Air at 300K and 1 bar enters from a 900 elbow connected to a channel with surface of constant temperature of 600K. Estimate the outlet temperature of the fluid at the following conditions: a) The channel is assumed smooth and has dimensions of 3" NPS and length of 0.8 m. The flowrate of air is 0.05 kg/s b) The channel is not assumed smooth. For other conditions, use (a). c) Using conditions of (b) but the length of the channel is 4 m.

Air at 300K and 1 bar enters from a 900 elbow connected to a channel with surface of constant temperature of 600K. Estimate the outlet temperature of the fluid at the following conditions: a) The channel is assumed smooth and has dimensions of 3" NPS and length of 0.8 m. The flowrate of air is 0.05 kg/s b) The channel is not assumed smooth. For other conditions, use (a). c) Using conditions of (b) but the length of the channel is 4 m.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Solve full

Air at 300K and 1 bar enters from a 900 elbow
connected to a channel with surface of
constant temperature of 600K. Estimate the
outlet temperature of the fluid at the following
conditions:
a) The channel is assumed smooth and
has dimensions of 3" NPS and length of
0.8 m. The flowrate of air is 0.05 kg/s
b) The channel is not assumed smooth.
For other conditions, use (a).
c) Using conditions of (b) but the length of
the channel is 4 m.
d) The channel is 1 cm wide, 0.5 m high
and 0.8 m long and the flowrate of air is
0.05 kg/s. *Guide: Hydraulic diameter as
characteristic dimension
e) Using conditions of (d) except that the
flowrate is 3.6 kg/hr. *Guide: μs, μb
f) Using conditions of (d) except the length
is 1.5 m. *Guide: Hydraulic diameter as
characteristic dimension

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Step 1: Heat transfer coefficient

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Step 2: Outlet temperature for smooth surface

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Step 3: Surface is assumed to rough

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Step 4: When length is increased by 4 m.

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