Song Hao = 湍流熱對流中的熱傳導測量 / 宋浩. / Thesis submitted in: December 2004. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 65-70). / Text in English; abstracts in English and Chinese. / Song Hao = Tuan liu re dui liu zhong de re zhuan dao ce liang / Song Hao. / Abstract (in English) --- p.i / Abstract (in Chinese) --- p.ii / Acknowledgements --- p.iii / Table of Contents --- p.iv / List of Figures --- p.vi / List of Tables --- p.ix / Chapters / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Experimental Setup and Methods --- p.7 / Chapter 2.1 --- The rough boundary cell / Chapter 2.1.1 --- Convection Cell --- p.7 / Chapter 2.1.2 --- Temperature Probes --- p.9 / Chapter 2.1.3 --- Working Fluids --- p.10 / Chapter 2.1.4 --- Temperature-stabilized Box --- p.12 / Chapter 2.2 --- Rectangular and Square Cell --- p.13 / Chapter 2.3 --- The Big Cell --- p.13 / Chapter 2.4 --- The Thermal Measurements --- p.16 / Chapter 3. --- Nusselt Number Measurement in the Rough Boundary Cell --- p.19 / Chapter 3.1 --- Nu correction --- p.19 / Chapter 3.2 --- Non-Boussinesq Effect --- p.25 / Chapter 3.3 --- Experimental Results --- p.28 / Chapter 3.3.1 --- Water --- p.28 / Chapter 3.3.2 --- 1-Pentonal --- p.29 / Chapter 3.3.3 --- Dipropylene Glycol --- p.30 / Chapter 3.3.4 --- Triethylene Glycol --- p.32 / Chapter 3.4 --- Discussion on the Results --- p.34 / Chapter 3.4.1 --- Nusselt number --- p.34 / Chapter 3.4.2 --- Comparison with the smooth cell --- p.35 / Chapter 3.4.3 --- Normalized Nusselt number enhancement --- p.37 / Chapter 3.4.4 --- Nu~Pr-Relation --- p.40 / Chapter 3.4.5 --- Effects of Roughness Size --- p.43 / Chapter 3.4.6 --- Temperature Fluctuation Measurement --- p.44 / Chapter 4. --- Geometry Dependence of Nusselt Number and Temperature Fluctuation --- p.47 / Chapter 4.1 --- Nusselt Number Measurement --- p.48 / Chapter 4.2 --- Temperature Fluctuation's Dependence on Geometry --- p.50 / Chapter 5. --- Nusselt Number in the Big Cell --- p.53 / Chapter 5.1 --- The Big Cell --- p.53 / Chapter 5.2 --- Correction for Big Cell --- p.57 / Chapter 5.3 --- Results and Discussion --- p.61 / Chapter 6. --- Conclusions --- p.63 / References --- p.65

Xu, Xiaoqi. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 91-92). / Abstracts in English and Chinese. / Xu, Xiaoqi. / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Experimental measurements --- p.10 / Chapter 3 --- Review of earlier work --- p.13 / Chapter 3.1 --- Moments of {xP fT) --- p.13 / Chapter 3.2 --- Earlier results of Xr --- p.18 / Chapter 4 --- Probability Density Functions --- p.24 / Chapter 5 --- Scaling behavior of the moments --- p.43 / Chapter 5.1 --- Longest time scale in the problem --- p.43 / Chapter 5.2 --- The maximum order of the moment that can be calculated from a given set of data --- p.47 / Chapter 5.3 --- Moments of the surrogate XT --- p.50 / Chapter 5.4 --- The surrogate XT using water measurements and helium measurements --- p.59 / Chapter 5.4.1 --- PDFs comparison --- p.59 / Chapter 5.4.2 --- Scaling behavior of moments --- p.61 / Chapter 5.5 --- Investigation --- p.64 / Chapter 5.5.1 --- Helium measurements and water measurements --- p.64 / Chapter 5.5.2 --- Xr and Xfr using water measurements --- p.69 / Chapter 5.6 --- Conclusion --- p.73 / Chapter 6 --- Conditional statistics of temperature fluctuations --- p.74 / Chapter 6.1 --- Estimating the maximum order of moment --- p.74 / Chapter 6.2 --- Conditional temperature structure functions using Xfr and Xr --- p.78 / Chapter 6.3 --- Conditional temperature structure functions using x/r and XT at various r in the temperature derivatives --- p.83 / Chapter 7 --- Conclusion --- p.89 / Bibliography --- p.91

