Synthetic Jet

A synthetic jet flow, or synjet, is a type of jet flow.

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. [ American Heritage Dictionary]

A "synthetic jet flow" synthesizes the flow from the surrounding or ambient fluid. Normally, producing a jet requires an external source of fluid, such as piped-in compressed air or plumbing for water.

ynJet 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, TX-based company Nuventix [http://www.nuventix.com Nuventix - Active Thermal Management Hot Spot Cooling, Air Cooled Heat Exchangers: Nuventix ] ] , was patented in 2000 by engineers at Georgia Tech. [http://www.venturelab.gatech.edu/Portals/57/december12003.htm] 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 LED.

Synthetic jet modules have also been widely researched for controlling airflow in aircraft to enhance lift, increase maneuverability, control stalls, and reduce noise. Problems in applying the technology include weight, size, response time, force, and complexity of controlling the flows. [ [http://www.mrs.org/s_mrs/sec_subscribe.asp?CID=2619&DID=116064&action=detail MRS Website : Piezoelectric Actuators for Synthetic Jet Applications ] ] [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JFEGA4000129000007000825000001&idtype=cvips&gifs=yes] [ [http://sbir.nasa.gov/SBIR/abstracts/05/sttr/phase2/STTR-05-2-T2.02-9831.html Active Flow Control with Adaptive Design Techniques for Improved Aircraft Safety ] ] [www.patentstorm.us/patents/7159383-claims.html]

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. [http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/10495/33250/01570116.pdf?arnumber=1570116]

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