Synthetic jet explained

In fluid dynamics, a synthetic jet flow—is a type of jet flow, which is made up of the surrounding fluid.[1] Synthetic jets are produced by periodic ejection and suction of fluid from an opening. This oscillatory motion may be driven by a piston or diaphragm inside a cavity among other ways.[2] [3] [4]

A jet flow is a fluid flow in which a stream of one fluid mixes with a surrounding medium. An example is a water jet that forms when you put your thumb over the end of a hose. The water mixes with air to form a jet. If you increase the flow of water or move your thumb to change the diameter of the exit, the jet will change dramatically.

Jet flows vary depending on velocity and diameter of the flow and the density and viscosity of the fluid (Reynolds number and Mach number). When the velocities in the jet are greater than the speed of sound, important qualitative changes in the flow occur. One such change is that shock waves form.[5]

A synthetic jet flow was so named by Ari Glezer since the flow is "synthesized" from the surrounding or ambient fluid. Producing a convectional jet requires an external source of fluid, such as piped-in compressed air or plumbing for water.

Synjet devices

Synthetic jet flow can be developed in a number of ways, such as with an electromagnetic driver, a piezoelectric driver, or even a mechanical driver such as a piston. Each moves a membrane or diaphragm up and down hundreds of times per second, sucking the surrounding fluid into a chamber and then expelling it. Although the mechanism is fairly simple, extremely fast cycling requires high-level engineering to produce a device that will last in industrial applications.

For hot spot thermal management, the Synjet, commercially offered by Austin, Texas–based company Nuventix,[6] was patented in 2000 by engineers at Georgia Tech.[7] The tiny synjet module creates jets that can be directed to precise locations for industrial spot cooling. Traditionally, metallic heat sinks conduct heat away from electronic components and into the air, and then a small fan blows the hot air out. Synjet modules replace or augment cooling fans for such devices as microprocessors, memory chips, graphics chips, batteries, and radio frequency components. Additionally, SynJet technology has been used for the thermal management of high power LEDs[8]

Synthetic jet modules have also been widely researched for controlling airflow in aircraft to enhance lift, increase maneuverability, control stalls, and reduce noise.[9] Problems in applying the technology include weight, size, response time, force, and complexity of controlling the flows.[10] [11] [12] [13]

A Caltech researcher has even tested synthetic jet modules to provide thrust for small underwater vehicles, modeled on the natural jets that squid and jellyfish produce.[14] Recently, research team at the School of Engineering, Taylor's University (Malaysia), successfully used synthetic jets as mixing devices.[15] Synthetic jets prove to be effective mixing devices especially for shear sensitive materials.

References

  1. Smith . Barton . Glezer . Ari . 1998 . Smith, B. L., & Glezer, A. (1998). The formation and evolution of synthetic jets . Physics of Fluids . 10 . 9. 2281–2297. 10.1063/1.869828 .
  2. Agrawal . Amit . Verma . Gunjan . 2008 . Similarity analysis of planar and axisymmetric turbulent synthetic jets . International Journal of Heat and Mass Transfer . 51 . 25–26. 6194–6198 . 10.1016/j.ijheatmasstransfer.2008.04.011 .
  3. Kotapati . Rupesh B. . Mittal . Rajat . Louis . N. Cattafesta III . 2007 . Numerical study of a transitional synthetic jet in quiescent external flow . Journal of Fluid Mechanics . 581 . 287–321 . 10.1017/S0022112007005642 . 2007JFM...581..287K . 7596423 .
  4. Book: Kamran Mohseni. Synthetic Jets: Fundamentals and Applications. 2014. CRC Press. 9781439868102. Rajat Mittal . (http://www.crcpress.com/product/isbn/9781439868102)
  5. American Heritage Dictionary
  6. Web site: Nuventix - Active Thermal Management Hot Spot Cooling, Air Cooled Heat Exchangers: Nuventix . 2009-01-13 . 2009-01-05 . https://web.archive.org/web/20090105224119/http://www.nuventix.com// . live .
  7. Web site: VentureLab company commercializes synthetic jets for cooling . 2007-09-18 . dead . https://web.archive.org/web/20060902074052/http://www.venturelab.gatech.edu/Portals/57/december12003.htm . 2006-09-02 .
  8. Web site: Aavid, Thermal Division of Boyd Corporation . 2013-02-07 . 2015-04-07 . https://web.archive.org/web/20150407021514/http://www.nuventix.com/led-cooling/ . live .
  9. KOTAPATI . RUPESH B. . MITTAL . RAJAT . MARXEN . OLAF . HAM . FRANK . YOU . DONGHYUN . CATTAFESTA . LOUIS N. . Nonlinear dynamics and synthetic-jet-based control of a canonical separated flow . Journal of Fluid Mechanics . Cambridge University Press (CUP) . 654 . 2010-05-11 . 0022-1120 . 10.1017/s002211201000042x . 65–97. 2010JFM...654...65K . 9803739 .
  10. Web site: MRS Website : Piezoelectric Actuators for Synthetic Jet Applications.
  11. http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000129000007000825000001&idtype=cvips&gifs=yes
  12. Web site: Active Flow Control with Adaptive Design Techniques for Improved Aircraft Safety. sbir.nasa.gov. 2021-10-27. 2021-06-09. https://web.archive.org/web/20210609121814/https://sbir.nasa.gov/SBIR/abstracts/05/sttr/phase2/STTR-05-2-T2.02-9831.html. live.
  13. Web site: Apparatus, method and system for gas turbine engine noise reduction - US Patent 7159383 Claims . 2014-01-07 . dead . https://archive.today/20140107235226/http://www.patentstorm.us/patents/7159383-claims.html . 2014-01-07 .
  14. Book: https://ieeexplore.ieee.org/document/1570116. 10.1109/ROBOT.2005.1570116. Synthetic Jet Propulsion for Small Underwater Vehicles. Proceedings of the 2005 IEEE International Conference on Robotics and Automation. 181–187. 2005. Thomas. A.P.. Milano. M.. g'Sell. M.G.. Fischer. K.. Burdick. J.. 0-7803-8914-X. 15262116. 2019-07-15. 2017-12-02. https://web.archive.org/web/20171202120100/https://authors.library.caltech.edu/25088/1/Thomas2005p96102008_Ieee_International_Conference_On_Robotics_And_Automation_Vols_1-9.pdf. live.
  15. Al-Atabi . Mushtak . Experimental Investigation of the Use of Synthetic Jets for Mixing in Vessels . Journal of Fluids Engineering . ASME International . 133 . 9 . 2011-09-01 . 0098-2202 . 10.1115/1.4004941 . 2014-02-07 . 2014-02-23 . https://web.archive.org/web/20140223004547/http://fluidsengineering.asmedigitalcollection.asme.org/article.aspx?articleid=1439115 . live .

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