Experimental study of the application of micro-PIV on the flow characteristics detection of micro-gap rotational flow field

Abstract

For a micro-gap rotational flow field with a large horizontal extent, tiny gap and fast flow velocity, the two-dimensional images shot by the micro-scale Particle ImageVelocimetry(Micro-PIV) technique are not sufficient for the study of local or whole flow characteristics. In this paper, by establishing a test bench of a rotational flow field with the functions of driving, positioning, adjustment and sensing, all the local states of the micro-gap rotational flow field can be obtained by horizontally moving the rotating axis to observe point by point. While measuring some local flow fields, two-dimensional pictures are taken by adjusting the focusing height of the objective lens, and then superposed and interpolated according to their shooting order to obtain a quasi-three-dimensional distribution image of the local flow fields, thus obtaining the flow condition of the vertical section of the flow field. The position of the focusing plane and mutual distance are adjusted to realize the measurement of wall shear force in the flow field, providing a feasible reference method for detecting the rheological property of the gap flow field and the effect of surface drag reduction.

Preface: Micro-Nano Technology

“…17 Besides, theoretical and experimental research on the influence of multiple piezoelectric effects to physical parameters of piezoelectric actuator is also introduced. 18 In the field of Micro-fluidics, three studies involving a zero-flow micro fluidics for long-term cell culture and detection, 19 the application of micro-PIV on the flow characteristics detection of micro-gap rotational flow field, 20 and super cooling and cold energy storage characteristics of Nano-media in ball-packed porous structures are presented. For the Bio MEMS and Applications, the investigations of composite vascular repair grafts via Micro-imprinting and electrospinning 22 and piezoresistive Micro cantilever aptasensor for ricin detection and kinetic analysis are reported.…”