3JA tirbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 Wim K). The temperature at the root is 500 C. The blade is exposed to a hot gas at 870 C. The heat transfer coefficient between the blade surface and gas is 442 W/m K. Determine the temperature distribution and rate of heat flow at the root of the blade, Assume the tip of the blade to be insulated. b) The hot combustion gases of a fumace are separated from the ambient air and its surrounding, which are at 20 C, by a brick wall 0.5 m thick. The brick has a themal conductivity of S W/mk and a surface emissivity of 0.6. Under steady-state conditions an Page no.1 of 1 outer surface temperature of 120°C is measirod. Free convection heat transler to the air adjoining the surface is characterized by a convection coefficiel of 15 Wim K What is the brick inner surface temperature

3JA tirbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 Wim K). The temperature at the root is 500 C. The blade is exposed to a hot gas at 870 C. The heat transfer coefficient between the blade surface and gas is 442 W/m K. Determine the temperature distribution and rate of heat flow at the root of the blade, Assume the tip of the blade to be insulated. b) The hot combustion gases of a fumace are separated from the ambient air and its surrounding, which are at 20 C, by a brick wall 0.5 m thick. The brick has a themal conductivity of S W/mk and a surface emissivity of 0.6. Under steady-state conditions an Page no.1 of 1 outer surface temperature of 120°C is measirod. Free convection heat transler to the air adjoining the surface is characterized by a convection coefficiel of 15 Wim K What is the brick inner surface temperature

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

a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12
cm is made of stainless steel (k=23.3 Wim K). The temperature at the root is 500 C. The
blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade
surface and gas is 442 W/im K. Determine the temperature distribution and rate of beat flow
at the root of the blade, Assume the tip of the blade to be insulated.
b) The hot combustion gases of a fumace are separated from the ambient air and its
surounding, which are at 20°C, by a brick wall 0.5 m thick. The brick has a themal
conductivity of 5 W/mk and a surface emissivity of 0.6. Under steady-state conditions an
Page no.1 of 1
outer surface temperature of 120°C is measured Free convection heat transter to the air
adjoining the surface is characterized by a convection coefficient of 15 Wim K What is the
brick inner surface temperature

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