Aspect-ratio dependence of the Nusselt number and boundary layer properties in Rayleigh-Bénard turbulent convection.

• Other Authors: Cheung, Yin Har.
• Format: Others
• Language: English; Chinese
• Published: 2005
• Subjects: Rayleigh-Bénard convection; Nusselt number; Turbulent boundary layer
• Online Access: http://library.cuhk.edu.hk/record=b5896446; http://repository.lib.cuhk.edu.hk/en/item/cuhk-325457

Cheung Yin Har = 瑞利-柏納德湍流對流中Nusselt與縱橫比的關係以及邊界層性質的研究 / 張燕霞. === Thesis submitted in: October 2004. === Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. === Includes bibliographical references (leaves 115-119). === Text in English; abstracts in English and Chinese. === Cheung Yin Har = Ruili-Bonade tuan liu dui liu zhong Nusselt yu zong heng bi de guan xi yi ji bian jie ceng xing zhi de yan jiu / Zhang Yanxia. === Abstract --- p.i === 摘要 --- p.iii === Acknowledgments --- p.iv === Contents --- p.v === List of Figures --- p.vii === List of Tables --- p.x === Chapter Chapter 1 --- Introduction --- p.1 === Chapter 1.1 --- Background of turbulence --- p.1 === Chapter 1.2 --- Rayleigh-Benard convection --- p.3 === Chapter 1.3 --- Theoretical background --- p.4 === Chapter 1.3.1 --- The convection equations --- p.4 === Chapter 1.3.2 --- Characteristic parameters --- p.6 === Chapter 1.3.3 --- Reynolds equations --- p.8 === Chapter 1.4 --- Recent developments --- p.10 === Chapter 1.4.1 --- Heat transport --- p.10 === Chapter 1.4.2 --- Large scale flow and thermal plumes --- p.11 === Chapter 1.4.3 --- Boundary layers --- p.12 === Chapter 1.5 --- Motivation --- p.14 === Chapter 1.5.1 --- Nusselt measurements --- p.14 === Chapter 1.5.2 --- Boundary layer properties measurements --- p.14 === Chapter 1.6 --- Synopsis of this thesis --- p.15 === Chapter Chapter 2 --- Experimental setup and measurement techniques --- p.17 === Chapter 2.1 --- The turbulent convection system --- p.17 === Chapter 2.1.1 --- The convection cells --- p.18 === Chapter 2.1.2 --- The temperature probe --- p.21 === Chapter 2.1.3 --- The thermistors --- p.23 === Chapter 2.2 --- Particle Image Velocimetry (PIV) --- p.25 === Chapter 2.2.1 --- Image capture system --- p.27 === Chapter 2.2.2 --- Image analysis system --- p.36 === Chapter Chapter 3 --- Aspect ratio dependence of heat transport and the flow field --- p.39 === Chapter 3.1 --- Motivation for this experiment --- p.39 === Chapter 3.2 --- Heat transfer efficiency measurements --- p.40 === Chapter 3.3 --- Heat correction --- p.44 === Chapter 3.3.1 --- Temperature correction --- p.44 === Chapter 3.3.2 --- Heat current density J correction --- p.45 === Chapter 3.3.3 --- Finite conductivity of plate --- p.50 === Chapter 3.4 --- Aspect ratio dependence --- p.51 === Chapter 3.4.1 --- Without correction of finite conductivity --- p.51 === Chapter 3.4.2 --- With correction of finite conductivity --- p.59 === Chapter 3.5 --- Time-averaged velocity field --- p.65 === Chapter 3.6 --- Summary --- p.70 === Chapter Chapter 4 --- Local temperature and velocity measurements near the boundary layers --- p.71 === Chapter 4.1 --- Motivation for this experiment --- p.71 === Chapter 4.2 --- Temperature profile measurement --- p.72 === Chapter 4.2.1 --- Temperature and fluctuation profiles --- p.73 === Chapter 4.2.2 --- Thermal boundary thickness --- p.77 === Chapter 4.2.3 --- Temperature time series --- p.79 === Chapter 4.2.4 --- PDF --- p.83 === Chapter 4.3 --- Velocity profile measurement --- p.86 === Chapter 4.3.1 --- 2D velocity and fluctuation profiles --- p.86 === Chapter 4.3.2 --- Scaling properties --- p.93 === Chapter 4.4 --- Shear stress --- p.98 === Chapter 4.4.1 --- Viscous and Reynolds stresses --- p.99 === Chapter 4.4.2 --- Laminar or Turbulent? --- p.101 === Chapter 4.5 --- Summary --- p.104 === Chapter Chapter 5 --- Conclusion --- p.106 === Chapter 5.1 --- Heat flux measurement --- p.106 === Chapter 5.2 --- Boundary layers --- p.107 === Chapter 5.3 --- Perspective for further investigation --- p.108 === Appendix A Heat flux measurement for high Prandtl number --- p.109 === Chapter I. --- Experimental conditions --- p.110 === Chapter II. --- Result and discussion --- p.112 === Chapter III. --- Summary and perspective for further investigation --- p.114 === Bibliography --- p.115