) 4 Listen Determine exit temperature of the fluid. Choose the value that is the closest to the answer.
At which location, the highest pipe surface temperature is observed? Ox= 40 m Ox=8m Ox= 120 m Ox= 12 m Ox= 100 m
Estimate Re number for this flow. Chose the value that is the closest to the answer. 2373 253 1273 1363. 4503
Estimate the length of the hydrodynamics entrance. Chose the value that is the closest to the answer. 6.37 m 128 m 231 m 5.57 m 63 m
Estimate the Nusselt number for the flow in the duct. Assume smooth inner surface for the duct. Chose the value that is the closest to the answer. 20.45 4.36 12:36 8.36