5.41 A steel pipe 1 m in diameter and 40 mm wall thickness is heavily insulatedon the outside and is originally at -20°C. A hot oil at 60°C is nowpumped through the pipe resulting in a convective surface conditionwith h= 500 W/m2 K at the inner surface of the pipe. What is thetemperature of the exterior pipe surface 8 min after the start of flow. Alsocalculate the heat flux to the pipe from the oil and the energy transferredper metre of pipe length from the oil to the pipe at/ = 8 min. (For steel at20°C, p =O= 18.8 x 10-6 m2/s)434 J/kg. K, k = 63.9 W/mK,[41°C,-8000 W/m2,-2.6x 107 J/m]7823 kg/m, c =

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n the pipe resulting in a ce V/m2 K at the inner surfac he exterior pipe surface 8 m. at flux to the pine from the c

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.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.33P

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Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.

Question

5.41 A steel pipe 1 m in diameter and 40 mm wall thickness is heavily insulated
on the outside and is originally at -20°C. A hot oil at 60°C is now
pumped through the pipe resulting in a convective surface condition
with h
= 500 W/m2 K at the inner surface of the pipe. What is the
temperature of the exterior pipe surface 8 min after the start of flow. Also
calculate the heat flux to the pipe from the oil and the energy transferred
per metre of pipe length from the oil to the pipe at/ = 8 min. (For steel at
20°C, p =
O= 18.8 x 10-6 m2/s)
434 J/kg. K, k = 63.9 W/mK,
[41°C,-8000 W/m2,-2.6x 107 J/m]
7823 kg/m, c =

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