Air jet impingement onto a water layer over a flat plate

다국어 초록 (Multilingual Abstract)

Several cleaning steps are needed while an LCD panel is manufactured. After finishing these cleaning steps, the panel must be completely dried off without any contamination and damage. An air jet impingement system is the best way to blow off the water from the panel surface and make the panel completely dry. But the different operating conditions such as nozzle pressure ratio, nozzle inlet temperature, etc. have a great influence on the air jet impingement system. Due to no study on air jet impinging onto a water layer over a flat plate, two-dimensional axisymmetric numerical simulations were carried out. A convergent nozzle with an inlet diameter of 50 mm and exit diameter of 10 mm was used to produce a supersonic jet flow. The Volume of Fluid (VOF) model and one equation turbulence model were considered to simulate this flowfield. The air jet impingement without water layer and with water layer was studied. X- density, pressure, Mach number, and velocity contour were shown to understand the air jet impingement on a flat plate. Volume fraction contour, stagnation pressure, and temperature plot were obtained to find the optimum way to remove the water from the plate.

목차 (Table of Contents)

• CHAPTER 1: INTRODUCTION 1
• 1.1 Research Background 1
• 1.2 Motivation 2
• 1.3 Engineering Applications 3
• CHAPTER 2: LITERATURE SURVERY 5
• 2.1 Previous Studies 5
• 2.2 Aim and Objectives 8
• CHAPTER 3: COMPUTATIONAL ANALYSIS 9
• 3.1 Governing Equations 9
• 3.2 Turbulence Model 11
• 3.3 Geometry and Dimension 12
• 3.4 Boundary Conditions 13
• 3.5 Numerical Schme 15
• 3.6 Grid and Turbulence Model Study 16
• CHAPTER 4: RESULT AND DISCUSSION 19
• 4.1 Verification and Validation 19
• 4.2 Jet Impingement without water layer 21
• 4.3 Jet Impingement with water layer 26
• 4.3.1 Structure of water layer deformation 27
• 4.3.2 Effect of nozzle pressure ratio 29
• 4.3.3 Effect of nozzle inlet temperature 32
• 4.3.4 Effect of nozzle exit t plate distance 35
• 4.3.5 Effect of water layer thickness 38
• CONCLUSION 40
• REFERENCES 41