A ball with diameter D = 5 cm and with initial temperature 0 °C is to be exposed to air at 33°C, h = 12 W/m² °C. Take the ball properties are Cp 235 J/kg K, and p 10500 kg/m³, k= 429 W/m.K. Determine the following 1. The thermal time constant. 2. Biot number. 3. How long will it take the ball to reach 25°C, and find the value of Fourier number at this time.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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A ball with diameter D = 5 cm and with initial temperature 0 °C is to be exposed to air at
33°C, h 12 W/m² °C. Take the ball properties are Cp = 235 J/kg K, and p 10500 kg/m³,
k= 429 W/m.K. Determine the following
1. The thermal time constant.
2. Biot number.
3. How long will it take the ball to reach 25°C, and find the value of Fourier number at this time.
Transcribed Image Text:A ball with diameter D = 5 cm and with initial temperature 0 °C is to be exposed to air at 33°C, h 12 W/m² °C. Take the ball properties are Cp = 235 J/kg K, and p 10500 kg/m³, k= 429 W/m.K. Determine the following 1. The thermal time constant. 2. Biot number. 3. How long will it take the ball to reach 25°C, and find the value of Fourier number at this time.
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