Optimization of a dust concentration measuring device based on the Coanda effect

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.

The Research of the Active Cells Balancing by the Inductive Charge Transfer

With the development of the electric vehicles, serial connected cells have a broad prospect in the future. But the difference of the serial connected cells especially for Li-ion cells is prone to cause a lot of problems, such as overcharge and overdischarge. For these reasons, various cells balancing methods are applied. In this article main balancing methods will be compared, and as a result, the inductive charge transfer method will be adopted to balance the cells due to its obvious advantages. Furthermore, the principle and the realization of this balancing system will also be explained.