Heat Exchange Cfd

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  • Topic: Fluid dynamics, Computational fluid dynamics, Shell and tube heat exchanger
  • Pages : 33 (4888 words )
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  • Published : October 9, 2012
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CFD SIMULATION OF HEAT TRANSFER IN SHELL AND TUBE HEAT
EXCHANGER

KHAIRUN HASMADI OTHMAN

A t hesis submitted in fulfillment for the award of the Degree of Bachelor in Che mical Engineering (Gas Technology)

Faculty of Che mical and Natural Resources Engineering
Universiti Malaysia Pahang

APRIL 2009

i

ABSTRACT

Computational Fluid Dynamic (CFD) is a useful tool in solving and analyzing problems that involve fluid flows, while shell and tube heat exchanger is the most common type of heat exchanger and widely use in oil refinery and other large chemical processes because it suite for high pressure application. The processes in solving the s imulation consist of modeling and meshing the basic geometry of shell and tube heat exchanger using the CFD package Gambit 2.4. Then, the boundary condition will b e set before been simulate in Fluent 6.2 based on the experimental parameters. Parameter that had been used was the same parameter of experimental at constant mass flow rate of cold water and varies with mass flow rate at 0.0151 kg/s, 0.0161 kg/s and 0.0168 kg/s of hot water. Thus, this paper presents the simulation of heat transfer in shell and tube heat exchanger model and validation to heat transfer in Shell and Tube Heat Exchanger Studies Unit (Model HE 667) that been used in UMP’s chemical engineering laboratory. The CFD model is validated by comparison to the experimental results within 15% error.

ii

ABSTRAK

Computational Fluid Dynamic (CFD) merupakan perisian yg sangat berguna dalam menylesaikan dan menganalisa masalah yang melibatkan aliran bendalir, manakala ‘shell and tube heat exchanger’ merupakan jenis heat exchanger yang paling kerap digunakan di kilang pemprosesan minyak dan pemprosesan bahan kimia yang besar kerana sesuai digunakan untuk applikasi pada tekanan tinggi. Proses yang terlibat dalam menyelesaikan simulasi ini melibatkan ‘modeling’ dan ‘meshing’ geometri utama ‘shell and tube heat exchanger’ dengan menggunakan pakej CFD- Gambit 2.4. Kemudian, pebolehubah yang digunakan ditetapkan di dalam pakej Gambit sebelum diekspot ke pakej Fluent berdasarkan pembulehubah yang sama digunakan di dalam eksperimen. Pembolehubah yang digunakan ialah pembolehubah air sejuk yang malar dan air sejuk dimanupulasikan pada 0.0151 kg/s, 0.0161 kg/s dan 0.0168 kg/s. M aka, kertas kerja ini membentangkan mengenai simulasi pemindahan haba di dalam Shell and Tube Heat Exchanger Studies Unit (Model HE 667) yang digunakan di makmal kejuruteraan kimia UMP. Model CFD ini akan disahkan dengan membandingkan dengan keputusan eksperimen dalam lingkungan 15% ralat.

iii

TABLE OF CONTENTS

CHAPTER

TITLE

PAGE

ABSTRACT
ABSTRAK

ii

TABLE OF CONTENTS

iii

LIST OF TABLES

vi

LIST OF FIGURES

vii

LIST OF SYMBOLS

1

i

ix

INTRODUCTION

1

1.1

Background of study
1.1.1 Shell and Tube Heat Exchanger

1

1.1.2 Design of Shell and Tube Heat Exchanger

2

1.1.3 Heat Transfer

2

1.1.4 Computational Fluid Dynamics

3

1.1.5 Fluent

5

1.2

Problem Statement

7

1.3

Objective

7

1.4

Scopes of Research Project

7

iv
LITERATURE REVIEW

8

2.1

Introduction

8

2.2

Computational Fluid Dynamics (CFD)

8

2.2.1 Definition

9

2.2.2 History

9

2.2.3 Simulation on Heat Transfer

11

2.2.4 Simulation Improving Efficiency

14

2.2.5 Graphical Portrait of Flow

16

Heat Exchanger Simulation

18

2.3.1 Tube and Finned Heat Exchanger

18

2.3.2 The Helical Ba ffle

2

20

2.3

2.3.3 Finned Tube and Unbaffled Shell
and Tube Heat Exchanger

22

2.3.4 Tube in Tube Heat Exchanger
2.4

Steam Properties

25

2.5

3

23

Geometrical Description

25

M ETHODOLOGY

27

3.1

Introduction

27

3.2

Overall of Research Methodology

27

3.2.1 Experimental (HE 667)

29

3.2.1.1 Experimental Start- up Procedures

31

3.2.1.2 Experimental Procedure

31...
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