A tube bank uses an aligned arrangement of 12-mm diameter tubes with ST = SL = 20 mm. There are 8 rows of tubes with 20 tubes in each row. The tubes are maintained at a surface temperature of 400K, while the flue gas at 30OK and a velocity of 5 m/s are in cross flow over the tubes. The properties of the flue gas approximated as those of air at 300K are kinematic viscosity v=15.89x10-6 m²/s, k=26.3×10-3 W/m-K, Pr=0.707, p=1.1614 kg/m³, cp=1007 J/kg-K. At 400K, Pr;=0.690. Determine 1) Average convention heat transfer coefficient; 2) Rate of heat transfer per unit length of the tubes in the bank.

A tube bank uses an aligned arrangement of 12-mm diameter tubes with ST = SL = 20 mm. There are 8 rows of tubes with 20 tubes in each row. The tubes are maintained at a surface temperature of 400K, while the flue gas at 30OK and a velocity of 5 m/s are in cross flow over the tubes. The properties of the flue gas approximated as those of air at 300K are kinematic viscosity v=15.89x10-6 m²/s, k=26.3×10-3 W/m-K, Pr=0.707, p=1.1614 kg/m³, cp=1007 J/kg-K. At 400K, Pr;=0.690. Determine 1) Average convention heat transfer coefficient; 2) Rate of heat transfer per unit length of the tubes in the bank.

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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Concept explainers

Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.

Question

A tube bank uses an aligned arrangement of 12-mm diameter tubes with ST = SL = 20 mm. There are 8 rows of tubes with 20 tubes in each row. The tubes are maintained at a surface temperature
of 400K, while the flue gas at 300OK and a velocity of 5 m/s are in cross flow over the tubes. The properties of the flue gas approximated as those of air at 300K are kinematic viscosity v=15.89x10-6
m2/s, k=26.3x10³ W/m-K, Pr=0.707, p=1.1614 kg/m³, Cp=1007 J/kg-K. At 400K, Pr;=0.690. Determine
1)
Average convention heat transfer coefficient;
2)
Rate of heat transfer per unit length of the tubes in the bank.

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