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Local heat flux measurement in Rayleigh-Benard convection. / 瑞利-伯纳德对流中的局域热传导的测量 / Local heat flux measurement in Rayleigh-Bénard convection. / Ruili-Bonade dui liu zhong de ju yu re chuan dao de ce liangJanuary 2004 (has links)
Xiao Yi-fei = 瑞利-伯纳德对流中的局域热传导的测量 / 肖毅腓. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 85-89). / Text in English; abstracts in English and Chinese. / Xiao Yi-fei = Ruili-Bonade dui liu zhong de ju yu re chuan dao de ce liang / Xiao Yifei. / Abstract (in Chinese) --- p.i / Abstract (in English) --- p.ii / Acknowledgements --- p.iii / Table of Contents --- p.iv / List of Figures --- p.vi / List of Tables --- p.xi / Chapter Chapter 1 --- Theory and Some Physical Picture in Raleigh-Benard convection --- p.1 / Chapter 1.1 --- Introduction --- p.1 / Chapter 1.2 --- Rayleigh-Benard Convection and its dominated element --- p.3 / Chapter 1.2.1 --- Free convection Equation --- p.3 / Chapter 1.2.2 --- Heat transfer equation in Experiment --- p.6 / Chapter 1.2.3 --- Physical Picture of Plumes --- p.8 / Chapter 1.2.4 --- Large Scale Structure and Plumes --- p.9 / Chapter Chapter 2 --- Experimental Setup and Instrumentation --- p.11 / Chapter 2.1 --- The convection Cell for the experiment --- p.11 / Chapter 2.2 --- Temperature probe and its calibration --- p.14 / Chapter 2.3 --- Principle of Wheatstone electrical Bridge --- p.17 / Chapter 2.4 --- The Principle of Laser Doppler Velocimetry (LDV) --- p.21 / Chapter 2.4.1 --- Features of LDV / Chapter 2.4.2 --- Measurement position in Simultaneous Measurement Velocity and Temperature --- p.25 / Chapter 2.4.3 --- Data analysis of LDV --- p.27 / Chapter Chapter 3 --- Measurement of Local Heat Flux --- p.31 / Chapter 3.1 --- Simultaneous measurement velocity in Different Distance --- p.31 / Chapter 3.2 --- Treatment of Heat Flux Signals --- p.40 / Chapter 3.2.1 --- Sampling Clock of Heat Flux --- p.40 / Chapter 3.2.1 --- Expanding j Relative to Mean wind and Local Fluctuation Term --- p.44 / Chapter 3.2.3 --- "Temperature, Velocity and Heat Flux's Corrections" --- p.46 / Chapter 3.3 --- Conclusions --- p.50 / Chapter Chapter 4 --- Result and Discussion --- p.51 / Chapter 4.1 --- Spatial structure of Heat Flux --- p.51 / Chapter 4.1.1 --- Ra-dependent Spatial Structure for Flow Along the LSC plane --- p.51 / Chapter 4.1.2 --- Ra-dependent Spatial Structure for Flow Perpendicular to the LSC plane --- p.58 / Chapter 4.1.3 --- Comparisons of Jz and Jzfluc --- p.62 / Chapter 4.2 --- Fluctuations of Local Heat Flux --- p.65 / Chapter 4.2.1 --- At Cell Center --- p.65 / Chapter 4.2.2 --- Near Sidewall --- p.70 / Chapter 4.3 --- Conclusions --- p.80 / Chapter Chapter 5 --- Conclusions and Future Work --- p.81 / Chapter 5.1 --- Conclusions --- p.81 / Chapter 5.2 --- Perspective for Further Investigation --- p.84 / Reference --- p.85 / List of Figures / Chapter 1.1 --- Typical temperature profile along z-direction (From lower plate to upper) --- p.7 / Chapter 2.1 --- Sketch of the convection cell for simultaneous measurement temperature and velocity --- p.12 / Chapter 2.2 --- The setup of temperature probe calibration --- p.15 / Chapter 2.3 --- A typical temperature calibrate Resistance vs. Temperature --- p.16 / Chapter 2.4 --- The Wheatstone bridge and the differential amplifier: R0=10.0 kΩ; R1=R2=R3=Rf=5.0 kΩ; Rv is used to balance the bridge --- p.18 / Chapter 2.5 --- Schematic diagram Principle of the LDV --- p.22 / Chapter 2.6 --- Measuring volume of Laser Doppler Velocimetry --- p.24 / Chapter 2.7 --- Velocity (m/s) vs. Transit Time (ms) --- p.28
