Vortex Diode

Extreme diodity values as high as X> =20 have been demonstrated in some of the best vortex diodes, based on centrifugal effects in rotating fluid (while with the Venturi and labyrinth diodes it is considered a success if the diodity reaches T> 1.6). Unfortunately, the vortex spin-up and spin-down times are so long that pumps using vortex diodes have to be switched between the OPEN and CLOSED regimes after quite long... 

Fluidic devices are gaining more importance in reprocessing plants and works have been done on vortex diodes, by which, a resistance ratio of about 50 has been achieved so far. Design codes are developed for the design of reverse flow diverter (RFD) pumps and constant voltime feeders are developed for very low capacity (1-5 1/h) using bent pipes and cylindrical buckets. 

Valve-Less Rectification Pumps, Figure 7 The Tesla diode, one of the earliest no-moving-part devices. As shown here, it is usually used in a multi-stage layout. Diodity is very much worse than with vortex diodes... 

Valve-Less Rectification Pumps, Figure 6 A simple version of the vortex diode. At left is the closed state with rotation in the vortex chamber at right is the easy flow, open state with radial forward flow. High-performance diodes have several tangential inlets info the chamber, resulting in symmetric character of the flow - but lead to an even more difficult spatial layout of the rectifier circuit... 

Multiplexed diode-laser sensors were applied for measurement and control of gas temperature and species concentrations in a large-scale (50-kilowatt) forced-vortex combustor at NAWC to prove the viability of the techniques and the robustness of the equipment for realistic combustion and process-control applications [11]. The scheme employed was similar to that for measurements and control in the forced combustor and for fast extractive sampling of exhaust gases above a flat-flame burner at Stanford University (described previously). 

Valve-Less Rectification Pumps, Fig. 16 Tesla diode, the earliest no-moving-part device designed to exhibit a large difference between the properties in forward and return flow direction. While the forward flow left, top) is almost straight, the reverse flow right, bottom) enters the complex curved flowpath. Diodity, even in the typical multi-stage layout, is not high, much worse than obtainable with vortex-type fluidic diodes... 

Fluidic diodes and vortex valves are passive devices whose use in future nuclear power plants (NPPs) is currently under evaluation with reference to their potential use as check valves or actuation valves in safety-related systems. Fluidic diodes, used in reprocessing plants and chemical industries, are one-way valves with no moving parts. They are characterized by a very high flow resistance in one... 

Stock solutions of taxol in methanol (5mg/ml) was added with a weight ratio of 0.2 1 to 1 ml of OCL worm micellar solutions at different concentrations and vortexed for 5 minutes. The small amount of methanol was removed by dialysis at 4 °C for 2 hours. Unloaded taxol precipitate was centrifuged down at 3000 rpm for 5 min and further removed from the micelle supernatant by filtering with a 0.45 pm pore-sized syringe filter. The amount of taxol loaded into OCL worm micelles was then determined by HPLC. A Waters Breeze HPLC equipped with a diode array UV detector set at A, = 220 nm, connected with a Symmetry C-18 column, methanol as the mobile phase, and a flow rate of 0.8 mL/min was used. Taxol is well resolved from OCL peak, and the amount of taxol was estimated from its calibration curve that correlates peak area with amount. 

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