Taylor vortex flow

Preparation of Monodisperse, Spherical Oxide Particles by Hydrolysis of Metal Alkoxide Using a Couette-Taylor Vortex Flow Reactor... 

Figure 14 Progress of time-dependent Taylor vortex flow around critical Reynolds number, 6 = 111. (Dutta and Ray, 2004).

Figure 15 Photograph of flow pattern at different Reynolds number, (a) Taylor vortex flow (Re = 177), (b) wavy vortex flow (Re = 505), (c) weakly turbulent vortex flow (Re = 3027), and (d) turbulent vortex flow (Re = 8072) (Dutta and Ray, 2004).

As an alternative to a cascade of CSTR trains, a novel continuous reactor with a Couette-Taylor vortex flow (CTVF) has been proposed, which can realize any flow pattern between plug and perfectly mixed flows [361-366]. A continuous Couette-Taylor vortex flow reactor (CCTVFR) consists of two concentric cylinders with the inner cylinder rotating and with the outer cylinder at rest. Figure 29 shows a typical flow pattern caused by the rotation of the inner cylinder. 

Nomura et al. [360,364] first utilized a Couette-Taylor vortex flow reactor (CTVFR) for the continuous emulsion polymerization of St to clarify its char-... 

Ohmura N, Suemasu T, Asamura Y. (2005) Particle classification in Taylor vortex flow with an axial flow. J. Phys., 14 64—71. 

Couette-Taylor Continuous emulsion pol)mierization of styrene in a Couette-Taylor vortex flow reactor comprehensive kinetic study in dependence on reactor operation parameters 179... 

Taylor vortex flow Continuous emulsion polsmierization of Stsrene, influence of flow conditions 180... 

Dr Coney (1971) researched Taylor vortex flow with particular interest in rotary heat exchangers, which he later used in a rotary vapour compression cycle heat pump. Taylor-Couette flows are used in commercial intensified reactors now (see Chapter 5). 

Coney, J.E.R. (1971). Taylor vortex flow with special reference to rotary heat exchangers. 

Couette flow is a laminar circular flow occurring between a rotating (inner) cylinder and a static one, and the extension via increased speed of rotation to centrifugally-driven instabilities leads to laminar Taylor vortex flow, tending to turbulent flow as speed increases. Poiseuille flow is axial. 

Fenstermacher, P. R., Swinney, H. L., Gollub, J. P. (1979) Dynamical instabilities and the transition to chaotic Taylor vortex flow. J. Fluid Mech. 94, 103 Field, R. J., KOrds, E., Noyes, R. M. (1972) Oscillations in chemical systems. II. Thorough analysis of temporal oscillations in the bromate-cerium-malonic acid system. J. Am. Chem. Soc. 94, 8649 Fife, P. C. (1976a) Singular perturbation and wave front techniques in reaction-diffusion problems. SIAM-AMS Proc. 10, 23... 

Taylor vortices are toroidal in form and constitute a secondary laminar flow superimposed on the basic Oouette flow. For many years it has been suggested that the sequence of flows occurring as the Taylor number is increased is Couette flow, Taylor vortex flow, wavy Taylor vortex flow with travelling azimuthal waves superimposed on the... 

Taylor vortices, amplitude modulated wavy Taylor vortex flow, and finally chaotic or turbulent flow. However, recent experimental v rk suggests that the transition process depends critically on both the annulus aspect ratio, r = 1/d, and the vortex cell axial lengtiVgap ratio, /A and that many different routes to turbulence are possible. 

Linear stability theory for the infinite cylinder case predicts the appearance of Taylor vortices with cell size X. Kogelman and Di Prima (ll) have analysed e st ility of Taylor vortex flow for snail values of T-T and have shenmn that there ocists a oontinuim of solutions that are stable covering a range of X centred approximately on x. ... 

ALZIARJf de BDQUEP( r, T. and GRILLAUD, D. "Computation on Taylor vortex flow by a transient implicit method." Computers and Fluids, 1978, 6, 259-269. 

EL-DUJAILK, M.J. "End effects on sub-critical and Taylor vortex flow between concentric and eccentric cylinders." KiD. Ttiesis. Department of Mechanical Engineering, university of Leeds, 1983. 

FENSTERMACHER, P.R., SWINNEY, H.L. and (30LLUB, j.p. "Dynamic inst ility and the transition to chaotic Taylor vortex flow." J. Fluid Mech. 1979, 94, 103-128. 

HAJI ISMAIL, A.W.B. "An investigation of Taylor vortex flow using torgue measurements and hot film aneometry." PhD. Thesis, Dept. Mech. Eng. University of Leeds. 1982. 

Fig. 4. The computation of the dimension of an attractor is illustrated using velocity data obtained fof a weakly turbulent flow in the Couette-Taylor system at R/R =16.0, where R is the Reynolds number for the onset of time-independent Taylor vortex flow. The different curves correspond to different embedding dimensions m. (a) The dependence of N(e), the average number of points within a ball of radius e, on e. (b) The slope of the curves shown in (a). Regions A,...

Reactor configurations involved in continuous emulsion polymerization include stirred tank reactors, tubular reactors, pulsed packed reactors, Couett-Taylor vortex flow reactors, and a variety of combinations of these reactors. Some important operational techniques developed for continuous emulsion polymerization are the prereactor concept, start-up strategy, split feed method, and so on. The fundamental principles behind the continuous emulsion polymerizations carried out in the basic stirred tank reactor and tubular reactor, which serve as the building blocks for the reaction systems of commercial importance, are the major focus of this chapter. 

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