Micro Hot-Wire Anemometer

A promising device for measuring nanoscale and microscale channel flows is micro PIV, as mentioned in the previous Sect. How Characteristics in Microchannels. Santiego et al. [62] developed a micro PIV for measuring the instantaneous and mean liquid velocities around a circular cylinder of a diameter of 30 p,m placed in a microchannel. The diameter of the tracer particles ranged from 100 to 300 nm. Visualization of flow field in microchannels [63,64] and Brownian motion of a tracer particle [65] can also provide useful insight. Micro PIV is also used for observing the motion of blood cell in a capillary [66,67]. Micro hot-wire anemometer [68] and Doppler velocimetry [69] have also been recently developed for such studies in which bulk carbon nanotube were used as a wire. 

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