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มีใครเคยทำvortex tubeเล่นบ้างมั้ยครับ
Vortex Tube Phenomenon
The vortex tube was discovered in 1930 by French physicist Georges Ranque. Vortec was the first company to develop this phenomenon into practical, effective cooling solutions for industrial applications. Here's how it works.
Fluid that rotates about an axis -- like a tornado -- is called a vortex. A vortex tube creates a vortex from compressed air and separates it into two air streams -- one hot and one cold. Compressed air enters a cylindrical generator which is proportionately larger than the hot (long) tube where it causes the air to rotate. Then, the rotating air is forced down the inner walls of the hot tube at speeds reaching 1,000,000 rpm. At the end of the hot tube, a small portion of this air exits through a needle valve as hot air exhaust. The remaining air is forced back through the center of the incoming air stream at a slower speed. The heat in the slower moving air is transferred to the faster moving incoming air. This super-cooled air flows through the center of the generator and exits through the cold air exhaust port.
ITW Vortec's vortex tube products have been solving industrial cooling problems for years. Using only filtered, factory compressed air as a power source, they convert ordinary compressed air into two air streams -- one hot and one cold. At 100 PSIG (6.9 Bar) and 70° F (21° C) inlet temperature, a vortex tube can produce refrigeration up to 6000 BTUH (1512 kcal/H) or temperatures to -40° F (-40° C).
"Cold Fraction": an important term for understanding Vortex Tube performance
"Cold Fraction" is the percentage of input compressed air that's released through the cold end of the tube. As a rule of thumb, the less cold air you release, the colder the air will be. You adjust the cold fraction with the control knob.
Cold fraction is also a function of the type of vortex generator that's in the tube, i.e., a "high cold fraction" or "low cold fraction" generator.
Most industrial process applications use a high cold fraction (above 50%). A high cold fraction tube can easily give you cold outputs 50-90°F (28-50°C) below your compressed air temperature.
High cold fractions give you a greater air flow, but they don't give the lowest possible temperatures. The high cold fraction combination of airflow and cold temperature produces the maximum refrigeration capacity, or greatest Btu/H (Kcal/H).
A low cold fraction (below 50%) means a smaller volume of air coming out that's very cold (down to -40°F/-40°C). In short, the less air you release, the colder the air.
Just remember, your maximum Btu/H (Kcal/H) capacity (also called maximum cooling or refrigeration) occurs with a high cold fraction tube.
Two tubes, ten levels of performance
AiRTX's modular design vortex tube gives you ten ranges of performance from a single tube, simply by changing the one-piece vortex generator. Both high and low cold-fraction generators are available for 8, 10, 15, 25 and 35 SCFM (220, 280, 420, 700, 990 SLPM) input flows. You can purchase vortex generators individually or in a kit that includes all sizes.
Other accessories include hot- and cold-end mufflers, air filters, regulators, thermostats and solenoid valves.
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PUFF The magic dragon  
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13 ต.ค. 50 09:04:32
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