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A 20 cm-diameter copper sphere (k = 386 W/m°C, a = 11.234 ×10-5 m 2 /s, p = 8.954 g/cm3 cp = 383 J/kgºC) initially at a uniform temperature of 800 °C is suddenly dropped into liquid nitrogen at -196 °C with the heat transfer coefficient h = 30 W/m2 °C. How much time (in minutes) does it take for the sphere’s center temperature reaching 80°C?

A 20 cm-diameter copper sphere (k = 386 W/m°C, a = 11.234 ×10-5 m 2 /s, p = 8.954 g/cm3 cp = 383 J/kgºC) initially at a uniform temperature of 800 °C is suddenly dropped into liquid nitrogen at -196 °C with the heat transfer coefficient h = 30 W/m2 °C. How much time (in minutes) does it take for the sphere’s center temperature reaching 80°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
Problem 1.1P
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A 20 cm-diameter copper sphere (k = 386 W/m°C, a = 11.234 ×10-5 m 2 /s, p= 8.954 g/cm3, cp = 383 J/kgC) initially at a uniform temperature of 800 °C is suddenly dropped into liquid nitrogen at -196 °C with the heat transfer coefficient h minutes) does it take for the sphere's center temperature reaching 80°C? 30 W/m2 °C. How much time (in
Transcribed Image Text:A 20 cm-diameter copper sphere (k = 386 W/m°C, a = 11.234 ×10-5 m 2 /s, p= 8.954 g/cm3, cp = 383 J/kgC) initially at a uniform temperature of 800 °C is suddenly dropped into liquid nitrogen at -196 °C with the heat transfer coefficient h minutes) does it take for the sphere's center temperature reaching 80°C? 30 W/m2 °C. How much time (in
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