Cheng, Wai Chi = 利用殼模型對熱對流湍流的研究 / 鄭偉智. / "September 2007." / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 72-74). / Text in English; abstracts in English and Chinese. / Cheng, Wai Chi = Li yong qiao mo xing dui re dui liu tuan liu de yan jiu / Zheng Weizhi. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- What is turbulence? --- p.1 / Chapter 1.1.1 --- The governing equation --- p.1 / Chapter 1.1.2 --- Richardson cascade and the K41 theory --- p.2 / Chapter 1.2 --- Thermal turbulence --- p.4 / Chapter 1.2.1 --- Entropy cascade and the Bolgiano-0bukhov scaling --- p.5 / Chapter 1.2.2 --- Interesting issues in turbulent convection --- p.7 / Chapter 1.2.3 --- Shell model of turbulence --- p.8 / Chapter 1.3 --- Motivations and structure of thesis --- p.11 / Chapter 2 --- Different scaling behavior in different shell models of turbulent convection --- p.13 / Chapter 2.1 --- Introduction --- p.13 / Chapter 2.1.1 --- Model dependence of scaling behavior --- p.15 / Chapter 2.1.2 --- Bolgiano scale and the dynamical significance of buoyancy --- p.26 / Chapter 2.2 --- Summary --- p.34 / Chapter 3 --- Scaling behavior in Brandenburg's model --- p.35 / Chapter 3.1 --- Introduction --- p.35 / Chapter 3.2 --- Scaling behavior in Brandenburg's model with different forcing mechanisms and parameters --- p.36 / Chapter 3.3 --- Summary --- p.43 / Chapter 4 --- Understanding the scaling behavior in Brandenburg's model --- p.45 / Chapter 4.1 --- Introduction --- p.45 / Chapter 4.2 --- Theory --- p.46 / Chapter 4.3 --- Summary --- p.48 / Chapter 5 --- Testing our theory against numerical results --- p.49 / Chapter 5.1 --- Introduction --- p.49 / Chapter 5.2 --- Testing of the hierarchical structure --- p.49 / Chapter 5.3 --- "Testing ζp, and тp with our prediction" --- p.52 / Chapter 5.4 --- Scaling behavior with fixed entropy transfer rate --- p.55 / Chapter 5.5 --- Summary --- p.57 / Chapter 6 --- Distinguishing feature for active and passive scalars --- p.59 / Chapter 6.1 --- Introduction --- p.59 / Chapter 6.2 --- Distinguishing feature of active and passive scalar --- p.60 / Chapter 6.3 --- Scaling behavior of the auxiliary scalar --- p.66 / Chapter 6.4 --- Summary --- p.69 / Chapter 7 --- Conclusion --- p.70 / Bibliography --- p.72 / A Constraint equations on the parameters in the extended GOY model --- p.75

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Natural convection provides a means for circulating fluids without the use of pumps. This type of system is of great interest for a wide variety of applications, including solar heaters, process industry, and nuclear reactors. Natural convection will play a vital role in the area of passive safety and reliability, particularly for the development of Generation IV nuclear energy systems. This study mainly focuses on the linear stability analysis of asymmetrically heated/cooled natural convection loops with large temperature variations across the heated core. The study targets the Argonne Lead Loop Facility (ALLF), a concept for an experiment loop to support the development of the Secure Transportable Autonomous Reactor-Liquid Metal (STAR-LM) at Argonne National Laboratory, using lead-bismuth eutectic (LBE) as the primary reactor coolant. A one-dimensional linear stability analysis is performed and the Nyquist criterion is employed to find the linear stability boundary of both forward and backward circulations. It was found that the natural circulations could be linearly unstable in a high Reynolds number region. Increasing loop friction makes a forward circulation more stable, but destabilizes the corresponding backward circulation under the same heating/cooling conditions. The preliminary results suggest that as the Peclet number decreases, the forward circulation is prone to become unstable while the backward circulation is prone to remain stable. / Graduation date: 2003

Heat transfer and fluid mechanical behavior of water flowing horizontally in vertically-narrow rectangular channels was studied in this work. Friction factor and Nusselt number variations were determined experimentally for four different wall heating conditions, and for aspect ratios(height to width) of 5, 4, 3, 2, and 1. Wall heating conditions examined were: all surfaces heated; three surfaces heated, the top adiabatic; one side surface heated the others adiabatic; and the bottom surface heated, the others adiabatic. Friction factors, in laminar flow, varied as predicted from analysis. The critical Reynolds number varied linearly with 1n(D[subscript]). Local Nusselt numbers were determined, at each aspect ratio and heating condition, as functions of Reynolds and Rayleigh numbers. Mixed convection was the result of buoyancy-induced secondary flows. Local Nusselt numbers decreased in a manner common to pure forced convection, reaching minimum values some distance from the entrance, then increased due to the presence of the secondary flows. For given aspect ratio, local Nusselt numbers were found to increase and the thermal entrance lengths decreased, with increasing Rayleigh numbers. In the thermal entry region, for all heating conditions except the bottom-heating case, local Nusselt number behavior showed minor dependence on aspect ratio. / Graduation date: 1999

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