a. Water at 20 °C with a mass flow rate of 1.0 kg/s enters an annulus formed by an inner pipe having an OD of 2.5 cm and an outer pipe having an ID of 10 cm. The wall temperature of the inner pipe varies from 80 °C at the inlet to 100 °C at the outlet. The outer surface of the outer pipe is well insulated. Calculate the length of the annulus required to heat the water to 75 °C.

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
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2. Present the proper Nu correlations for the following scenarios: (30)
a. Water at 20 °C with a mass flow rate of 1.0 kg/s enters an annulus formed by an inner pipe
having an OD of 2.5 cm and an outer pipe having an ID of 10 cm. The wall temperature of the
inner pipe varies from 80 °C at the inlet to 100 °C at the outlet. The outer surface of the outer
pipe is well insulated. Calculate the length of the annulus required to heat the water to 75 °C.
Transcribed Image Text:2. Present the proper Nu correlations for the following scenarios: (30) a. Water at 20 °C with a mass flow rate of 1.0 kg/s enters an annulus formed by an inner pipe having an OD of 2.5 cm and an outer pipe having an ID of 10 cm. The wall temperature of the inner pipe varies from 80 °C at the inlet to 100 °C at the outlet. The outer surface of the outer pipe is well insulated. Calculate the length of the annulus required to heat the water to 75 °C.
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