Study on the spatial filtering and sensitivity characteristic of inserted electrostatic sensors for the measurement of gas-solid two-phase flow parameters

► Establishes a new mathematical model for an inserted electrostatic sensor. ► Obtains some characteristics of the probe from simulations and discusses them using experiments. ► Discusses the depth L of the inserted probe using simulations. ► Obtains a new velocity measurement method by analyzing the probe response characteristic. ► Measures and obtains the fluid velocity of free falling sand using this new method.