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Experimental studies of Rayleigh-Bénard convection and horizontal convection. / 瑞利-伯納德對流及水平對流的實驗研究 / Experimental studies of Rayleigh-Bénard convection and horizontal convection. / Ruili-Bonade dui liu ji shui ping dui liu de shi yan yan jiuJanuary 2013 (has links)
本論文由兩部分組成。第一部分介紹了關於瑞利-伯纳德對流的兩項工作。第一項工作在五個側向寬高比不同的矩形對流槽中研究了空間約束效應對流體動力學和傳熱效率的影響。實驗發現,整體流場隨著約束強度的增加而明顯減弱,而且大尺度環流的流向反轉變得更為頻繁。令人驚訝的是,儘管流動變慢,總體傳熱效率卻顯著地提高。仔細分析表明,空間約束改變了邊界層中羽流的形態和動力學特性,表現為形成的羽流結構更為有序和充滿活力,從而導致邊界層變得更薄更均勻,傳熱效率由此得以提高。第二項工作研究了不同溫度邊界條件對湍流熱對流的影響。實驗在兩個對流槽中進行:其中一個在上邊界固定溫度而在下邊界固定熱通量(HC 對流槽),另一個則在兩個邊界都保持恆定溫度(CC對流槽)。研究發現,在恆定溫度的邊界條件下,溫度邊界層的厚度對瑞利數的依賴關係滿足于1/3的標度律,區別于在恆定熱通量下的行為(標度律近似為2/7)。此外,CC 對流槽中的流場強度平均比HC對流槽中的要強∼9% ,其流向反轉頻率也要快1.5倍。我們把這些現象歸咎於不同溫度邊界條件下羽流的發射強度不同。 / 論文的第二部分對另外一種重要的熱對流系統,水平對流,進行了實驗研究。在加熱和冷卻位于系統上邊界同一高度的條件下,我們觀測到了一個貫穿整個對流槽的大尺度環流。通過染料示蹤表明,流場中的迴流并不一定需要損耗能量來跨越溫度邊界層,因此可以更有效地維持其流動強度。對於熱傳輸效率以及溫度邊界層厚度隨瑞利數的變化關係,實驗觀測到了一個0.3的標度律,不同于經常被報道的理論值(0.2),這可能是因為在高瑞利數下流動狀態發生了轉變。本研究的结果表明,表面温度梯度不仅可以驱动大尺度环流,而且其強度也比人们普遍认为的要强。 / This thesis consists of two self-contained parts, both related to the topic of thermal convection. / In the first part, two sets of studies on turbulent Rayleigh-Bénard convection are presented. / The first study addresses the confinement effects on the heat transport and flow dynamics in quasi-2D geometry. The experiments were conducted in five rectangular cells with the same height and length, while the width being varied to produce a lateral aspect ratio Γ ranging from 0.6 to 0.1. As expected, with decreasing Γ, i.e. increasing the level of confinement, the overall flow slows down and more plumes travel through the bulk region, thus resulting in a large-scale circulation with more frequent reversals. Surprisingly, despite a slower flow, the global heat transport efficiency enhances significantly. Detailed examinations from experiment and simulation show that this enhancement is brought about by the changes in the dynamics and morphology of the thermal plumes in the boundary layers: the confined geometry produces more coherent and energetic plume clusters that in turn result in more uniform and thinner thermal boundary layers. This study demonstrates how changes in turbulent bulk flow can influence the boundary layer dynamics and shows that the quasi-2D geometry is very different from the true 2D and also the 3D systems. / The second study investigates the influence of thermal boundary conditions. Two experimentally achievable configurations are examined; one is fixed-flux at the bottom boundary and fixed-temperature at the top (HC cell), while the other is fixed-temperature at both boundaries (CC cell). It is found that, rather surprisingly, the Rayleigh number dependence of the thermal boundary layer thickness follows a 1/3 power law approximately under the condition of constant temperature, in contrast to the behavior in the case of constant flux (close to a 2/7 scaling). It is further found that the flow strength is on average ∼ 9% larger in the CC cell, and its flow reversal frequency is ∼ 1.5 faster than that for the HC case, which may be understood as changes in the plume emission dynamics. / The second part deals with horizontal convection. The experiment was conducted with a long apparatus (∼ 2.4 m) with the heating and cooling imposed over the top boundary. Flow visualization studies revealed a full penetrating circulation and suggest that the returning flow does not necessarily overcome the stratification to penetrate the entire thermal BL, in such a way that it can “save its kinematic energy thus supports the motion more efficiently. Both the heat transport efficiency and thermal BL thicknesses are found to follow a 0.3 power law, in contrast to the often-reported value of 0.2. This is likely caused by a flow-regime transition in the high Ra number range. This study demonstrates experimentally that a surface temperature gradient is capable of driving a large-scale circulation and its strength is much stronger than what is generally believed by the oceanography community. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Huang, Shidi = 瑞利-伯納德對流及水平對流的實驗研究 / 黃仕迪. / Thesis (Ph.D.) Chinese University of Hong Kong, 2013. / Includes bibliographical references (leaves 97-110). / Abstracts also in Chinese. / Huang, Shidi = Ruili-Bonade dui liu ji shui ping dui liu de shi yan yan jiu / Huang Shidi.
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Scaling and intermittency of velocity fluctuations in turbulent convection. / 湍流對流中速度漲落量之標度律與間歇性 / Scaling and intermittency of velocity fluctuations in turbulent convection. / Tuan liu dui liu zhong su du zhang luo liang zhi biao du lü yu jian xie xingJanuary 2004 (has links)
Leung Chun Kit = 湍流對流中速度漲落量之標度律與間歇性 / 梁振傑. / Thesis submitted in: 31st October, 2003. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 69-71). / Text in English; abstracts in English and Chinese. / Leung Chun Kit = Tuan liu dui liu zhong su du zhang luo liang zhi biao du lü yu jian xie xing / Liang Zhenjie. / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Rayleigh-Benard Convection Experiment --- p.6 / Chapter 2.1 --- Rayleigh-Benard convection --- p.6 / Chapter 2.2 --- Experimental measurements --- p.7 / Chapter 3 --- Probability Density Functions of Velocity Differences --- p.10 / Chapter 3.1 --- Important time scales --- p.11 / Chapter 3.2 --- PDF calculation --- p.13 / Chapter 3.3 --- Results --- p.14 / Chapter 4 --- Characterization of Velocity Intermittency --- p.23 / Chapter 4.1 --- SL hierarchy for the velocity fluctuations --- p.23 / Chapter 4.2 --- Checking SL hierarchy --- p.24 / Chapter 4.3 --- Results --- p.25 / Chapter 5 --- The Most Intense Velocity Structures --- p.45 / Chapter 5.1 --- The most intense velocity structures and the parameters a and b --- p.45 / Chapter 5.2 --- Estimating the parameters a and b --- p.46 / Chapter 5.3 --- Results --- p.47 / Chapter 5.4 --- Checking a conjecture --- p.63 / Chapter 6 --- Conclusion --- p.67 / Bibliography --- p.69
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Experimental investigation of high prandtl number turbulent convection. / 高普朗特數湍流對流的實驗硏究 / Experimental investigation of high prandtl number turbulent convection. / Gao pu lang te shu tuan liu dui liu de shi yan yan jiuJanuary 2000 (has links)
