Probem: A liquid at 293 K flow at a the rate of 0.7 kg/s in a glass pipe having a diameter of 64 mm. The liquid density is 1000 kg/m² with a viscosity of 2 cp. (a) Calculate the Reynolds number. Is this flow turbulent or laminar? (b) Calculate the flow rate needed in m³/s and velocity in m/s for a typical flow rate that is laminar. (Hint: Choose a Reynolds number within the laminar region.) Problem 2: Hot oil at a flow rate of 2.98 kg/s (c = 1.9 kJ/kg.K) enters an existing counterflow exchanger at 395 K and is cooled by water entering at 320 K (under pressure) and flowing at a rate of 0.68 kg/s. The overall U = 340 W/m².K and area A = 12.5 m². Calculate the heat-transfer rate and the exit oil temperature. (Hint: Use the concept of heat exchanger effectiveness factor.) Open Microsoft 365 (Office) 97
Probem: A liquid at 293 K flow at a the rate of 0.7 kg/s in a glass pipe having a diameter of 64 mm. The liquid density is 1000 kg/m² with a viscosity of 2 cp. (a) Calculate the Reynolds number. Is this flow turbulent or laminar? (b) Calculate the flow rate needed in m³/s and velocity in m/s for a typical flow rate that is laminar. (Hint: Choose a Reynolds number within the laminar region.) Problem 2: Hot oil at a flow rate of 2.98 kg/s (c = 1.9 kJ/kg.K) enters an existing counterflow exchanger at 395 K and is cooled by water entering at 320 K (under pressure) and flowing at a rate of 0.68 kg/s. The overall U = 340 W/m².K and area A = 12.5 m². Calculate the heat-transfer rate and the exit oil temperature. (Hint: Use the concept of heat exchanger effectiveness factor.) Open Microsoft 365 (Office) 97
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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Transcribed Image Text:Probem: A liquid at 293 K flow at a the rate of 0.7 kg/s in a
glass pipe having a diameter of 64 mm. The liquid density is
1000 kg/m² with a viscosity of 2 cp.
(a) Calculate the Reynolds number. Is this flow turbulent or
laminar?
(b) Calculate the flow rate needed in m³/s and velocity in m/s
for a typical flow rate that is laminar. (Hint: Choose a
Reynolds number within the laminar region.)
Problem 2: Hot oil at a flow rate of 2.98 kg/s (c = 1.9 kJ/kg.K)
enters an existing counterflow exchanger at 395 K and is cooled
by water entering at 320 K (under pressure) and flowing at a rate
of 0.68 kg/s. The overall U = 340 W/m².K and area A = 12.5 m².
Calculate the heat-transfer rate and the exit oil temperature.
(Hint: Use the concept of heat exchanger effectiveness factor.)
Open Microsoft 365 (Office)
97
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