Research papers on vortex tube

JSME international journal.

Optimization of thermal performance of Ranque Hilsch Vortex Tube: MADM techniques - IOPscience

C, Dynamics, control, robotics, design and manufacturing. A, Mechanics and material engineering. Already have an account? Login in here. Bulletin of JSME. Journal home Journal issue About the journal. Published: received: February 14, Released: February 15, accepted: - [Advance Publication] Released: - corrected: -. Article overview. References Related articles 0. In the situation where the valve is replaced by a vortex tube, the corresponding expansion for the fluid extracted from the cold side of the tube would be limited to an isentropic process, for reasons described earlier.

The limiting exit states would therefore be 4c. These refrigeration devices. The vortex tube produces a large temperature drop in the cold exit fluid regardless of the JouleThomson coefficient. Miscellaneous Keeping Camera Lens Clear and Cool: An industry in Asia had multiple Boroscope lenses that needed to be kept cool and clear while being inserted into an Fahrenheit boiler porthole. Speeding up Cycle Time: A manufacturer in Mexico produces moulded plastic pedals for bicycles and needed help in finding a solution to cool their moulded parts down so they could increase cycle times.

Cooling a garage door Seal: Before exterior garage door seals can be coated with a colour that will match the garage door and its trim, the initial extrusion must be cool. A vortex Tube can speed this cooling process up.

Chilling a Mandrel for Jewellery Crafting: A ring mandrel is easily one of the most useful tools for sizing, crafting and re-shaping jewellery. Each of these mandrels is designed for one or more special applications in jewellery crafting. By blowing chilled air, with a vortex Tube onto the mandrel, thermal expansion of the mandrel was eliminated even as temperatures rose throughout the day.

All the different sizes, lengths, diameters, wall thickness, etc. Not all the articles are directly related to our work, especially, those articles which were focused on computational work. Many articles addressed experimental findings and remaining discussed various theories explaining energy separation phenomenon.

Most of the researchers conducted experiments to study the effect of the following parameters on the energy separation characteristics of the vortex tube: Thermo-physical parameters like the fluid, inlet pressure, temperature, etc.

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The first study on the separation of mixtures with the Ranque Hilsch vortex tube was published in by Linderstrom-Lang and in by Marshall. The gas mixtures oxygen and nitrogen, carbon dioxide and helium, carbon dioxide and air, and other mixtures were used as the working medium in their work. In the vortex tube system was used for carbon-dioxide separation by K. In the Ranque Hilsch vortex tube system was used to enrich the concentration of methane by Manohar. In , natural gas was used as working medium and with the vortex tube natural gas was liquefied by Poshernev.

In , two-phase propane was used as the working medium by Collins. It was found that when the degree of dryness defined as the ratio of the mass of gaseous part over the total mass of the liquid and gaseous propane is higher than 0. With two-phase working medium, the degree of dryness is an important parameter, when the degree of dryness is larger than some critical value, energy separation occurs.

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So it proves that for the energy separation process, compressibility. Experimental results obtained by varying thermo-physical parameters can be summarized as follows: The working media is very important in the operation of the vortex tube system. By selecting different working media, the performance of the system can be optimized, and The vortex tube can be used for utilizing waste pressure energy even if the pressure energy is in the form of non-condensed gases, inert gases or liquid vapours.

Depending upon the position of cold exhaust, we can call vortex tube as counter flow or uniflow vortex tube. From the experimental investigation, it was found that the performance of the uniflow vortex tube is inferior to that of the counter-flow vortex tube. So, most of the time, the counter-flow geometry was chosen. The literature concerning the design, operation and performance of vortex tubes is extensive, with descriptions first appearing in Hilsch with excellent review papers by H. Gao et. Studies focusing on the role of internal geometry include: Takahama , Hartnet and Eckert , J.

Marshall , M. Saidi and Eiamsa-ard, S. During s, Takahama carried out experimental studies on pressure and temperatures inside the vortex tube and studied the effect of various geometric factors on its energy separation characteristics. In , J.

2D Numerical Simulation of a Micro Scale Ranque-Hilsch Vortex Tube

Marshall confirmed experimentally that separation is primarily dependent upon centrifugation. His results appear substantially to indicate in comparing the standard and large tubes that the gas separation performance is the same if the effect of overall pressure drop is considered. In , M. Finally, of importance to the work discussed here, several researchers have sought to characterize the internal flow details including the existence of a secondary flow circulation.

Specifically, in , Ahlborn and Groves [8] used a pitot tube to observe a secondary flow within the vortex tube. From the measured velocity field they determined that the return flow at the center of the tube is much larger than the cold mass flow emerging out of the cold end. Therefore, the vortex tube must have a secondary circulation imbedded into the primary vortex, which moves fluid from the back flow core to the outer regions.

Most theories are based on results obtained from the related experimental work; some are based on numerical simulations. In Gutsol and in Leontev have published detailed reviews about the Ranque Hilsch vortex tube theories.

He hypothesized that the energy separation is due to adiabatic expansion in the central region and adiabatic compression in the peripheral region. In Hilsch used similar ideas to explain the phenomenon in the vortex tube, but introduced the internal friction between the peripheral and internal gas layers. He used this model to explain his experimental results rather well.

Because the process in the vortex tube is not truly adiabatic, this model was later rejected. He stated that Fresh gas before it has travelled far in the tube succeeds in forming an almost free vortex in which the angular velocity or rpm is low at the periphery and very high toward the center. During the internal friction process between the peripheral and central layers, the outer gas in turn gains more kinetic energy than it loses internal energy and this leads to a higher gas temperature in the periphery; the inner gas loses kinetic energy and so the gas temperature is lower.

Vortex tube

Lay used the potential and forced vortex motion for the vortex tube analysis and proposed via an elegant mathematical formalization that the internal friction effect and turbulence are the main reason for the energy separation. Kreith , Alimov also attributed the friction effect as reason for the energy separation.

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Reynolds, Deissler also pointed out that the energy separation is due to friction and turbulence. Van Deemter in performed numerical simulation work based on the extended Bernoulli equation. He had similar ideas as Fulton. There is a remarkable agreement between his model and Hilschs measurements. Deissler, Reynolds, and Lewellen all presented mathematical analysis based on the turbulent Nevior Stokes N-S equation.

Based on their analysis, they came to the common conclusion that heat transfer between flow layers by temperature gradients and by pressure gradients due to turbulent mixing, turbulent shear work done on elements are the main reasons for the energy separation. The work concluded that the energy separation is mainly due to internal friction and turbulence characterized by the turbulent viscosity number.