access icon openaccess Local solid particle velocity measurement based on spatial filter effect of differential capacitance sensor array

This study proposes a novel velocity measurement method based on a differential capacitance sensor array (DCSA) for the solid particles in gas-solid flow. Firstly, the DCSA is modelled by the finite-element software ANSOFT, and its sensitivity characteristic is acquired. Additionally, the spatial filtering effect of DCSA is theoretically investigated, which validates the feasibility of particle velocity measurement based on DCSA. By measuring the frequency bandwidth (cut-off frequency) of the DCSA's output capacitance signal, the velocity of the local particles in the pipeline can be calculated. Further through the form of differential detection, the cut-off frequency can be accurately converged. Finally, a novel solid particle velocimeter based on DCSA is developed and tested on a gravity-delivery particle experimental device. The results indicate that the method has the feasibility for the velocity measurement and its repeatability is within 11% over the velocity range of 1–3 m/s.

Inspec keywords: capacitance measurement; computerised instrumentation; finite element analysis; velocimeters; velocity measurement; spatial filters; sensor arrays; capacitive sensors

Other keywords: DCSA output capacitance signal; velocity 1.0 m/s to 3.0 m/s; finite-element software ANSOFT; solid particle velocimeter; spatial filtering effect; gravity-delivery particle experimental device; differential detection; gas-solid flow; local solid particle velocity measurement method; differential capacitance sensor array

Subjects: Finite element analysis; Optical coatings and filters; Velocity, acceleration and rotation measurement; Impedance and admittance measurement; Sensing devices and transducers; Level, flow and volume measurement; Measurement instrumentation and techniques for fluid dynamics; Sensing and detecting devices; Numerical approximation and analysis; Velocity, acceleration and rotation measurement; Computerised instrumentation; Electrical instruments and techniques; Computerised instrumentation; Finite element analysis; Spatial filters, zone plates, and polarizers

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