This paper deals with the optimization of a synthetic jet actuator parameters in the control flow around the NACA0015 airfoil at two angles of attack: 13° (i.e. the stall angle of NACA0015) and 16° (i.e. the post stall angle of NACA0015) to maximize the aerodynamic performance of the airfoil. Synthetic jet actuator is a zero mass flux-active flow control device that alternately injects and remo...

A liquid forced through an orifice into an immiscible fluid ultimately breaks into drops due to surface tension. Drop formation can occur right at the orifice in a dripping process. Alternatively, the inner fluid can form a jet, which breaks into drops further downstream. The transition from dripping to jetting is not understood for coflowing fluid streams, unlike the case of drop formation in ...

Inviscid two-dimensional (2D) fluid phenomena like hurricanes, jet streams, Jupiter’s Red Spot, and protoplanetary disks are quite common in Nature. Unfortunately, 2D fluid phenomena are difficult to study in the laboratory because the finite size of laboratory apparati commonly introduces unwanted viscous and friction effects. Magnetized electron columns, however, behave like twodimensional fl...

The suspension plasma spraying process is investigated by using shadow imaging techniques to appreciate the different trajectories of the liquid jet interacting with a DC highenergy plasma flow. Then, the modelling of different liquid injections (isolated droplet, train of droplets and continuous jet) helps to determine which injection type must be preferred. From that, coating depositions have...

[1] We have produced a map of velocity covering much of the Siple Coast ice streams. The map confirms earlier estimates of deceleration on Whillans Ice Stream. Comparison with bed elevation data indicates that subglacial topography and the location of consolidated sediment play a strong role in determining the location of the tributaries feeding the ice streams. Force balance estimates based on...

A 3-D microphone array was developed and used to locate the origins of individual sound waves that were created within a high-speed and high Reynolds number turbulent jet. In previous work by the authors, a linear array of microphones and simultaneous temporally resolved flow visualizations were used to determine the origin of individual sound waves and their generation mechanisms within the je...

Nehme, Rimma Ph.D., Purdue University, August 2009. Efficient Query Processing for Rich and Diverse Real-Time Data. Major Professors: Elisa Bertino and Elke A. Rundensteiner. In recent years, data streams have become ubiquitous as technology is improving and the prices of sensor, location-tracking and portable devices are falling. Examples of streaming data include observations from sensor netw...

in this paper, construction of triplet atmospheric plasma jet using argon, air, oxygen and nitrogen gases is reported. bactericidal effect of the plasma jet is also investigated. to that end, longitudinal geometric configuration for the electrodes was chosen because it would increase the jet length. electrical characteristics, jet length dependencies on the applied voltage and gas flow rate wer...

User generated content (UGC) is a valuable source for improving the coverage of events such as concerts, festivals or sports events. Integrating UGC in existing professional production workflows is particularly challenging in live productions. UGC needs to be checked for quality in this case, and metadata captured by the mobile device and extracted from the content are relevant for filtering th...

RFID technology is widely used in the fields of location and position awareness. The RFID data streams are uncertain and need accurate and timely processing, since they are influenced by many factors. We propose an uncertain data optimal algorithm for RFID data streams. By analyzing the existing deficiency in the conventional particle filter method, we use a method based on entropy to derive th...