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Q5:Air flows inside pipe 12 cm diameter with mass flow 1.5 kg/min. 1-Is flow laminar or turbulent? 2-Determine the pressure gradient ,friction coefficent (C). Air propereties are: Cp-1010 J/kg.K,k-0.030 W/mK, factor (f) and friction μ-0.2x104 N.s/m², Pr-0.7 and p-1.12 kg/m³. 06:4

Q5:Air flows inside pipe 12 cm diameter with mass flow 1.5 kg/min. 1-Is flow laminar or turbulent? 2-Determine the pressure gradient ,friction coefficent (C). Air propereties are: Cp-1010 J/kg.K,k-0.030 W/mK, factor (f) and friction μ-0.2x104 N.s/m², Pr-0.7 and p-1.12 kg/m³. 06:4

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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Q5:Air flows inside pipe 12 cm diameter with mass flow 1.5 kg/min. 1-Is flow laminar or turbulent? 2-Determine the pressure gradient ,friction factor (f) and friction coefficent (C₂). Air propereties are: Cp-1010 J/kg.K,k-0.030 W/mK, μ-0.2x104 N.s/m², Pr-0.7 and p-1.12 kg/m³. Q6:A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine with constant heat flux. The flow rate of cooling water through the inner tube (Di =25 mm) is 0.2 kg/s, while the flow rate of oil through the outer annulus (Do = 45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. 1-How long must the tube be made if the outlet temperature of the oil is to be 60°C? 2-If the fouling resistance through the inner tube is 0.0012 m²K/W, How long must the tube be made if the outlet temperature of the oil is to be 60°C. Oil (Th=80°C = 353 K): Cp = 2131 J/kg K, u= 3.25 x 102 N s/m², k = 0.138 W/m KJ Water (T.- 35°C): Cp = 4178 J/kg = K, u= 725 10-N s/m², k = 0.625 W/m K, Pr = 4.85
Transcribed Image Text:Q5:Air flows inside pipe 12 cm diameter with mass flow 1.5 kg/min. 1-Is flow laminar or turbulent? 2-Determine the pressure gradient ,friction factor (f) and friction coefficent (C₂). Air propereties are: Cp-1010 J/kg.K,k-0.030 W/mK, μ-0.2x104 N.s/m², Pr-0.7 and p-1.12 kg/m³. Q6:A counterflow, concentric tube heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine with constant heat flux. The flow rate of cooling water through the inner tube (Di =25 mm) is 0.2 kg/s, while the flow rate of oil through the outer annulus (Do = 45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100 and 30°C, respectively. 1-How long must the tube be made if the outlet temperature of the oil is to be 60°C? 2-If the fouling resistance through the inner tube is 0.0012 m²K/W, How long must the tube be made if the outlet temperature of the oil is to be 60°C. Oil (Th=80°C = 353 K): Cp = 2131 J/kg K, u= 3.25 x 102 N s/m², k = 0.138 W/m KJ Water (T.- 35°C): Cp = 4178 J/kg = K, u= 725 10-N s/m², k = 0.625 W/m K, Pr = 4.85
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