Lam Siu = 高普朗特數湍流對流的實驗硏究 / 林霄. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves 97-100). / Text in English; abstracts in English and Chinese. / Lam Siu = Gao pu lang te shu tuan liu dui liu de shi yan yan jiu / Lin Xiao. / 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 I. --- Introduction --- p.1 / Chapter II. --- Turbulent Rayleigh-Benard Convection --- p.5 / Chapter 2.1 --- Rayleigh-Benard Convection --- p.5 / Chapter 2.2 --- The Convection Equations --- p.6 / Chapter 2.3 --- The parameters --- p.7 / Chapter 2.4 --- Recent Developments --- p.9 / Chapter 2.4.1 --- Heat Transport --- p.9 / Chapter 2.4.2 --- Large-scale Circulation and thermal Plumes --- p.11 / Chapter 2.4.3 --- Boundary Layers --- p.12 / Chapter III. --- Experimental Setup and Methods --- p.15 / Chapter 3.1 --- The Apparatus --- p.15 / Chapter 3.2 --- The Working Fluids --- p.18 / Chapter 3.3 --- Thermal Measurements --- p.23 / Chapter 3.4 --- Flow Visualization --- p.26 / Chapter IV. --- Heat Transport in Turbulent Convection --- p.29 / Chapter 4.1 --- The Non-Boussinesq Effect --- p.30 / Chapter 4.2 --- Experimental Results --- p.34 / Chapter 4.2.1 --- 1-Pentanol --- p.35 / Chapter 4.2.2 --- Triethylene Glycol --- p.36 / Chapter 4.2.3 --- Results from Dipropylene Glycol --- p.37 / Chapter 4.3 --- Discussion on the Results --- p.38 / Chapter 4.4 --- Summary --- p.43 / Chapter V. --- Local Temperature Measurements --- p.45 / Chapter 5.1 --- Temperature Time Series and Histograms --- p.45 / Chapter 5.2 --- Mean Temperature Profiles and Thermal Boundary Layers --- p.55 / Chapter 5.3 --- RMS Profiles --- p.58 / Chapter 5.4 --- Skewness Profiles --- p.65 / Chapter 5.5 --- Summary --- p.68 / Chapter VI. --- Measurements on the Viscous Boundary Layers --- p.70 / Chapter 6.1 --- Power Spectrum --- p.70 / Chapter 6.2 --- Two-Probe Cross-correlation --- p.76 / Chapter 6.3 --- Laser Light Scattering --- p.84 / Chapter 6.4 --- Summary --- p.90 / Chapter VII --- . Conclusions --- p.93 / References --- p.97
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Conditional temperature structure functions in turbulent convection. / 對流湍流中條件溫度結構函數之硏究 / Conditional temperature structure functions in turbulent convection. / Dui liu tuan liu zhong tiao jian wen du jie gou han shu zhi yan jiuJanuary 2000 (has links)
Chau Kwok Leung = 對流湍流中條件溫度結構函數之硏究 / 周國良. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaves [93]-94). / Text in English; abstracts in English and Chinese. / Chau Kwok Leung = Dui liu tuan liu zhong tiao jian wen du jie gou han shu zhi yan jiu / Zhou Guoliang. / Abstract --- p.i / Abstract (Chinese Version) --- p.ii / Acknowledgement --- p.iii / Table of contents --- p.iv / List of figures --- p.v / List of tables --- p.xiii / Chapter 1 --- Introduction --- p.1 / Chapter 2 --- Rayleigh Benard experiments --- p.6 / Chapter 2.1 --- Rayleigh-Benard Experiment --- p.6 / Chapter 2.2 --- Rayleigh-Benard Convection using Helium --- p.8 / Chapter 2.3 --- Rayleigh-Benard Convection Experiment using water --- p.9 / Chapter 2.4 --- Passive Temperature Measurements in a Wind Tunnel Experiment --- p.10 / Chapter 3 --- Conditional Probability density function of the Temperature Differences --- p.11 / Chapter 3.1 --- Approximation of locally averaged temperature dissipation rate --- p.12 / Chapter 3.2 --- Conditional PDF for r < Tb --- p.14 / Chapter 3.3 --- Conditional PDF for r > Tb --- p.18 / Chapter 4 --- Conditional Statistics of Temperature Difference --- p.26 / Chapter 4.1 --- Distribution of In xT --- p.26 / Chapter 4.2 --- XT-dependence of 〈\TT\P\XT〉 --- p.28 / Chapter 4.2.1 --- Xr-dependence for small T --- p.28 / Chapter 4.2.2 --- XT dependence for large T --- p.31 / Chapter 4.3 --- "m(T,P)" --- p.39 / Chapter 4.4 --- Consequence of the Standard Gaussian Conditional PDF for T >Tb --- p.53 / Chapter 4.5 --- c(T,p) --- p.57 / Chapter 4.5.1 --- T>Tb --- p.60 / Chapter 4.5.2 --- T>Tb --- p.64 / Chapter 5 --- Height dependence of Conditional Temperature Structure Function --- p.69 / Chapter 5.1 --- Determination of rc and Td --- p.69 / Chapter 5.2 --- Height dependence of Conditional Temperature Structure Function --- p.72 / Chapter 6 --- Discussion --- p.78 / Chapter 6.1 --- Comparison with passive measurement --- p.78 / Chapter 6.2 --- Pr-dependence of Conditional PDF on XT --- p.87 / Chapter 7 --- Conclusion --- p.90 / Bibliography --- p.94
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Statistics and coherent structures in turbulent convection =: 對流湍流中統計及相干結構的硏究. / 對流湍流中統計及相干結構的硏究 / Statistics and coherent structures in turbulent convection =: Dui liu tuan liu zhong tong ji ji xiang gan jie gou de yan jiu. / Dui liu tuan liu zhong tong ji ji xiang gan jie gou de yan jiuJanuary 1998 (has links)
by Ma Kin Lok. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1998. / Includes bibliographical references (leaves 93-95). / Text in English; abstract also in Chinese. / by Ma Kin Lok. / Acknowledgements --- p.i / Abstract --- p.ii / Abstract (Chinese version) --- p.iv / Contents --- p.v / List of Figures --- p.vii / List of Tables --- p.ix / Chapter Chapter 1. --- Introduction --- p.1 / Chapter Chapter 2. --- Experimental setups and Coherent structures --- p.10 / Chapter 2.1 --- Experimental setup for turbulent convection using helium --- p.10 / Chapter 2.2 --- Experimental setup for turbulent convection using water --- p.12 / Chapter 2.3 --- Coherent structures in turbulent convection --- p.13 / Chapter Chapter 3. --- Statistics in turbulent convection --- p.16 / Chapter 3.1 --- Statistics versus Rayleigh number and height --- p.16 / Chapter 3.1.1 --- Time series of normalized temperature fluctuations --- p.17 / Chapter 3.1.2 --- PDF of normalized temperature fluctuations --- p.18 / Chapter 3.1.3 --- q(x) and r(x) --- p.21 / Chapter 3.2 --- Statistics versus height --- p.25 / Chapter 3.2.1 --- Time series of normalized temperature fluctuations --- p.25 / Chapter 3.2.2 --- PDF of normalized temperature fluctuations --- p.28 / Chapter 3.2.3 --- Skewness and flatness of normalized temperature fluctuations --- p.32 / Chapter 3.2.4 --- q(x) and r(x) --- p.33 / Chapter Chapter 4. --- Decomposition of the helium data --- p.40 / Chapter 4.1 --- Method of study for decomposition --- p.41 / Chapter 4.2 --- Effects of the decomposition on P(x) --- p.44 / Chapter 4.3 --- Modeling of coherent structures by average peaks --- p.46 / Chapter 4.4 --- The two conditional averages of the average peaks --- p.52 / Chapter 4.5 --- Effects of the peaks on PDF --- p.57 / Chapter Chapter 5. --- Statistics of Temperature Dissipation Rate --- p.62 / Chapter 5.1 --- She and Leveque's model for energy dissipation rate --- p.62 / Chapter 5.2 --- Limits of moments of temperature dissipation rate --- p.66 / Chapter 5.3 --- Scaling of moments of temperature dissipation rate --- p.68 / Chapter Chapter 6. --- Conclusions --- p.37 / Appendix A. The relation between Nu and λth --- p.89 / Appendix B. The algorithm of filtering the peaks --- p.90 / Appendix C. Effect of normalization on the conditional averages --- p.91 / Bibliography --- p.93
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Dynamics of the large-scale circulation in high prandtl number turbulent Rayleigh-Bénard convection. / 高普朗特數瑞利-伯納德對流中大尺度環流動力學特性研究 / Dynamics of the large-scale circulation in high prandtl number turbulent Rayleigh-Bénard convection. / Gao pu lang te shu Ruili-Bonade dui liu zhong da chi du huan liu dong li xue te xing yan jiuJanuary 2012 (has links)
自然界中存在很多的湍流熱對流現象。他們對於工業,科學與技術有著非常重要的影響。在本論文中我們利用多温度探头的技术研究了湍流熱對流的理想模型-湍流瑞利-伯納德對流中的大尺度環流在高普朗特數下的動力學特性。 / 實驗中,我们利用水和電子液體FC77 作為工作物質,獲得了普朗特數Pr 從5.3 到19.4. 瑞利數Ra 範圍8.3 × 10⁸ 2.94 × 10¹¹.我們用了一個寬高比Γ 為1 的圓柱形對流槽來研究大尺度環流的動力學特性。我們發現,在高普朗特數的時候,大尺度環流仍然是一個single roll. 這個與我們期望的是一樣的。大尺度環流的強度δ 的概率密度函數是一個高斯分佈。但是左邊的尾巴可以用一個指數函數來描述。我們也觀察到了大尺度環流傾向於呆在一個特定的角向位置。我們還發現,大尺度流動的角向運動具有擴散運動的特性。但是,用FC77 作為工作物質時,這個角向運動的擴散係數比用水作為工作物質時小兩個量級。實驗中測量到的雷諾數Re 和瑞利數Ra 之間的標度率與之前的實驗結果相符合。同時這個標度率也和Grossman-Lohse 模型的預測相符合。 / 大尺度流動豐富的動力學特性,比如說流動停止,流向反轉,扭轉還有平移振盪以及流動模式轉換,都可以在高普朗特數的時候觀察到。比較有趣的是我們發現流動停止在一個三維系統中既不依賴於Ra, 又不依賴於Pr. 這個結果和二維的瑞利-伯納德對流完全不同。 / Turbulent thermal convection is of tremendous importance to many areas of science, technology as well as the environment. In this thesis, the dynamics of the large-scale circulation (LSC) in turbulent Rayleigh-B´enard convection, which is an idealised model to study turbulent thermal convection problem, is investigated using the multi-thermal probe technique in the high Prandtl number Pr regime. / Using two kinds of working fluids, namely water and Fluorinert FC77, we achieved Pr from 5.3 to 19.4 and Rayleigh number Ra from 8.3×10⁸ to 2.94×10¹¹. The dynamics of the LSC is measured in an aspect ratio unity convection cell. It is found that the LSC in the high Pr regime is a single roll structure as expected. The probability distribution of the flow strength δ is a Gaussian distribution function with exponential tail to the left. The preferred orientation is also observed, which is revealed by the PDF of azimuthal orientation θ of the LSC. The azimuthal motion of the LSC is a diffusive process, which is the same as previous studies. However, we found that the diffusivity of the angular speed using FC77 as the working fluid is two orders smaller than using water as working fluid. The scaling of the measured Reynolds number Re number based on the oscillation frequency of the LSC with respect to Ra is in good agreement with previous experimental results and also Grossman-Lohse model prediction. / The abundant dynamical features of the LSC, such as cessations, flow reversals, torsional and sloshing oscillations and flow mode transitions are also observed in the high Pr regime. One surprising finding is that the cessation frequency of the LSC ,based on the statistics of the mid-height level of thermistors, is independent of both Ra and Pr, which is quite different from the (quasi) two-dimensional turbulent Rayleigh-B´enard convection. