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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Variations of the loading capacity and friction force and friction factor on the inner wall of the FS with the width of the NFWG (n1 = 2000 rpm, δ = 3).