Oscillatory flow mixing

Stephens, G.G. and Mackley, M.R. (2002) Heat transfer performance for batch oscillatory flow mixing. Experimental Thermal and Fluid Science, 25, 583-594. 

Smith, K.B. (2000). The scale-up of oscillatory flow mixing. PhD Thesis, University of Cambridge, UK. 

Chew, C. M., Ristic, R. L, Dennehy, R. D., and De Yoreo, J. J. 2004. Crystallization of paracetamol under oscillatory flow mixing conditions. Cryst. Growth Des. 4 1045. 

Problem 3-36. Dispersive Transport Due to Oscillatory Flow in a Channel. It is well known that the application of an oscillatory flow to a partially mixed gas in a tube or a channel will lead to a significant enhancement in the rate of transport of a dilute constituent... 

Figure 8.1 Exponential decay of the variance of the concentration fluctuations in an oscillatory reaction mixed by a chaotic flow. The smooth curve shows the decay of the passive scalar variance in the same flow, for comparison (from Kiss et al. (2004)).

Less work has been done defining the effect of existing ambient stratification on diffusion processes. A few works are worthy of note, however. Sumer and Fischer 90) and Sumer 89) have reported on experiments measuring transverse mixing in oscillatory flows, both in uniform and nonuniform channels. In the uniform channel, the value of a = Dyluh generally decreased as the Richardson number Ri approached 1, where... 

Compatibility with oscillatory flow reaction systems, providing extended residence time in a small volume, with excellent heat transfer and mixing of reactants, whilst preserving a narrow residence time distribution. 

Singh, K.D., 2012. Visco-elastic mixed convection MHD oscillatory flow through a porous medium filled in a vertical channel. Int J. Phys. Math. Sci. 3, 194-205. 

Fig. 6. (a) Schematic view of an extruder channel with an undulating baffle, (b) B, C, D Steady flow streamlines with and without baffles for initial condition A. E, F Mixing in a cavity flow with an oscillating baffle. The upper plate moves with a steady velocity while the lower plate with the baffle undergoes linear oscillatory motion (Jana, Tjahjadi, and Ottino, 1994). 

Formulation of multi-component emulsions and mixtures are of interest in chemical and industrial processes (Vilar, 2008 Vilar et al., 2008). Standard stirred tank reactors (STR) and oscillatory baffled reactors (OBR) are traditional methods for the formulation of liquid-liquid mixtures and liquid-solid emulsions. Compared with STR, oscillatory baffled reactors provide more homogeneous conditions and uniform mixing with a relatively lower shear rate (Gaidhani et al., 2005 Harrison and Mackley, 1992 Ni et al., 2000). Figure 17 is a sketch of a typical oscillatory baffled reactor. It consists of the reactor vessel, orifice plate baffles, and an oscillatory movement part. The orifice plate baffles play an important role in the OBR for the vertex generation in the flow vessels as well as the radial velocities of the emulsions and mixtures. They are equally spaced in the vessel with a free area in the center of each baffle... 

Lin, Tsing Fa. Chang, Tsai Shou, and Chen, Yu Feng, Development of Oscillatory Asymmetric Recirculating Flow in Transient Laminar Opposing Mixed Convection in a Symmetrically Heated Vertical Channel , J. Heat Transfer Vol. 115, pp. 342-352, 1993. 

This qualitative explanation for the oscillatory behavior of the particle number density is supported by theory. Assume the system can be modeled as a continuous steady state stirred tank reactor (CSTR) that is, reactants enter and products leave from a perfectly mixed tank with composition equal to that of the products. The set of equations derived in the previous section applies, but a new term must be subtracted from the right-hand side in each case to account for the loss of particles from the CSTR by the flow process. Equation (10.49) for the change in aerosol surface area with time becomes... 

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