Figure 1.

The experimental setup used for evaluating the effect of forced airflow on the mass transfer coefficient in a 190 L metal box connected to a metal tube (different diameters and lengths). A 12 mm × 12 mm × 3 mm blower with the flow rate of 2.7 L min⁻¹ operated by an Arduino UNO was installed in an opening of the box to facilitate forced airflow. Changes in the O₂ and CO₂ concentrations were measured using a modular sensor system (RMS88) that transferred data in real time to the gassensor software on a laptop.