Studies of vortex breakdown and its stability in a confined cylindrical container 7

... was set at 2600 and below with the modulation amplitude A varying from 0.005 to 0.04, and the aspect ratio Λ was maintained at a constant value of 2.5 throughout Note that all flow visualization ... bifurcation is at Re = 271 0, and the second and third occur at Re = 3044 and 3122 Of course, the Hopf frequencies vary with parameters (Re and Λ, as well as A and ωf), but...

Ngày tải lên: 14/09/2015, 14:02

... RECONMMENDATIONS 15 7 PUBLICATIONS 15 9 ACHIEVEMENT 16 1 REFERENCES 16 2 iv SUMMARY A combined experimental and numerical study on vortex breakdown structure and its dynamic behavior in a confined cylindrical ... LC1 state at Re = 2760 and Λ = 1. 704, and (b) an LC2 state at Re = 2750 and Λ = 1. 780, (each state is asymptotically stable) 81 xii Fig 5 .12 Varia...

Ngày tải lên: 14/09/2015, 14:02

... the analysis of the flow dynamics, as well as allowing still image to be captured via a frame grabber card in a PC For some cases, a high resolution still digital camera was also used to obtain ... the data was sampled and acquired over about 20 minutes, Re is nominally constant For those cases with fixed Reynolds number and varying Λ, rotation rate of the top disk was re-adj...

Ngày tải lên: 14/09/2015, 14:02

... experimental results Table presents the values and locations of three local maxima and minima of ψ and η at H/R = 2.5 and Re = 2494 with constant rotating speed The finite differential results ... rotating end 34 CHAPTER NUMERICAL SIMULATION METHOD Two kinds of rotating motions were considered: a constant rotation only and a constant rotation with a superimposed sinusoi...

Ngày tải lên: 14/09/2015, 14:02

... in a low aspect ratio container? This part of the investigation aims to see if an S-shape vortex structure or a spiraltype vortex breakdown can be also produced in a low aspect ratio container ... vortex breakdown, with the upstream and smaller bubble eventually disappears In contrast, the shrinking downstream bubble resulted in the formation of a helical ins...

Ngày tải lên: 14/09/2015, 14:02

... visualization can capture the oscillating frequency of the flow as shown above, hot-film was chosen in the following study as it has an added advantage, particularly in the vicinity of Hopf and ... bifurcations, the same strategy as in the numerical work of Marques et al (2002) was adopted in this study, i.e., once a desired state was obtained at a particular point in (Λ...

Ngày tải lên: 14/09/2015, 14:02

... spatial discretization, utilizing a Galerkin-Fourier expansion in the azimuthal coordinate θ and Chebyshev collocation in r and z The radial dependence of the variables is approximated by a Chebyshev ... equations (Mercader, Net and Falqués 1991) In this study, the aspect ratio Λ was fixed at 2.5 and variations in Re, A and ωf were considered 96 spectral modes in...

Ngày tải lên: 14/09/2015, 14:02

... useful in applications where unsteady vortex breakdown is prevalent, such as the tail buffeting problem 156 CHAPTER CONCLUSIONS AND RECOMMENDATIONS 8. 2 Recommendations A confined cylindrical container ... Mechanics, Vol 599, No 3, pp441-464, 20 08 Y.D Cui, T.T Lim and H.M Tsai, “Blowing and suction effects on vortex breakdown in an enclosed cylindrical container...

Ngày tải lên: 14/09/2015, 14:02

... dimerization of cystatin F could be a process regulating its inhibitory properties Screening of proteases for their inhibition showed that cystatin F is different from other cystatins, both in terms of ... mutants of cystatin C have been prepared yet to study the effect of incorporating the FEBS Journal 272 (2005) 15351545 ê 2005 FEBS T Langerholc et al Cystatin...

Ngày tải lên: 19/02/2014, 17:20

... imagine the old knight, only half aware of the sunshine of the evening, the noise of the streets, the looks of the crowd, the great minster rising half-finished in the midst of the town by the ... and daughters -in- law, forming a hierarchy attending to the business of factory or counting-house under the orders of the father of the family, an...

Ngày tải lên: 21/02/2014, 21:20

... Shin-ichiro and Wakao, Takahiro (1992) Metonymy: reassessment, survey of acceptability, and its treatment in a machine translation system Locating 1.1 Container for Content Dave drank the glasses The ... Metonymic interpretation and associative processes in natural language In Exxon has raised its price again Washington is insensitive to the needs of the pe...

Ngày tải lên: 23/03/2014, 20:20

... and its parts in a sub-adult female population of North India Methods The study was conducted in a selected area of Tehsil Kalka, in the District of Panchkula in Haryana state, Northern India ... Estimation of stature from the foot and its segments in a sub-adult female population of North India Kewal Krishan1,*, Tanuj Kanchan2...

Ngày tải lên: 10/08/2014, 21:24

... Ministry of Education authorized and facilitated the study The following played invaluable roles in data collection: Zaina Al-Zabin, Nahed Kamel, Abdel W Awadalla, and Sumai (and Ministry of Education ... 0.0001) Covariance analysis It was necessary to analysis of covariance in order to understand the impact of anxiety, depression, selfesteem and difficulty with studi...

Ngày tải lên: 11/08/2014, 15:22

... serostatus was 4.8% in males and 6.9% in females The prevalence of probable diabetes was 0.4% in both males and females, and of probable hyperglycaemia was 3.0% in males and 2.8% in females Of the ... smoking for males and females Missing data on age at first sex for male and females Missing data on partners in past year for males and females Missing data on...

Ngày tải lên: 11/08/2014, 15:22

... confirmed individual bicoid binding sites in these sequences, these sequences not contain clusters of bicoid binding sites Assessment of gene regulation Enhancers may contain clusters of TF binding ... Individual regulatory segment of DNA can contain many binding sites for several factors, often substantially overlapping with each other [5] This brings about a problem of s...

Ngày tải lên: 12/08/2014, 17:20