Consider a steel pipeline (AISI 1010) that is 1 m in diameter and has a wall thickness of 40 mm. The pipe is heavily insulated on the outside, and, before the initiation of flow, the walls of the pipe are at a uniform temperature of -20 •C. With the initiation of flow, hot oil at 60 •C is pumped through the pipe, creating a convective condition corresponding to h= 500 W/m² K at the inner surface of the pipe. a. What are the appropriate Biot and Fourier numbers 8 min after the initiation of flow? b. At t = 8 min, what is the temperature of the exterior pipe surface covered by the insulation? c. What is the heat flux q (W/m²) to the pipe from the oil at t = 8 min? d. How much energy per meter of pipe length has been transferred from the oil to the pipe at t= 8 min?

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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Consider a steel pipeline (AISI 1010) that is 1 m in diameter and has a wall thickness of 40 mm. The pipe is heavily insulated on the outside, and, before the initiation of flow, the walls of the pipe are at a uniform temperature of -20 ◦C. With the initiation of flow, hot oil at 60 ◦C is pumped through the pipe, creating a convective condition corresponding to h= 500 W/m2 K at the inner surface of the pipe.

a) What are the appropriate Biot and Fourier numbers 8 min after the initiation of flow?

b) At t = 8 min, what is the temperature of the exterior pipe surface covered by the insulation?

c) What is the heat flux q (W/m2 ) to the pipe from the oil at t = 8 min?

d)How much energy per meter of pipe length has been transferred from the oil to the pipe at t= 8 min?

Consider a steel pipeline (AISI 1010) that is 1 m in diameter and has
a wall thickness of 40 mm. The pipe is heavily insulated on the
outside, and, before the initiation of flow, the walls of the pipe are at
a uniform temperature of -20 •C. With the initiation of flow, hot oil at
60 •C is pumped through the pipe, creating a convective condition
corresponding to h= 500 W/m² K at the inner surface of the pipe.
a. What are the appropriate Biot and Fourier numbers 8 min after
the initiation of flow?
b. At t = 8 min, what is the temperature of the exterior pipe surface
covered by the insulation?
c. What is the heat flux q (W/m²) to the pipe from the oil at t = 8
min?
d. How much energy per meter of pipe length has been transferred
from the oil to the pipe at t= 8 min?
Transcribed Image Text:Consider a steel pipeline (AISI 1010) that is 1 m in diameter and has a wall thickness of 40 mm. The pipe is heavily insulated on the outside, and, before the initiation of flow, the walls of the pipe are at a uniform temperature of -20 •C. With the initiation of flow, hot oil at 60 •C is pumped through the pipe, creating a convective condition corresponding to h= 500 W/m² K at the inner surface of the pipe. a. What are the appropriate Biot and Fourier numbers 8 min after the initiation of flow? b. At t = 8 min, what is the temperature of the exterior pipe surface covered by the insulation? c. What is the heat flux q (W/m²) to the pipe from the oil at t = 8 min? d. How much energy per meter of pipe length has been transferred from the oil to the pipe at t= 8 min?
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