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

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

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

Level 2: Folders classified by measurement height: Z_XXX

• Z_XXX = 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.

| 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                                |