Hydrodynamics in a bubble column – Part 1: Two-phase flow

Multiphase computational fluid dynamics (CFD) simulation is a useful tool to study the hydrodynamics in a bubble column, if appropriate closure models are known. Systematic assessment of different models is an ongoing venture that benefits from improved validation data. The present study accumulates a database on two-phase flow experiments in a bubble column. This is achieved by using a combination of Particle Image Velocimetry and Shadowgraphy to measure the liquid velocity field and gas dispersion properties simultaneously. This methodology is applied for different needle diameters and gas flow rates.

A detailed description of the experimental setup can be found in Sommer et al. (2023).

The experimental data (Table 1) described in this repository is structured into different folders and files as follows:<br>
Level 1: Folders classified by measurement configuration: <strong>TX_Jg_Y_Di_ZZZ</strong> as outlined in Table 1

<strong>TX</strong> = Identifier
<strong>Jg_Y</strong> = Superficial gas velocity in mm/s
<strong>Di_ZZZ</strong> = Inner diameter of the needle in µm

Level 2: Folders classified by measurement height: <strong>Z_XXX</strong>

<strong>Z_XXX</strong> = Measurement height in mm

Level 3: csv files classified by their analysis parameter:

Gas_Eg_ub_over_x.csv: Each csv file consists of five columns, namely the x-coordinate (in m), the gas holdup, the uncertainty of the gas holdup, the averaged bubble rising velocity (in m/s) and the corresponding uncertainty (in m/s).
Liquid_v_z_over_x.csv: Each csv file consists of three columns, namely the x-coordinate (in m), the averaged liquid velocity (in m/s) and the corresponding uncertainty (in m/s).

Table 1: Overview of the measurement cases in this repository.

<pre><code class="language-markdown">| ID | Diameter of needle orifice in µm | Superficial gas velocity in mm/s |
|----|----------------------------------|----------------------------------|
| T1 | 200 | 2 |
| T2 | 200 | 4 |
| T3 | 200 | 6 |
| T4 | 600 | 2 |
| T5 | 600 | 4 |
| T6 | 600 | 6 |</code></pre>