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Xie, Yichao = 高普朗特數瑞利-伯納德對流中大尺度環流動力學特性研究 / 謝毅超. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 53-57). / Abstracts also in Chinese. / Xie, Yichao = Gao pu lang te shu Ruili-Bonade dui liu zhong da chi du huan liu dong li xue te xing yan jiu / Xie Yichao. / Abstract --- p.ii / Acknowledgement --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Natural convection and Rayleigh-B´enard convection --- p.1 / Chapter 1.2 --- Governing equation and control parameters of RB Convection --- p.2 / Chapter 1.3 --- The large-scale circulation in turbulent RB convection --- p.4 / Chapter 1.4 --- Motivation and organisation of this thesis --- p.6 / Chapter 2 --- Experimental Setup and Measurement Techniques --- p.7 / Chapter 2.1 --- The convection cell --- p.7 / Chapter 2.1.1 --- The conduction plate and sidewall --- p.7 / Chapter 2.1.2 --- Cooling and heating system --- p.7 / Chapter 2.1.3 --- Level of the convection system --- p.7 / Chapter 2.2 --- The thermistor and it’s calibration --- p.9 / Chapter 2.3 --- Multi-thermal-probe technique --- p.10 / Chapter 2.4 --- Data analysis method --- p.12 / Chapter 2.4.1 --- Sinusoidal fitting method (SF method) --- p.12 / Chapter 2.4.2 --- Temperature extrema extraction method (TEE method) --- p.13 / Chapter 2.5 --- Physical properties of FC77 --- p.14 / Chapter 2.6 --- Other equipment --- p.15 / Chapter 3 --- Dynamics of LSC in high Pr turbulent RBC --- p.16 / Chapter 3.1 --- Background --- p.16 / Chapter 3.2 --- Experimental setup and data analyse method --- p.18 / Chapter 3.3 --- Results and discussion --- p.19 / Chapter 3.3.1 --- General features of the LSC --- p.19 / Chapter 3.3.2 --- Statistics of the angular speed --- p.23 / Chapter 3.3.3 --- Reynolds number Re --- p.30 / Chapter 3.3.4 --- Cessations, reversals and flow mode transitions --- p.34 / Chapter 3.3.5 --- Torsional and sloshing motions of the LSC --- p.42 / Chapter 3.4 --- Summary --- p.48 / Chapter 4 --- Conclusion and outlook --- p.51 / Chapter 4.1 --- Conclusion --- p.51 / Chapter 4.2 --- Outlook --- p.51 / Bibliography --- p.53
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Relations between velocity and temperature fluctuations in turbulent convection. / 湍流對流中速度及溫度漲落量之關係 / Relations between velocity and temperature fluctuations in turbulent convection. / Tuan liu dui liu zhong su du ji wen du zhang luo liang zhi guan xiJanuary 2003 (has links)
Chui Ka Wing = 湍流對流中速度及溫度漲落量之關係 / 徐家榮. / Thesis submitted in: August 2002. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 77-78). / Text in English; abstracts in English and Chinese. / Chui Ka Wing = Tuan liu dui liu zhong su du ji wen du zhang luo liang zhi guan xi / Xu Jiarong. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Background --- p.1 / Chapter 1.2 --- The Kolmogorov 1941 Theory (K41) --- p.3 / Chapter 1.3 --- She-Leveque hierarchical structure(SLHS) --- p.4 / Chapter 1.4 --- Rayleigh-Benard convection --- p.6 / Chapter 2 --- Velocity and temperature structure functions --- p.11 / Chapter 2.1 --- The velocity measurements --- p.11 / Chapter 2.2 --- The characteristic time scales --- p.14 / Chapter 2.3 --- The validity of GESS --- p.18 / Chapter 2.4 --- The validity of SLHS and