The experimental efficiency was numerically and experimentally studied for collecting negative and
positive ions in a coaxial cylindrical electrostatic collector for a mini-volume electrical PM detector. The
commercial computationalfluid dynamics software package COMSOL Multiphysics™was used to predict
the behaviors of theflowand electricfields as well as the particle trajectories in the collecting zone of the
ion collector. In the experiment, the ions were generated by a corona-needle ionizer with concentrations
greater than 10
13ions/m
3
, the positively and negatively applied voltages at the inner electrode ranged
from 0 to 45 V and the ionflow rates ranged from 1 to 5 L/min. For these ionflow rates, 1e5 L/min, the
ion precipitates due to space charge and diffusion effects ranged from 92 to 97 % for positive ions and 91
e97 % for negative ions. The total collection efficiency of the collector increased to 100% at collection
voltages larger than 5, 20 and 40 V respectively for the ionflow rates of 1, 3 and 5 L/min for both positive
and negative ions. Numerical calculation results of the ion trajectory in the collecting zone of the col-lector; showed good agreement with the experimental results of the total collection efficiency and can be
used to support the bettering of designing in order to refine an ion collector after the charger or ionizer in
a mini-volume electrical aerosol detector. Finally, this shows that this ion collector was proven to be
particularly useful as an electrostatic collector for positive and negative ions after the charger or ionizer
in a mini-volume electrical aerosol detector.