Abstract
The accuracy of the existing dust measurement device comprising a straight pipe is not sufficiently high for low particle speeds. In this paper, a measuring pipe based on the Coanda effect is designed, an experimental model is established using Gambit 2.4, and a numerical simulation is performed using Fluent 6.3. In this way, speed nephograms at the middle section of the device pipe were obtained for different dust particle sizes. By comparing the velocity data of a devices comprising a straight tube, a venturi tube, or a Coanda tube, it was found that the velocity of the particles passing through the Coanda tube was higher than that for the other tubes. Therefore, the probability of frictional collision within the Coanda tube increases, thereby increasing the inductive charge of the particles. By calculating the electrostatic induction of the particles using MATLAB, it was found that the charge carried by the particles in the improved device significantly increased (25% on average). It is concluded that these findings are of significance for designing the structure of novel dust concentration measurement devices.
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