Research Data
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Path Instabilities of a Freely Rising or Falling Sphere

International Journal of Multiphase Flow

Authors:
Shravan K. R. Raaghav
Christian Poelma 
Wim-Paul Breugem

Corresponding author: Wim-Paul Breugem (w.p.breugem@tudelft.nl)

Laboratory for Aero & Hydrodynamics, Process & Energy Department,
Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands


General Introduction
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The data in this repository is the experimental data accompanying the figures presented in the article "Path Instabilities of a Freely Rising or Falling Sphere" published in International Journal of Multiphase Flow. 

The experiments were carried out during the period of the Master thesis (December 2018 - November 2019) of Shravan K.R. Raaghav. The experiments were performed at the Lab of Aero- and Hydrodynamics at Delft University of Technology. This work was supervised by Dr.ir.Wim-Paul Breugem and co-supervised by Prof.dr.ir.Christian Poelma. The details regarding the experimental campaign and data processing can be found in the research article and the underlying Master thesis. In order to avoid any misalignment of the tabular data in the ".txt" files given in this repository, make sure to turn off "Word Wrap" and maximize the file to full screen.

This dataset is being made public to serve as supplementary data for the paper "Path Instabilities of a Freely Rising or Falling Sphere". Other researchers may use this data in their own work (CC BY 4.0). The dataset is available at the 4TU.Centre for Research Data via: https://www.doi.org/10.4121/19742509.


Description
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In this repository you have the following files:
1) Particle Trajectories Data
The data corresponding to the figures in the article is provided. A total of 21 ".txt" files is given. The naming of the files is also based on the figure number in the article and the regime observed.
Here you can find the raw x, y, z coordinates of the particle trajectory. Also, you can find the position and velocity data obtained post the signal processing/filtering. The physical parameters such as Ga, rho_bar, Re, Cd, mean velocity components etc. are also provided. The nomenclature used is the same as that in the article. Each ".txt" file corresponds to a figure in the article and is named in the following manner : "Fig.no - Name of Regime (Rising/Falling).txt". 


2) Consolidated Data 
Here you can find the data of Ga, rho_bar, Re, Cd, the corresponding uncertainties and the sphere density. These are the data used to construct the regime maps and the Cd vs Re plots in the article. The data from the entire experimental campaign is consolidated and categorized regime wise. There are 2 ".txt" files, first one being the falling cases data and the second one being the rising cases data.  The 2 files are named : "Consolidated Data - Falling Cases.txt" and "Consolidated Data - Rising Cases.txt".


3) Videos of Particle Trajectories
Here you can find the videos (".MP4" format) of all the particle trajectories that are presented in the article. The files are named in a descriptive manner for easy recognition of the regime, properties and the corresponding figure in the article. A total of 21 videos is given is named in the following manner : "Video-Name of Regime-Rising/Falling (Article Fig.no), Ga-xx,rho_bar-xx-.mp4"


