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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?

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?

Introduction to Chemical Engineering Thermodynamics
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
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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
Transcribed Image Text: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
Transcribed Image Text: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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