Studies of vortex breakdown and its stability in a confined cylindrical container 4

... 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 instability of increasing wavelength ... R of 87.25 mm, and a matching rotating disk at the top and a stationary disk at the bottom of the cylinder The height H of the flow domain, and the aspect ratio Λ = H/R, can be varied by moving...

Studies of vortex breakdown and its stability in a confined cylindrical container 1

... 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 Variation of ΔE0 with Re for (a) LC1 and (b) LC2, at ... for vortex breakdown, and the concave shape of the streamsurfaces of a confined swirling flow may be considered as an additional characteristic of vortex breakdown They argued that the swirling...

Studies of vortex breakdown and its stability in a confined cylindrical container 2

... 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-adjusted to account ... disk has a maximum excursion of 0.040 mm (about 0.03º) and a nominal gap of 0.40 mm between the rotating plate and the cylinder The disk was driven by a microstepper motor operating at 20 ,000...

Studies of vortex breakdown and its stability in a confined cylindrical container 3

... 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 sinusoidal modulation In all ... is adopted, with the origin at the centre of the rotating end wall and the positive-z axis pointing towards the stationary endwall R H z Ω θ r Fig 3. 1 Flow configuration in a confined cylinder...

Studies of vortex breakdown and its stability in a confined cylindrical container 5

... 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, Re) parameter space, ... Fig 5. 30 Hot-film data (time series over minute and corresponding the amplitude of the FFT results) taken at times as indicated, starting with an LC1 state at Re = 2700 and Λ = 1. 757 and increased...

Studies of vortex breakdown and its stability in a confined cylindrical container 6

... 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 z, 64 in r, and up to 24 in θ ... QUENCHING OF UNSTEADY VORTEX BREAKDOWN Fig 6. 12 Phase portraits (with Wa and Ww as the horizontal and vertical axes, respectively) at Re = 2800, Λ = 2.5, ωf = 0.5 (ωf /ω0 ≈ 2.88) and A as indicated...

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 these variations are ... essentially steady, with the streamlines virtually identical to those of the A = steady state shown in Fig 7. 1, and all the oscillations are concentrated in the bottom and sidewall boundary layers...

Studies of vortex breakdown and its stability in a confined cylindrical container 8

... 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 , Paper AIAA 2007-4360, 37th AIAA ... (forcing) stabilize the flow or not 1 58 PUBLICATIONS LIST OF RELATED PUBLICATIONS T.T Lim and Y.D Cui, “On the generation of a spiral-type vortex breakdown in an enclosed cylindrical container ,...

Tài liệu Báo cáo khoa học: Inhibitory properties of cystatin F and its localization in U937 promonocyte cells ppt

... 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 F in U937 cells Fig Immunolabeling of cystatin ... activity of the enzyme) Dimerization of cystatin F leads to a loss of inhibitory activity (C) Immunoblot of cystatin F run on nondenaturing PAGE Cystatin F (200 nM) was incubated 15 at 37 C in phosphate...

Tài liệu Euphorion Being Studies of the Antique and the Mediaeval in the Renaissance - Vol. II pot

... 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, and to the economy of the house-under the superintendence ... joyous orange against the greenness of the hill Such spots there are and many in the winter of the Middle Ages; though it is not in them, but where the rain beats, and the snow and the wind tugs, that...

Báo cáo khoa học: "METONYMY: REASSESSMENT, SURVEY OF ACCEPTABILITY, AND ITS TREATMENT IN A MACHINE TRANSLATION SYSTEM S" ppt

... 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 people Language and Artificial Intelligence, Makoto ... that the main factors for treating metonymy correctly in a multilingual machine translation system are 1) its universality, which can be a guideline for the analysis component, 2) language dependency,...

Báo cáo y học: "Estimation of stature from the foot and its segments in a sub-adult female population of North India" pps

... 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 and Neelam Passi1 Department of Anthropology, Panjab University, ... located in villages Nanakpur, Marranwala and Bassolan of Tehsil Kalka, District Panchkula in Haryana state of North India for allowing data collection Thanks are also due to the subjects who have...

