Answered: cm Hot air Lütfen birini seçin: O A.…

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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Question

A rectangular duct shown in the figure is carrying hot air at temperature of 50 °C and is subjected to a 10 °C quiescent air environment from its outer surface. The duct material is thin and is highly conductive. The duct is placed in between a low conductive material from the sides and heat loss occurs only from top and bottom surfaces. What is the heat loss to the quiescent air for a unit length of the duct? Approximate the characteristic length as half of the duct wide. Take physical properties of air as k = 0.025 W/mK, ν = 15x10^-6 m²/s, α = 23x10^-6 m²/s.

L = 50 cm
Hot air
g
Lütfen birini seçin:
O A.
81.91 W/m
O B. 116.56 W/m
O C. 47.26 W/m
O D. 163.82 W/m

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