Nano-scale Hot Wire Sensors for Turbulence Measurement Applications

Abstract In this paper hot wire sensors for turbulence measurement were developed, which mainly consisted of free-standing nano-scale platinum wires. Specific spatial 3D arrangements of these sensors enable measurements of quantities of small turbulence structures, such as velocity, shear stress and vorticity, in the three dimensions. To decrease the filter effect at moderate and high intensity of turbulence, more over, to detect small structure in the turbulent flow, the characteristic size of the sensor was minimized to 260 nm. TCR (temperature coefficient of resistance) of the sensors are characterized and reached typically 0.217%/K.