Experimental investigation of the velocity field in turbulent convection =: 湍流状态下对流速度场的实验硏究.

• Other Authors: Xin, Yongbao.
• Format: Others
• Language: English
• Published: Chinese University of Hong Kong 1996
• Subjects: Turbulent boundary layer
• Online Access: http://library.cuhk.edu.hk/record=b5888837; http://repository.lib.cuhk.edu.hk/en/item/cuhk-321585

by Yongbao Xin. === Thesis (Ph.D.)--Chinese University of Hong Kong, 1996. === Includes bibliographical references (leaves 113-117). === by Yongbao Xin. === ABSTRACT --- p.I === ACKNOWLEDGMENTS --- p.II === LIST OF FIGURES --- p.V === LIST OF TABLES --- p.VIII === CHAPTERS === Chapter 1. --- INTRODUCTION --- p.1 === Chapter 1.1 --- Turbulence: A Long-standing and Unsolved Problem --- p.1 === Chapter 1.2 --- Rayleigh-Benard Convection --- p.3 === Chapter 1.3 --- High Rayleigh Number Rayleigh-Benard Convection --- p.5 === Chapter 1.3.1 --- The Rayleigh number dependence of Nu --- p.6 === Chapter 1.3.2 --- Large-scale flow in RB convection --- p.7 === Chapter 1.3.3 --- Thermal plumes in the high Ra convection --- p.9 === Chapter 1.4 --- Velocity Field and Viscous Boundary Layer Measurement in Rayleigh-Benard Convection --- p.11 === Chapter 2. --- SETUP OF RAYLEIGH-BENARD CONVECTION --- p.14 === Chapter 2.1 --- The Convection Cells --- p.14 === Chapter 2.2 --- Built Up the Convection --- p.18 === Chapter 2.2.1 --- Preparations of fluid --- p.18 === Chapter 2.2.2 --- Procedures to have a stable convective state --- p.19 === Chapter 2.3 --- Measurements of the Nusselt Number --- p.22 === Chapter 3. --- VELOCITY MEASUREMENT IN RAYLEIGH-BENARD CONVECTION --- p.25 === Chapter 3.1 --- Dual-beam Incoherent Cross-correlation Spectroscopy --- p.25 === Chapter 3.1.1 --- Theory of the technique --- p.25 === Chapter 3.1.2 --- Experimental setup --- p.31 === Chapter 3.1.3 --- Calibration and applications of the technique --- p.34 === Chapter 3.1.4 --- Summary --- p.41 === Chapter 3.2 --- Velocity Measurement in Turbulent Rayleigh-Benard Convection --- p.42 === Chapter 3.2.1 --- Cross-correlation functions in turbulent convection --- p.42 === Chapter 3.2.2 --- Some experimental details --- p.43 === Chapter 3.2.3 --- Some issues to be concerned in the velocity measurement --- p.47 === Chapter 4. --- LARGE SCALE CIRCULATION IN RAYLEIGH-BENARD CONVECTION --- p.50 === Chapter 4.1 --- Large Scale Circulation in Cylindrical Cells --- p.50 === Chapter 4.1.1 --- "Large scale circulation in cells of AR =1,2，and 44" --- p.50 === Chapter 4.1.2 --- Flow pattern in AR = 0.5 cell --- p.55 === Chapter 4.1.3 --- Velocity profiles along vertical central axis --- p.57 === Chapter 4.1.4 --- Prandtl number dependence of the boundary layer properties --- p.61 === Chapter 4.2 --- Large Scale Circulation in Cubic Cell --- p.65 === Chapter 4.2.1 --- Large scale flows near the plate and near the sidewall --- p.65 === Chapter 4.2.2 --- Velocity profiles along the vertical axis --- p.68 === Chapter 4.3 --- Summary --- p.73 === Chapter 5. --- SCALING PROPERTIES OF THE BOUNDARY LAYER QUANTITIES --- p.75 === Chapter 5.1 --- Ra Dependence of Boundary Layer Properties --- p.75 === Chapter 5.1.1 --- Scaled velocity and standard deviation profiles at different Ra --- p.75 === Chapter 5.1.2 --- Scaling properties of the maximum mean velocityvm and the maximum standard deviation σm --- p.76 === Chapter 5.1.3 --- Scaling properties of the shear rate γv and the gradient of the standard deviation yσ --- p.80 === Chapter 5.1.4 --- Scaling properties of boundary layer thickness --- p.84 === Chapter 5.2 --- Aspect-ratio Dependence of Boundary Layer Properties --- p.87 === Chapter 5.2.1 --- AR dependence of vm(Ra) and σm(Ra) --- p.87 === Chapter 5.2.2 --- AR dependence of the shear rate --- p.89 === Chapter 5.2.3 --- AR dependence of the viscous boundary layer thickness --- p.89 === Chapter 5.2.4 --- Vertical motion of the coherent structures in AR = 0.5 cell --- p.92 === Chapter 5.3 --- Summary --- p.93 === Chapter 6. --- CONCLUSION --- p.96 === APPENDIX === Chapter A1. --- NUMERICAL ANALYSIS OF THE CORRELATION FUNCTION EQ. 315 --- p.100 === Chapter A1.1 --- Analysis with Gaussian PDF Distribution --- p.100 === Chapter A1.2 --- Definition and Properties of Erfc(x) --- p.101 === Chapter A1.3 --- The Variable of Erfc in Eq. 315 --- p.104 === Chapter A1.4 --- Difference of Peak Position and t0 --- p.105 === Chapter A2. --- LASER HEATING EFFECTS IN THE LIGHT SCATTERING EXPERIMENT --- p.106 === Chapter A 2.1 --- Introduction --- p.106 === Chapter A 2.2 --- Experimental Technique --- p.106 === Chapter A 2.3 --- Results and Discussion --- p.108 === Chapter A 2.4 --- Summary --- p.109 === REFERENCES --- p.113