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Basing on the theory of new sine gears and gear train principle, established the main body structure for the new sine gears of flow meter. According to the working principle of the new flow meter, deduced the flow rate function and the flow pulsation rate function. In explanation of the using prospects for the new flow meter, simulated the flow pulsation with MATLAB and compared with normal gears flow meter. The outcome indicated that the new sine gears of flow meter was smaller than the normal gears flow meter in terms of flow pulsation, thereby proved the likelihood of using in high voltage flow measurement. Keywords-new sine gears of flow meter; flow rate function; flow pulsation function; MATLABI.

Purpose This paper aims to clarify the fluid infiltration mechanism at the micro-contact zone boundary of rubber-glass interfaces. Design/methodology/approach An in situ observation instrument was putted up; then the fluid infiltration process was recorded. Experimental results indicated that the fluid infiltration was more likely to occur in a high-contact-area-ratio zone, and the path order of fluid infiltration was first inner normal to the boundary of micro-contact area, and then along the boundary, at last external normal to the direction of boundary. Findings By analysis, capillary pressure is the driven force of fluid at interfaces. The micro-channel size at higher-contact-area-ratio zone is smaller, and the capillary pressure is bigger. Moreover, along different section directions of wedge-shaped region, the horizontal driving force of fluid is different due to difference of conical angle. Originality/value The main contribution of this study is proposing a new wedge-shaped model for better understanding the phenomena of fluid infiltration at rubber contact interfaces. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0453