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(a) Air at 1 atm (abs) is flowing through a tube having an inside diameter of 50 mm at a velocity of 15 m/s, average temperature of 350 K. The inside wall temperature is held constant at 400 K by steam condensing outside the tube wall. (i) Calculate the heat transfer coefficient. (ii) How will the heat transfer coefficient change if increasing the flow velocity and why? (b) Water at 1 atm flows inside a tube of 15 cm diameter under local boiling conditions where the tube wall temperature is 18°C above the saturation temperature. (i) Estimate the heat transfer rate in a 2 m length of tube. (ii) For the same conditions, the boiling pressure is increased to 10 atm, estimate the heat transfer rate. (iii) Comment on the effect of pressure on the boiling heat transfer coefficient and heat transfer rate.

(a) Air at 1 atm (abs) is flowing through a tube having an inside diameter of 50 mm at a velocity of 15 m/s, average temperature of 350 K. The inside wall temperature is held constant at 400 K by steam condensing outside the tube wall. (i) Calculate the heat transfer coefficient. (ii) How will the heat transfer coefficient change if increasing the flow velocity and why? (b) Water at 1 atm flows inside a tube of 15 cm diameter under local boiling conditions where the tube wall temperature is 18°C above the saturation temperature. (i) Estimate the heat transfer rate in a 2 m length of tube. (ii) For the same conditions, the boiling pressure is increased to 10 atm, estimate the heat transfer rate. (iii) Comment on the effect of pressure on the boiling heat transfer coefficient and heat transfer rate.

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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Air at 1 atm (abs) is flowing through a tube having an inside diameter of 50 mm at a velocity of 15 m/s, average temperature of 350 K. The inside wall temperature is held constant at 400 K by steam condensing outside the tube wall. (a) (i) Calculate the heat transfer coefficient. (ii) How will the heat transfer coefficient change if increasing the flow velocity and why? (b) Water at 1 atm flows inside a tube of 15 cm diameter under local boiling conditions where the tube wall temperature is 18°C above the saturation temperature. (i) Estimate the heat transfer rate in a 2 m length of tube. For the same conditions, the boiling pressure is increased to 10 atm, estimate the heat transfer rate. (ii) (iii) Comment on the effect of pressure on the boiling heat transfer coefficient and heat transfer rate. 3.
Transcribed Image Text:Air at 1 atm (abs) is flowing through a tube having an inside diameter of 50 mm at a velocity of 15 m/s, average temperature of 350 K. The inside wall temperature is held constant at 400 K by steam condensing outside the tube wall. (a) (i) Calculate the heat transfer coefficient. (ii) How will the heat transfer coefficient change if increasing the flow velocity and why? (b) Water at 1 atm flows inside a tube of 15 cm diameter under local boiling conditions where the tube wall temperature is 18°C above the saturation temperature. (i) Estimate the heat transfer rate in a 2 m length of tube. For the same conditions, the boiling pressure is increased to 10 atm, estimate the heat transfer rate. (ii) (iii) Comment on the effect of pressure on the boiling heat transfer coefficient and heat transfer rate. 3.
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