5. . . ) In a manufacturing process, a long, coated plastic rod (p = 2200 kg/m³, c = 800 J/kg K, k =20 W/m K) of diameter D = 20 mm is initially at a uniform tempera- ture of 25°C and is suddenly exposed to a cross flow of air at T.. 350°C and V = 50 m/s. = (a) How long will it take for the surface of the rod to reach 175°C, the temperature above which the special coating will cure? h Additional hint: Bi = Lc. The k characteristic Lc is defined as V / As, or the ratio between Volume and Surface area. For cylinder, V = 1 D² * Length As = 4 πD * Length.
5. . . ) In a manufacturing process, a long, coated plastic rod (p = 2200 kg/m³, c = 800 J/kg K, k =20 W/m K) of diameter D = 20 mm is initially at a uniform tempera- ture of 25°C and is suddenly exposed to a cross flow of air at T.. 350°C and V = 50 m/s. = (a) How long will it take for the surface of the rod to reach 175°C, the temperature above which the special coating will cure? h Additional hint: Bi = Lc. The k characteristic Lc is defined as V / As, or the ratio between Volume and Surface area. For cylinder, V = 1 D² * Length As = 4 πD * Length.
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
Related questions
Question
Transcribed Image Text:5.
.
.
) In a manufacturing process, a long, coated plastic rod
(p = 2200 kg/m³, c = 800 J/kg K, k =20 W/m K) of
diameter D = 20 mm is initially at a uniform tempera-
ture of 25°C and is suddenly exposed to a cross flow of
air at T..
350°C and V = 50 m/s.
=
(a) How long will it take for the surface of the rod to
reach 175°C, the temperature above which the
special coating will cure?
h
Additional hint: Bi = Lc. The
k
characteristic Lc is defined as V / As, or the
ratio between Volume and Surface area.
For cylinder,
V = 1 D² * Length
As
=
4
πD * Length.
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