Hollow fi ber membrane contactors (HFMCs) for degasifi cation off er several advantages, including compact design, reduced

power consumption, and higher mass transfer rate compared to conventional technologies. These characteristics make HFMCs

an ideal choice for applications such as ultrapure water production and wastewater treatment, where the removal of even

trace amounts of dissolved gases is critical. In this study, we conducted 3D computational fl uid dynamics (CFD) simulations

to explore the impact of geometric features on HFMC hydrodynamic performance. A scaled-down version of a commercial

module (3 M-Liqui-Cel ™ ) was used, preserving the actual dimensions and spacing of the hollow fi ber membranes. Four

diff erent confi gurations were considered in the simulations based on the presence of a baffl e and variations in the size and

arrangement of liquid distributors. Analyses of fl uid motion and pressure drop indicated that designs with larger distributors

and internal baffl es may reduce stagnation zones and promote more uniform fl ow distribution. At higher velocities,

multiple recirculation areas were observed within the domain, with the size and volume of these zones varying across the

diff erent designs. These enhancements, driven by velocity fl uctuations, vortex formation, and eddies, could potentially lead

to higher mass transfer rates, especially at elevated fl ow rates. Additionally, the swirling arrangement of distributor holes

in varied sizes yielded the lowest pressure drop for all fl ow rates studied, off ering benefi ts in reduced energy consumption

and increased operational effi ciency. Our simulation results highlight the potential of optimized distributor hole sizes and

patterns to enhance fl ow mixing and minimize pressure drop.