Experimental study on the charging process of dust particles

Abstract

In this paper, a charging property measurement system for dust particles is developed that can reflect the particle collision process during real dust events. The experimental results show that with the increase of the incident velocity (v_imp) of the impact particles and the particle size ratio (λ), the charge-to-mass ratio (q) of the impacted particle decreases. Upon comparing our results with existing experimental data, we observed that when the impacted particle is constrained, there is a possibility that the particle's q may be underestimated, and furthermore, there exists a qualitative difference in how q varies with the impact velocity (v_imp). Based on the capacitor model, this paper presents a charge model of dust particles considering the v_imp and λ. The representation equation of the parameter K_Q in the model is determined based on the experimental data using the least squares method, indicating that its representation reflects the influence of both v_imp and λ. Moreover, K_Q dominates the influence of v_imp on the q. The prediction results of the model are in good agreement with the experimental results.