the estimated values of β --- p.22 / Chapter 3 --- Relations implied by Bolgiano scaling --- p.27 / Chapter 4 --- Correlation between temperature and velocity differences --- p.51 / Chapter 4.1 --- The correlation coefficient --- p.51 / Chapter 4.2 --- Normalized conditional average --- p.53 / Chapter 5 --- Generalized scaling between velocity and temperature struc- ture functions --- p.60 / Chapter 5.1 --- Relations between p and p --- p.70 / Chapter 5.2 --- Relation between Δpv and Δp --- p.72 / Chapter 6 --- Summary --- p.75 / Bibliography --- p.77 / Chapter A --- Derivation of Eq. (1.11) and (1.12) --- p.79 / Chapter A.1 --- Derivation of Eq.(1.11) --- p.79 / Chapter A.2 --- Derivation of Eq.(1.12) --- p.80
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High Prandtl number turbulent convection over rough surfaces. / 在粗糙表面的高普朗特數湍流對流實驗 / High Prandtl number turbulent convection over rough surfaces. / Zai cu cao biao mian de gao Pulangte shu tuan liu dui liu shi yanJanuary 2004 (has links)
Chan Ho-Sun = 在粗糙表面的高普朗特數湍流對流實驗 / 陳浩新. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 69-72). / Text in English; abstracts in English and Chinese. / Chan Ho-Sun = Zai cu cao biao mian de gao Pulangte shu tuan liu dui liu shi yan / Chen Haoxin. / 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.viii / Chapters / Chapter 1. --- Introduction --- p.1 / Chapter 2. --- Theories about the Convection --- p.7 / Chapter 2.1 --- Rayleigh-Benard convection --- p.7 / Chapter 2.2 --- The Convection Equations --- p.8 / Chapter 3. --- Setup of the Experimental Environment --- p.15 / Chapter 3.1 --- The Convection Cell --- p.15 / Chapter 3.2 --- Thermistors --- p.19 / Chapter 3.3 --- The Working Fluids --- p.22 / Chapter 3.4 --- Thermal Measurements --- p.27 / Chapter 3.5 --- Temperature Control Box --- p.28 / Chapter 4. --- Heat Transport Measurement --- p.29 / Chapter 4.1 --- Correction Procedures --- p.30 / Chapter 4.2 --- The Non-Boussinesq Effects --- p.33 / Chapter 4.3 --- Experiment Results --- p.41 / Chapter 4.3.1 --- Triethylene Glycol --- p.41 / Chapter 4.3.2 --- Dipropylene Glycol --- p.45 / Chapter 4.4 --- Discussion on the Results of Heat Transport --- p.50 / Chapter 4.5 --- Discussion on the Results of RMS Fluctuations --- p.60 / Chapter 4.6 --- The data set of pr =1400 --- p.63 / Chapter 5. --- Conclusion --- p.65 / References --- p.69
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High Rayleigh number turbulent thermal convection: a study of structures and statistics of the temperature & velocity field. / 高瑞利數湍流熱對流中溫度和速度場的結構和統計性質研究 / CUHK electronic theses & dissertations collection / High Rayleigh number turbulent thermal convection: a study of structures and statistics of the temperature & velocity field. / Gaoruili shu tuan liu re dui liu zhong wen du he su du chang de jie gou he tong ji xing zhi yan jiuJanuary 2002 (has links)
Zhou Sheng-qi = 高瑞利數湍流熱對流中溫度和速度場的結構和統計性質研究 / 周生启. / "December 2002." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2002. / Includes bibliographical references (p. 134-147) / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese. / Zhou Sheng-qi = Gaoruili shu tuan liu re dui liu zhong wen du he su du chang de jie gou he tong ji xing zhi yan jiu / Zhou Shengqi.
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