Homework Help is Here – Start Your Trial Now!
Engineering
Mechanical Engineering
A sphere at 120°C was being exposed to surrounding air at 30°C with convection coefficient of 33 W/m2K. Thermocouples were attached to the sphere on the surface, in its center, and in a random point inside the sphere. The thermocouples showed readings of approximately 100°C at 40s later. On the next day, a fan was switched on which provided an airstream of approximately 10 m/s surrounding the sphere. Analyze this situation to predict the time taken for the sphere to cool from 60°C to 40°C. The properties of the sphere material and air at the specified temperature are provided in Table 1 Table 1 Properties Air at 30°C Sphere material Density (kg/m³) Specific heat (J/kg.K) Kinematic viscosity (m2/s) 1.151 8000 1.007 x10 300 1.619 x10 Dynamic viscosity (N.s/m) Conductivity (W/m.K) 1.86 x105 0.0265 600 Prandtl Number 0.707 Note: Dynamic viscosity of air at 60°C is 2.002 x10 N.s/m2

A sphere at 120°C was being exposed to surrounding air at 30°C with convection coefficient of 33 W/m2K. Thermocouples were attached to the sphere on the surface, in its center, and in a random point inside the sphere. The thermocouples showed readings of approximately 100°C at 40s later. On the next day, a fan was switched on which provided an airstream of approximately 10 m/s surrounding the sphere. Analyze this situation to predict the time taken for the sphere to cool from 60°C to 40°C. The properties of the sphere material and air at the specified temperature are provided in Table 1 Table 1 Properties Air at 30°C Sphere material Density (kg/m³) Specific heat (J/kg.K) Kinematic viscosity (m2/s) 1.151 8000 1.007 x10 300 1.619 x10 Dynamic viscosity (N.s/m) Conductivity (W/m.K) 1.86 x105 0.0265 600 Prandtl Number 0.707 Note: Dynamic viscosity of air at 60°C is 2.002 x10 N.s/m2

Elements Of Electromagnetics
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
See similar textbooks
icon
Related questions
Question
A sphere at 120°C was being exposed to surrounding air at 30°C with convection coefficient of 33 W/m2K. Thermocouples were attached to the sphere on the surface, in its center, and in a random point inside the sphere. The thermocouples showed readings of approximately 100°C at 40s later. On the next day, a fan was switched on which provided an airstream of approximately 10 m/s surrounding the sphere. Analyze this situation to predict the time taken for the sphere to cool from 60°C to 40°C. The properties of the sphere material and air at the specified temperature are provided in Table 1 Table 1 Properties Air at 30°C Sphere material Density (kg/m³) Specific heat (J/kg.K) Kinematic viscosity (m2/s) 1.151 8000 1.007 x10 300 1.619 x10 Dynamic viscosity (N.s/m) Conductivity (W/m.K) 1.86 x105 0.0265 600 Prandtl Number 0.707 Note: Dynamic viscosity of air at 60°C is 2.002 x10 N.s/m2
Transcribed Image Text:A sphere at 120°C was being exposed to surrounding air at 30°C with convection coefficient of 33 W/m2K. Thermocouples were attached to the sphere on the surface, in its center, and in a random point inside the sphere. The thermocouples showed readings of approximately 100°C at 40s later. On the next day, a fan was switched on which provided an airstream of approximately 10 m/s surrounding the sphere. Analyze this situation to predict the time taken for the sphere to cool from 60°C to 40°C. The properties of the sphere material and air at the specified temperature are provided in Table 1 Table 1 Properties Air at 30°C Sphere material Density (kg/m³) Specific heat (J/kg.K) Kinematic viscosity (m2/s) 1.151 8000 1.007 x10 300 1.619 x10 Dynamic viscosity (N.s/m) Conductivity (W/m.K) 1.86 x105 0.0265 600 Prandtl Number 0.707 Note: Dynamic viscosity of air at 60°C is 2.002 x10 N.s/m2
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Similar questions
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY
SEE MORE TEXTBOOKS