Ex. 3.15: air at 101.325 kPa and 308 K (35 °C) flows across a 50 mm diameter cylinder at a velocity of 50 m/s. The cylinder surface is maintained at a temperature of 423 K (150 °C) Estimate the heat loss per unit length of the cylinder. Data: The physical properties of air at the film temperature of 365.5 K are: H= 2.14 x 10-5 kg/(m-s), p = 0.966 kg/m³, k = 0.0312 W/(m-K) and Npr = 0.695.

Introduction to Chemical Engineering Thermodynamics
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Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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Heat Transfer
176
Convection
Ex. 3.15: air at 101.325 kPa and 308 K (35 °C) flows across a 50 mm diameter cylinder at a
velocity of 50 m/s. The cylinder surface is maintained at a temperature of 423 K (150 °C).
Estimate the heat loss per unit length of the cylinder.
Data: The physical properties of air at the film temperature of 365.5 K are:
H= 2.14 x 10-5 kg/(m-s), p = 0.966 kg/m³, k = 0.0312 W/(m-K) and Npr
0.695.
Transcribed Image Text:Heat Transfer 176 Convection Ex. 3.15: air at 101.325 kPa and 308 K (35 °C) flows across a 50 mm diameter cylinder at a velocity of 50 m/s. The cylinder surface is maintained at a temperature of 423 K (150 °C). Estimate the heat loss per unit length of the cylinder. Data: The physical properties of air at the film temperature of 365.5 K are: H= 2.14 x 10-5 kg/(m-s), p = 0.966 kg/m³, k = 0.0312 W/(m-K) and Npr 0.695.
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