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Problem 2. In cement production the intermediate product which leaves the cement kiln is called clinker. In a certain cement production process, clinker particles leave the kiln as spherical balls of 2 cm average radius at 300°C and cooled by blowing air at 25°C. The heat transfer coefficient between the air and the clinker particles can be taken as 200 W/m²K and the thermal conductivity of the clinker can be taken as 2 W/m.K. Assuming a heat diffusivity of 3x107 m²/s for the particles, estimate the time necessary for the center temperature of an average clinker particle to cool down to 50°C.

Problem 2. In cement production the intermediate product which leaves the cement kiln is called clinker. In a certain cement production process, clinker particles leave the kiln as spherical balls of 2 cm average radius at 300°C and cooled by blowing air at 25°C. The heat transfer coefficient between the air and the clinker particles can be taken as 200 W/m²K and the thermal conductivity of the clinker can be taken as 2 W/m.K. Assuming a heat diffusivity of 3x107 m²/s for the particles, estimate the time necessary for the center temperature of an average clinker particle to cool down to 50°C.

Introduction to Chemical Engineering Thermodynamics
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
Chapter1: Introduction
Section: Chapter Questions
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Problem 2. In cement production the intermediate product which leaves the cement kiln is called clinker. In a certain cement production process, clinker particles leave the kiln as spherical balls of 2 cm average radius at 300°C and cooled by blowing air at 25°C. The heat transfer coefficient between the air and the clinker particles can be taken as 200 W/m²K and the thermal conductivity of the clinker can be taken as 2 W/m.K. Assuming a heat diffusivity of 3x107 m²/s for the particles, estimate the time necessary for the center temperature of an average clinker particle to cool down to 50°C.
Transcribed Image Text:Problem 2. In cement production the intermediate product which leaves the cement kiln is called clinker. In a certain cement production process, clinker particles leave the kiln as spherical balls of 2 cm average radius at 300°C and cooled by blowing air at 25°C. The heat transfer coefficient between the air and the clinker particles can be taken as 200 W/m²K and the thermal conductivity of the clinker can be taken as 2 W/m.K. Assuming a heat diffusivity of 3x107 m²/s for the particles, estimate the time necessary for the center temperature of an average clinker particle to cool down to 50°C.
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