µPIV measurement of the 3D velocity distribution of Taylor droplets moving in a square horizontal channel

µPIV measurement of the 3D velocity distribution of Taylor droplets moving in a square horizontal channel

Mießner, Ulrich (University of Bremen)
Helmers, Thorben (University of Bremen)
Lindken, Ralph (Bochum University of Applied Sciences)
Westerweel, J. (TU Delft Fluid Mechanics)

2020

Abstract: This paper presents a µPIV measurement of the 3D2C velocity distribution of Taylor droplets moving in a square horizontal microchannel at Ca_c= 0.005 and Re_c= 0.051. We reconstruct the third velocity component and present an accuracy assessment of the reconstruction based on a volume flow balance of the 3D3C velocity field. The velocity field allows the investigation of the 3D flow features such as stagnation regions and the shear rate distribution. The maximum shear rate is located at the entrances and exits of the wall films and at the corner flow (gutter) bypassing the Taylor droplet. The regions of high strain correspond to the cap positions of the Taylor droplets. An experimental data set allows visualization of the streamlines of the velocity distribution on the interface of a Taylor droplet and to directly relate it to the main and secondary vortices of the droplet phase velocity field. The measurement data are provided as a digital resource for the validation of numerical simulation or further assessment. Graphic abstract: [Figure not available: see fulltext.]

http://resolver.tudelft.nl/uuid:1a8bc8d1-ec46-4ef6-a74e-719f9b7eb14a

https://doi.org/10.1007/s00348-020-02949-z

0723-4864

Experiments in Fluids: experimental methods and their applications to fluid flow, 61 (5)

Institutional Repository

journal article

© 2020 Ulrich Mießner, Thorben Helmers, Ralph Lindken, J. Westerweel