PIV and digital image analysis of direct ink writing with acoustophoresis and yield stress fluid support
Code and data for: "Changes in filament microstructures during direct ink writing with yield stress fluid support", Leanne Friedrich and Matthew Begley "Printing direction dependent microstructure in direct ink writing", Leanne Friedrich and Matthew Begley "Corner accuracy in direct ink writing with support material", Leanne Friedrich and Matthew Begley Videos were collected from underneath the print nozzle during direct ink writing of polymer matrix composites with acoustophoresis and yield stress fluid support. Particle image velocimetry and digital image analysis are used to characterize the flow field around the nozzle and particle distributions in the printed lines, via MATLAB. Data is analyzed and plotted using Mathematica. In the folder '32_16_3_2_combined', csv files show frame-by-frame results of PIV and digital image analysis measurements which indicate key metrics of the flow field and particle distributions in the region near the nozzle. In the folder 'Examplevids', mp4 files show a subset of the raw videos that the csv files come from, and csv files show timestamps for the beginning of each pass of each prism. In the file names, 'gras' indicates that videos were collected with a PointGrey Grasshopper camera. 'D2' indicates layer-by-layer support, 'D3' indicates bath support, and 'deep3' indicates a deep bath. 'deep3' data are not used in any of the papers. 'u8XX' indicates a UDMA-based ink with 8 wt% fumed silica in the UDMA-silica base and XX wt% TEGDMA in the base-TEGDMA-particles-photoinitiators ink. Polygons were printed on 4 pre-designed slides containing a specific set of polygons in specified locations. 'v_Y' indicates the translation and flow speeds were Y mm/s. '######_######' is a time stamp. 'prism#' indicates the prism number on the given slide. As noted, slides contain a specified set of polygons in a pre-set order. 32 px is the size of the PIV interrogation region. 16 px is the spacing between regions. 3 is the number of sequential frames to use in each PIV measurement. 2 is a vestigial data collection mode; PIV and particle distribution measurements were collected separately and then combined into single files. The folder 'MATLAB' contains the MATLAB '.m' functions and script used to measure flow fields and particle distributions and produce the tables in the folder '32_16_3_2_combined'. MATLAB files were written in MATLAB R2018b. The folder 'Mathematica' contains '.wl' packages and '.nb' notebooks used to analyze the files in the folder '32_16_3_2_combined' and to produce the files in 'Tables'. Files also contain the code used to produce the figures and tables in the three mentioned papers. Files were written in Wolfram Mathematica 11.1. The folder 'Tables' contains several summaries of the data. The README in that folder contains more description of the tables.