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n Aluminum ball of 1 cm in radius initially at 300 °C is immersed in path of water th

n Aluminum ball of 1 cm in radius initially at 300 °C is immersed in path of water th

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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7.) An Aluminum ball of 1 cm in radius initially at 300 °C is immersed in path of water that has a temperature of 30 °C where the convection heat transfer is 1000 W/m2.K. How much it takes for the ball to reach 70 °C. 8. Air at 2 atm and 50 °C flows across a large concrete surface 15 m wide and length of 4 m and is maintained at 85°C. The flow velocity is 0.4 m /s. Calculate the convection heat loss from the surface. For air take [u=1.906x10 5 kg/m.s , k =0.0281 W/m •C, Pr=0.7, R=287 J/kg.K] Assume Nu =2 Nu x-L =0.664 Re L/2 Pr1/3
Transcribed Image Text:7.) An Aluminum ball of 1 cm in radius initially at 300 °C is immersed in path of water that has a temperature of 30 °C where the convection heat transfer is 1000 W/m2.K. How much it takes for the ball to reach 70 °C. 8. Air at 2 atm and 50 °C flows across a large concrete surface 15 m wide and length of 4 m and is maintained at 85°C. The flow velocity is 0.4 m /s. Calculate the convection heat loss from the surface. For air take [u=1.906x10 5 kg/m.s , k =0.0281 W/m •C, Pr=0.7, R=287 J/kg.K] Assume Nu =2 Nu x-L =0.664 Re L/2 Pr1/3
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