2. Experiments have shown that, for airflow at T=35°C and V1= 100 m/s, the rate ofheat transfer from a turbine blade of characteristic length L₁ = 0.15 m and surfacetemperature Ts,1=300°C is q1=1500 W. What would be the heat transfer rate froma second turbine blade of characteristic length L2 = 0.3 m operating at Ts,2=400°Cin airflow of Tx-35°C and V2 = 50 m/s? The surface area of the blade may beassumed to be directly proportional to its characteristic length.Answer: 2066W

Answered: 2. Experiments have shown that, for…

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.54P

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Q1: Water at 80 oC is pumped through 100 m of stainless steel pipe, k=16 W/m.K of inner and outer radius 47 mm and 50 mm respectively. The heat transfer coefficient due to water is 2000 W/m2.K. The outer surface of the pipe loses heat by convection to air at 20 oC and the heat transfer coefficient is 200 W/m2.K. Calculate the heat flow through the pipe. Also calculate the heat flow through the pipe when a layer of insulation, k=0.1 W/m.K and 50 mm radial thickness is .wrapped around the pipe
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