# Dataset for "Impact of viscoelastic polymer solution droplets on a granular bed"

## Overview

This dataset contains the experimental data used in the manuscript. The data include droplet impact conditions, fluid properties, dimensionless numbers, crater measurements, morphology classification, and rheological measurements of the PEO solutions.

The main dataset is provided in `all_impact_run.csv`. This file is self-contained and includes the fluid properties and dimensionless numbers used for each impact experiment. Therefore, separate files for fluid properties or relaxation times are not provided.


## Contents

- `data/`: all csv or xlsx files to read the raw data
- 'code/': MATLAB scripts used to compute dimensionless numbers, fit transitions, and generate plots.
- `figures/`: Figures used in the manuscript

## all_impact_run.csv
Typical columns include:

- `Run_id`: unique identifier for each experiment
- `Fluid`: fluid type
- `PEO_wt_percent`: PEO concentration in wt percent
- `water_wt_percent_in_solvent`: water fraction in the water-glycerol solvent, in wt percent
- `glycerol_wt_percent_in_solvent`: glycerol fraction in the water-glycerol solvent, in wt percent
- `H_cm`: Drop falling height
- `d0_mm`: initial droplet diameter. unit:mm
- `U0_m_s`: impact velocity. unit: m/s
- `rho_kg_m3`: liquid density unit:kg/m^3
- `sigma_N_m`: liquid-air surface tension unit:N/m
- `mu_eff_Pa_s`: viscosity used for calculating dimensionless numbers (effective viscosity) unit:Pa*s
- `lambda_s`: relaxation time used for the PEO solutions unit:s
- `We`: Weber number
- `Re`: Reynolds number
- `Oh`: Ohnesorge number
- `De`: Deborah number
- `Dc_mm`: final crater diameter (outer edge) unit: mm
- `dmax_mm`: max drop spreading diameter unit: mm
- `Dinner_mm`: inner morphology size unit: mm
- `morphology`: crater morphology classification
- `timb_s`: static liquid imbibition timescale into granular bed. unit:s


## particle_size_distribution.csv
Typical columns include:

- `Particle_size_um`: particle size distribution of granular bed. unit: um (You can draw a histogram)


## Rheology_PEO.csv
Typical columns include:

- `PEO_wt_percent`: PEO concentration in wt percent
- `shear_rate_s^-1`: shear rate measured at rheometer. unit: 1/s
- `viscosity_mPa_s`: measured PEO viscosity by rheometer. unit: mPa*s

## representative_crater_topology_byKeyence_Bowl_PEO_1percent_7_66cm.csv

Surface height map of the final crater morphology measured by laser profilometry. Each value in the matrix represents the local vertical displacement, `z`, of the granular bed surface relative to the initial flat bed surface. Rows and columns correspond to the horizontal `y` and `x` directions, respectively, with a spatial spacing of 0.05 mm between neighboring cells.

A representative case: 4M PEO 1% case at H=7.66cm

## Reproducing the figures

The MATLAB codes used to generate the figures in the manuscript are included in the `code` folder. All source data files loaded by these scripts are included in the `data` folder.

To reproduce the figures, open the corresponding MATLAB script and modify the `folderPath` variable to point to the local location of the `data` folder. The scripts can then be run directly in MATLAB to generate the figures.