5.26 WP Before being injected into a furnace, pulverized coal is preheated by passing it through a cylindrical tube whose surface is maintained at Tsur = 1000°C. The coal pellets are suspended in an airflow and are known to move with a speed of 3 m/s. If the pellets may be approximated as spheres of 1- mm diameter and it may be assumed that they are heated by radiation transfer from the tube surface, how long must the tube be to heat coal entering at 25°C to a temperature of 600°C? Is the use of the lumped capacitance method justified?
5.26 WP Before being injected into a furnace, pulverized coal is preheated by passing it through a cylindrical tube whose surface is maintained at Tsur = 1000°C. The coal pellets are suspended in an airflow and are known to move with a speed of 3 m/s. If the pellets may be approximated as spheres of 1- mm diameter and it may be assumed that they are heated by radiation transfer from the tube surface, how long must the tube be to heat coal entering at 25°C to a temperature of 600°C? Is the use of the lumped capacitance method justified?
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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Transcribed Image Text:5.26 WP Before being injected into a furnace, pulverized coal is preheated by passing it through a
cylindrical tube whose surface is maintained at Tsur = 1000°C. The coal pellets are suspended in an
airflow and are known to move with a speed of 3 m/s. If the pellets may be approximated as spheres of 1-
mm diameter and it may be assumed that they are heated by radiation transfer from the tube surface,
how long must the tube be to heat coal entering at 25°C to a temperature of 600°C? Is the use of the
lumped capacitance method justified?
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