Báo cáo y học: " Profile of subjective quality of life and its correlates in a nation-wide sample of high school students in an Arab setting using the WHOQOL-Bref" pot

... 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 studies and social relations on the noted ... reflect a circumstance of social disadvantage and poor psychological well-being in which girls fared worse than boys The findings indicate that programs Al-Fayez and Ohaeri BMC Psychiatry 2011,...

Prevalence of severe mental distress and its correlates in a population-based study in rural south-west Uganda doc

... 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 consulting a traditional healer ... prevalence and socio-demographic correlates of mental distress in Addis Ababa, Ethiopia Acta Psychiatr Scand 1999, 397:5-10 Kinyanda E: Mental health chapter In The Support to the Health Sector Strategic...

Báo cáo sinh học: " Exact p-value calculation for heterotypic clusters of regulatory motifs and its application in computational annotation of cis-regulatory modules" doc

... 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 studying of co-occurring motifs ... probability of observing similar site arrangements in a random sequence This idea of evaluating the statistical significance of heterotypic clusters of sites was implemented in many programs including...

Xem thêm

Từ khóa: Nghiên cứu sự biến đổi một số cytokin ở bệnh nhân xơ cứng bì hệ thống Nghiên cứu sự hình thành lớp bảo vệ và khả năng chống ăn mòn của thép bền thời tiết trong điều kiện khí hậu nhiệt đới việt nam Nghiên cứu tổ chức pha chế, đánh giá chất lượng thuốc tiêm truyền trong điều kiện dã ngoại Một số giải pháp nâng cao chất lượng streaming thích ứng video trên nền giao thức HTTP Nghiên cứu vật liệu biến hóa (metamaterials) hấp thụ sóng điện tử ở vùng tần số THz Biện pháp quản lý hoạt động dạy hát xoan trong trường trung học cơ sở huyện lâm thao, phú thọ ĐỒ ÁN NGHIÊN CỨU CÔNG NGHỆ KẾT NỐI VÔ TUYẾN CỰ LY XA, CÔNG SUẤT THẤP LPWAN NGHIÊN CỨU CÔNG NGHỆ KẾT NỐI VÔ TUYẾN CỰ LY XA, CÔNG SUẤT THẤP LPWAN SLIDE Phát hiện xâm nhập dựa trên thuật toán k means Nghiên cứu khả năng đo năng lượng điện bằng hệ thu thập dữ liệu 16 kênh DEWE 5000 Định tội danh từ thực tiễn huyện Cần Giuộc, tỉnh Long An (Luận văn thạc sĩ)Thơ nôm tứ tuyệt trào phúng hồ xuân hương Kiểm sát việc giải quyết tố giác, tin báo về tội phạm và kiến nghị khởi tố theo pháp luật tố tụng hình sự Việt Nam từ thực tiễn tỉnh Bình Định (Luận văn thạc sĩ)Quản lý nợ xấu tại Agribank chi nhánh huyện Phù Yên, tỉnh Sơn La (Luận văn thạc sĩ)BT Tieng anh 6 UNIT 2 Nguyên tắc phân hóa trách nhiệm hình sự đối với người dưới 18 tuổi phạm tội trong pháp luật hình sự Việt Nam (Luận văn thạc sĩ)Giáo án Sinh học 11 bài 14: Thực hành phát hiện hô hấp ở thực vật Trách nhiệm của người sử dụng lao động đối với lao động nữ theo pháp luật lao động Việt Nam từ thực tiễn các khu công nghiệp tại thành phố Hồ Chí Minh (Luận văn thạc sĩ)Chiến lược marketing tại ngân hàng Agribank chi nhánh Sài Gòn từ 2013-2015 QUẢN LÝ VÀ TÁI CHẾ NHỰA Ở HOA KỲ