caa a22 4500 606196978 CHVBK 20210128100927.0 cr unu---uuuuu 210128e20150101xx s 000 0 eng 10.1007/s00348-014-1863-9 doi (NATIONALLICENCE)springer-10.1007/s00348-014-1863-9 Three-dimensional investigation of liquid slug Taylor flow inside a micro-capillary using holographic velocimetry [Elektronische Daten] [Dhananjay Singh, P. Panigrahi] Digital holography is an optical technique which is capable of providing instantaneous three-components of fluid flow velocity in three-dimensions (3D-3C) using a single camera. Digital holographic microscopy has been implemented in the present study to analyze liquid slug Taylor flow in a micro-channel of cross-sectional dimensions of 1,000×1,000µm2. The working fluids are water (liquid) and air (gas), with superficial velocities of liquid, U L=0.6mm/s and gas, U G=1.2mm/s, respectively. The corresponding Capillary number, Ca=0.035×10−3 and Bond number, Bo=0.144. The holographic velocimetry technique has been implemented and appropriately validated by comparing the velocity profile from present experiment with that from analytical velocity profile for single-phase flow. Complete flow field results, i.e., u-, v- and w-components of velocity inside the liquid slug volume, i.e., in both streamwise (x-y) and cross-stream (y-z) planes are presented. The present experiments on liquid slug Taylor flow show strong cross-stream velocity near the advancing and receding meniscus due to higher capillary pressure. The stream traces show converging and diverging radial flow in the cross-stream plane near the receding and advancing meniscus, respectively. Two three-dimensional recirculation bubbles are observed inside the liquid slug. Overall, this paper reports the complex three-dimensional flow field inside a liquid slug Taylor flow from the 3D-3C flow field measurements. Springer-Verlag Berlin Heidelberg, 2014 Singh Dhananjay Department of Mechanical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, UP, India aut Panigrahi P. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, UP, India aut Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-15 0723-4864 56:1<1 2015 56 348 https://doi.org/10.1007/s00348-014-1863-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-014-1863-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Singh Dhananjay Department of Mechanical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, UP, India aut NATIONALLICENCE 700 1- Panigrahi P. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, UP, India aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/1(2015-01-01), 1-15 0723-4864 56:1<1 2015 56 348