Apparatus and methods for the calibration and correction of a polydispersed dust feeding system applied in multiphase flow experiments

Multiphase flow experiments allow the understanding of complex interaction mechanisms between particles and fluid structures under controlled conditions. In standard test rigs, the airflow is mixed with precise dust amount continuously, and accurate knowledge of the aerosol amount injected is mandatory to achieve reliable measurements and results. This work proposes the experimental procedure for calibrating an aerosol dosing and injection system. The purpose-built calibration system layout is explained in detail. To give a general perspective of the procedure, four test powders commonly used in multiphase flow tests have been used: Alumina, Silicon Carbide, and two grades of standard soil named Arizona Road Dust. Methodologies and criticisms are reviewed and assessed, and the final results are given in the form of calibration curves of the feeding system. Since the proposed correction is based on powder and flow characteristics, the proposed methodology can be applied to several cases and conditions.