Abstract
The fluid leakage channel found in contact mechanical seals belongs to the microchannel category. Thus, upon further inspection, the influence of surface wettability and other factors neglected in previous studies becomes obvious. The porous leakage model of contact mechanical seals considering the surface wettability presented in this paper was based on the Cassie model and slip theory. The variations of the microchannel slip length and the velocity under various wettability conditions were studied and the relationship between the slip length and the apparent contact angle was established. Moreover, using porous media theory, the theoretical model of the leakage rate in contact mechanical seals considers the surface wettability depending on various parameters. The observed parameters included the surface contact angle, sealing medium pressure, viscosity coefficient, fractal dimension, and maximum pore diameter. The simulation results obtained using the proposed model have shown that the leakage rate increases with the increase of the apparent contact angle. Particularly when the contact pressure is small, the influence of the surface wettability is more significant. Furthermore, the leakage rate results obtained via the proposed model were compared to those of existing models. The comparison confirmed that the proposed model is applicable and that the necessity of considering wettability significantly affects the leakage rate calculation accuracy. The proposed model lays a foundation for further improving the calculation accuracy, making it easier for both the researchers and practitioners to suppress the leakage in contact mechanical seals.
Highlights
They remain in the focus and research hotspot of both the scholars and engineers around the world [1,2,3], and Fan et al [4] thinks that the leakage failure of contact mechanical seals is still common
Gu [5] noted that to effectively control and reduce the leakage of contact mechanical seals, it is necessary to focus on the main leakage channel formed between the end faces of the dynamic and static rings
Using the boundary slip theory increase in surface area relative to volume. This and reason, a contact mechanical seal throughrate establishing the relationships slip was length and surface apparent leakage model considering surfacebetween wettability established in this paper.contact
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Some of the factors generally neglected in macro suchchannel as surface and interface surface tension, become critical due level, to the Theflow, leakage sizewettability at the sealing is generally in the micron increase in surface area relative to volume For this reason, a contact mechanical seal belonging to the microflow category. Using the boundary slip theory increase in surface area relative to volume This and reason, a contact mechanical seal throughrate establishing the relationships slip was length and surface apparent leakage model considering surfacebetween wettability established in this paper.contact. It is expected that the study at hand can provide model was based on the model developed by Ni et al [26] and using the boundary slipa foundation for establishing further calculation and suppression of the contact mechantheory through the relationships between slipleakage length rate andof surface apparent ical seals. It is expected that the study at hand can provide a foundation for further calculation and suppression of the leakage rate of contact
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