Time-pulsing mixing

Time-pulsing Mixing Most Relevant Citations 

Time pulsing can be characterized by the Strouhal number (St), which is a dimensionless parameter describing the ratio of the flow characteristic time scale (L/V) to the pulse time period (1/j) [Eq. (1.8)] [26], where Lis the hydraulic diameter, V the average velocity in the outlet channel and/the pulsing frequency. For a pulsing frequency of 5 Hz, a Strouhal number of 0.375 derives. 

Another paper describes the stretching and folding of material lines yielded by simulation and experimental imaging, induced by time-pulsing mixing via unsteady cross-flow injection in a steady-flow main channel [48], 

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Time-pulsing Mixing Most Relevant Citations... 

This mixed influence can be observed from the expression of (Eqs. 3.68 and 3.69). In order to analyze the influence of the electrode size, Fig. 3.10a shows the current-potential curves obtained for a charge transfer process with different values of the dimensionless rate constant K°phe for a fixed/ 0 = 10-4 cm s 1 in NPV with a time pulse t = 0.1 s (i.e., for different values of the electrode radius ranging from 100 to 1 pm). As a limiting case useful for comparison, the current-potential... 

M 83] [P 72] If the amplitude for time pulsing is doubled, the degree of mixing remains unchanged, being 22% in both cases [26], The increase in amplitude amounts to a maximum flow rate of 17.0 mm s 1 instead of 8.5 mm s 1 used formerly. 

Glasgow, I., Aubry, N., Enhancement of microfluidic mixing using time pulsing, Lab Chip 2003, 3,114-120. 

The limit for the measured rate constants is determined by the mixing rate and the instrument s dead time, defined as the time required for the solution to travel from the mixing chamber to the observation point. Nowadays, half-times in the millisecond range can be measured routinely. An extension of accessible rates up to 2000 s through algebraic corrections for mixing effects was discussed [11]. Under the assumption that the behavior of the solution at short times after mixing in the stopped-flow is described by the same equations that were found applicable for pulsed-accelerated flow, the precise rate constant can be obtained from a set of experiments carried out under pseudo-first-order conditions by use of Eq. 10. 

Rg. 2.17 (a) A schematic representation of the generic two-dimensional NMR pulse sequence, with evolution time h, mixing period and detection time t2. (b) The separation of anisotropic chemical shift patterns for different chemical shifts (see the text), ((a) reproduced and (b) adapted by permission of Academic Press.)... 

I. Glasgow, N. Aubry, Enhancement of Microfluidic Mixing Using Time Pulsing. 

Laser Repetition Rate and Cell Wash-Out Time The pulse mixing and signal tailing that are induced during the aerosol transport is a common limitation of LA-ICP-MS in terms of depth profiling resolution. In order to avoid any mixing of information... 

The interval between the second and third pulse is called the mixing time, during which the spins evolve according to the multiple-spin version of equation B 1.13.2 and equation B 1.13.3 and the NOE builds up. The final pulse converts the longitudinal magnetizations, present at the end of the mixing time, into detectable transverse components. The detection of the FID is followed by a recycle delay, during which the equilibrium... 

The time resolution of these methods is detennined by the time it takes to mitiate the reaction, for example the mixing time in flow tubes or the laser pulse width in flash photolysis, and by the time resolution of the detection. Relatively... 

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