The unsteady low Reynolds number aerodynamics of flapping flight was investigated experimentally through flow visualization by suspended particle imagery and wall shear stress measurement from micro-array hot-film anemometry. In conjunction, a mechanism was developed to create a flapping motion with three degrees of freedom and adjustable flapping frequency. The flapping kinematics and wing sha...

Quantitative application of digital in-line holography (DIH) to characterize multiphase fragmentation is demonstrated. DIH is applied to record sequential holograms of the breakup of an ethanol droplet in an aerodynamic flow field. Various stages of the breakup process are recorded, including deformation, bag growth, bag breakup, and rim breakup. A recently proposed hybrid method is applied to ...

Development of a low-cost computer-based system for multi-point measurement of velocity and temperature has been completed. The principle is based on hot-wire anemometry. A typical probe consists of a cold thermistor for flow temperature detection and a hot thermistor for flow velocity detection. The later is selfheated by a thermal potentiometer circuit. The change in resistance of the thermis...

The effect of end conduction on constant temperature hot-wire anemometry was studied. A new parameter, = ( /d)√4a(kf /k)Nu, is proposed to describe the significance of end conduction more comprehensively than the commonly used length-to-diameter ratio /d, in that it allows for material property variations, resistance ratio and Reynolds number effects. Numerical and experimental data are used to...

The study of naturally occurring turbulent flows requires ability to collect empirical data down the fine scales. While hotwire anemometry offers such ability, open field studies are uncommon due cumbersome calibration procedure and operational requirements anemometry, e.g., constant ambient properties steady flow conditions. combo probe-the combined sonic-hotfilm anemometer developed tested ov...