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Now, let's revisit Example 2B.1. We solved that problem by using the Nu correlation for mixed flow and found that the heat transfer rate is 48.5 kW. We want to revisit that decision. (a) Find out what portion/fraction of the flow is laminar and what portion/fraction is turbulent. In other words, how much of the 16-m length is under laminar flow and how much is under turbulent flow? (Hint: You will have to find out the location where the flow became turbulent) (b) If one assumed the flow to be fully turbulent (for the entire length) instead of assuming it mixed, how much will the rate of heat transfer change from the answer given in the example?

Now, let's revisit Example 2B.1. We solved that problem by using the Nu correlation for mixed flow and found that the heat transfer rate is 48.5 kW. We want to revisit that decision. (a) Find out what portion/fraction of the flow is laminar and what portion/fraction is turbulent. In other words, how much of the 16-m length is under laminar flow and how much is under turbulent flow? (Hint: You will have to find out the location where the flow became turbulent) (b) If one assumed the flow to be fully turbulent (for the entire length) instead of assuming it mixed, how much will the rate of heat transfer change from the answer given in the example?

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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Answer the problem that starts with Now, let's revisit Example 2B.1. Re(Local)=5.049*10^6 Nu(Local)=6904.3 h(local)=10.52 W/m^2 K Use 2B1 as reference (DONT ANSWER 2B1) Example 2B.1: Cold air of 2°C is flowing at an average velocity of 4.5 m/s over the 16-m-by-16-m roof of a building. The flow direction is along a side of the roof. If the roof temperature is kept uniform at 20°C by the heating system of the bulding, what is the rate of convective heat transfer from the roof to the outside air? Transcribed Image Text: Example 2B.1: Cold air of 2°C is flowing at an average velocity of 4.5 m/s over the 16-m-by-16-m roof of a building. The flow direction is along a side of the roof. If the roof temperature is kept uniform at 20°C by the heating system of the bulding, what is the rate of convective heat transfer from the roof to the outside air? Now, let's revisit Example 2B.1. We solved that problem by using the Nu correlation for mixed flow and found that the heat transfer rate is 48.5 kW. We want to revisit that decision. (a) Find out what portion/fraction of the flow is laminar and what portion/fraction is turbulent. In other words, how much of the 16-m length is under laminar flow and how much is under turbulent flow? (Hint: You will have to find out the location where the flow became turbulent) (b) If one assumed the flow to be fully turbulent (for the entire length) instead of assuming it mixed, how much will the rate of heat transfer change from the answer given in the example?
Transcribed Image Text:Answer the problem that starts with Now, let's revisit Example 2B.1. Re(Local)=5.049*10^6 Nu(Local)=6904.3 h(local)=10.52 W/m^2 K Use 2B1 as reference (DONT ANSWER 2B1) Example 2B.1: Cold air of 2°C is flowing at an average velocity of 4.5 m/s over the 16-m-by-16-m roof of a building. The flow direction is along a side of the roof. If the roof temperature is kept uniform at 20°C by the heating system of the bulding, what is the rate of convective heat transfer from the roof to the outside air? Transcribed Image Text: Example 2B.1: Cold air of 2°C is flowing at an average velocity of 4.5 m/s over the 16-m-by-16-m roof of a building. The flow direction is along a side of the roof. If the roof temperature is kept uniform at 20°C by the heating system of the bulding, what is the rate of convective heat transfer from the roof to the outside air? Now, let's revisit Example 2B.1. We solved that problem by using the Nu correlation for mixed flow and found that the heat transfer rate is 48.5 kW. We want to revisit that decision. (a) Find out what portion/fraction of the flow is laminar and what portion/fraction is turbulent. In other words, how much of the 16-m length is under laminar flow and how much is under turbulent flow? (Hint: You will have to find out the location where the flow became turbulent) (b) If one assumed the flow to be fully turbulent (for the entire length) instead of assuming it mixed, how much will the rate of heat transfer change from the answer given in the example?
oner flat plate, I sothermal sur face (tenp is un ferm) Lauinar /turo / mixed Uoo L External flow Reca for flat ptale Sxios מ xף4סי5 Turonlent Find Rey 5.049 x 10> Reu 5.049 X 10 ニ く Lam turb 4/s 2 B.3 NuL= (o037 Re-A) Pr 2 Bo3 037 Re -A) Pr A=871 ニ Re< Rex Rey tuyb. 6904.3 16m ニ Lami now K JuL う fs t Nuv ニ %3D
Transcribed Image Text:oner flat plate, I sothermal sur face (tenp is un ferm) Lauinar /turo / mixed Uoo L External flow Reca for flat ptale Sxios מ xף4סי5 Turonlent Find Rey 5.049 x 10> Reu 5.049 X 10 ニ く Lam turb 4/s 2 B.3 NuL= (o037 Re-A) Pr 2 Bo3 037 Re -A) Pr A=871 ニ Re< Rex Rey tuyb. 6904.3 16m ニ Lami now K JuL う fs t Nuv ニ %3D
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