A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal conductivity and thickness of the insulation coating are 0.1 W/(mK) and 1 mm, respectively. The material of the plane wall is stainless steel 304. The density, thermal conductivity, and specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(m-K), and 477 J/(kg-K), respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the insulation coating surface is 70 W/(m²-K). Insulation Coating Stainless Steel 304 Oven Gas Perfectly Insulated Wall X L 3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the stainless steel? The answer should be given in the unit of W/(m²-K). 3-2) What is the value of the Biot number? 3-3) What is the time required for the inner surface of the stainless steel 304 to reach the temperature of 900 °C? The answer should be given in the unit of s. 3-4) What is the temperature of the exposed surface of the insulation coating at this time? The answer should be given in the unit of °C.
A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal conductivity and thickness of the insulation coating are 0.1 W/(mK) and 1 mm, respectively. The material of the plane wall is stainless steel 304. The density, thermal conductivity, and specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(m-K), and 477 J/(kg-K), respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the insulation coating surface is 70 W/(m²-K). Insulation Coating Stainless Steel 304 Oven Gas Perfectly Insulated Wall X L 3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the stainless steel? The answer should be given in the unit of W/(m²-K). 3-2) What is the value of the Biot number? 3-3) What is the time required for the inner surface of the stainless steel 304 to reach the temperature of 900 °C? The answer should be given in the unit of s. 3-4) What is the temperature of the exposed surface of the insulation coating at this time? The answer should be given in the unit of °C.
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
Related questions
Question
Transcribed Image Text:A plane wall of an oven with an insulation coating is attached to an insulated wall. The thermal
conductivity and thickness of the insulation coating are 0.1 W/(m K) and 1 mm, respectively.
The material of the plane wall is stainless steel 304. The density, thermal conductivity, and
specific heat capacity of the stainless steel 304 are 7900 kg/m³, 74.9 W/(mK), and 477 J/(kg-K),
respectively. The wall thickness of the stainless steel 304 is 15 mm. The temperature of the
plane wall with the insulated coating is initially maintained at 30 °C. Suddenly, hot gas with a
temperature of 1000 °C enters the oven. The convection heat transfer coefficient at the
insulation coating surface is 70 W/(m²-K).
Insulation Coating
Stainless Steel 304
Oven Gas
Perfectly Insulated Wall
1
X
L
3-1) What is the overall heat transfer coefficient per unit area from the gas to the surface of the
stainless steel? The answer should be given in the unit of W/(m²-K).
3-2) What is the value of the Biot number?
3-3) What is the time required for the inner surface of the stainless steel 304 to reach the
temperature of 900 °C? The answer should be given in the unit of s.
3-4) What is the temperature of the exposed surface of the insulation coating at this time? The
answer should be given in the unit of °C.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 3 steps with 3 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY