A round tube (ID = 60mm, OD = 80mm) carrying liquid ammonia has a constant surface temperature of −50°C. The tube has 8mm thick insulation on it. A large fan on the production floor pushes air across the tube at about2 ? ? . What is the convection coefficient across the insulated tube? ShapeFluidRange of ReNusselt NumberGas or Liquid1Cylinder0.4 - 4Nu = 0.989 Re:33 P34 – 40Nu = 0.911 Re385 p340 – 4,000Nu = 0.9683 Re466 p3r4,000 – 40,000Nu = 0.193 Re-618 p340,000 – 400,000Nu = 0. 027Re:805 p3Square ("D" is one side)Gas3,900-79,000Nu = 0.094Re-675Square, Tilted 45° (“D" is pointto point)Gas5,600-111,000Nu = 0. 258Re:588,Hexagon (“D" is Width of theflats)Gas4,500-90,700Nu = 0.148RE:638 p31Hexagon, Tilted 45° (“D" ispoint to point)Gas5,200-20,400Nu = 0. 162Re:638,20,400-105,000Nu = 0.039Re:782 p3Vertical Plate (“D" is theheight)Gas6,300-23,600Nu = 0. 257Re:731)Ellipse ("D" is the short width)Gas1,400-8,200Nu = 0.197Re:612 i MaterialDensitySpecificLatent HeatLatent HeatThermalHeat (or)(kgof Fusion,ofConductivityWkgK,Vaporizationkg\mK)Air1.2257180.025Aluminum2712900396000200Ammonia68244001371000(Liquid)Cast Iron7300460247000408940390СopperЕроху206000400120010001.5G1018006700.3FiberglassGlass22007501Silicone107013000.2Steel785045024700020

Given, Density of air, ρ = 1.225 kg/m3 Inner diameter of the insulation, D = 80 mm +2×8 mm= 96×1…

Answered: A round tube (ID = 60mm, OD = 80mm)…

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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Question

A round tube (ID = 60mm, OD = 80mm) carrying liquid ammonia has a constant surface temperature of −50°C. The tube has 8mm thick insulation on it. A large fan on the production floor pushes air across the tube at about2 ? ? . What is the convection coefficient across the insulated tube?

Shape
Fluid
Range of Re
Nusselt Number
Gas or Liquid
1
Cylinder
0.4 - 4
Nu = 0.989 Re:33 P3
4 – 40
Nu = 0.911 Re385 p3
40 – 4,000
Nu = 0.9683 Re466 p3
r
4,000 – 40,000
Nu = 0.193 Re-618 p3
40,000 – 400,000
Nu = 0. 027Re:805 p3
Square ("D" is one side)
Gas
3,900-79,000
Nu = 0.094Re-675
Square, Tilted 45° (“D" is point
to point)
Gas
5,600-111,000
Nu = 0. 258Re:588,
Hexagon (“D" is Width of the
flats)
Gas
4,500-90,700
Nu = 0.148RE:638 p3
1
Hexagon, Tilted 45° (“D" is
point to point)
Gas
5,200-20,400
Nu = 0. 162Re:638,
20,400-105,000
Nu = 0.039Re:782 p3
Vertical Plate (“D" is the
height)
Gas
6,300-23,600
Nu = 0. 257Re:731)
Ellipse ("D" is the short width)
Gas
1,400-8,200
Nu = 0.197Re:612 i

Material
Density
Specific
Latent Heat
Latent Heat
Thermal
Heat (or)
(kg
of Fusion,
of
Conductivity
W
kgK,
Vaporization
kg
\mK)
Air
1.225
718
0.025
Aluminum
2712
900
396000
200
Ammonia
682
4400
1371000
(Liquid)
Cast Iron
7300
460
247000
40
8940
390
Сopper
Ероху
206000
400
1200
1000
1.5
G10
1800
670
0.3
Fiberglass
Glass
2200
750
1
Silicone
1070
1300
0.2
Steel
7850
450
247000
20

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