It should be noted that the literature survey in this paper  is greatly lacking. Moreover, the fundamentals of gas-lubricated tribo-elements are grossly overlooked or even misunderstood, pointing first to the theoretical background which in its entirety can be found elsewhere [2–8]. The authors do not explain how they enforce mass flow continuity across groove-land borders (see Refs. [4–6]). In fact, the authors use a successive over relaxation (SOR) method, i.e., using a finite difference scheme that by definition contains singularities in the derivatives of the film thickness as imbedded in Eq. (4)—the authors do not explain how that is handled. The SOR method, which was popular in the 1950s or 1960s, is a method that is clearly unfit for spiral groove seals that contain film thickness discontinuities. Moreover, with or without spiral grooves, it...
Discussion: “A Multi-Objective Optimization Approach on Spiral Grooves for Gas Mechanical Seals” (Wang, X., Shi, L., Huang, W., and Wang, X., 2018, ASME J. Tribol., 140(4), p. 041701)
Georgia Institute of Technology,
Atlanta, GA 30332
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 20, 2018; final manuscript received June 26, 2018; published online October 24, 2018. Editor: Michael Khonsari.
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Green, I. (October 24, 2018). "Discussion: “A Multi-Objective Optimization Approach on Spiral Grooves for Gas Mechanical Seals” (Wang, X., Shi, L., Huang, W., and Wang, X., 2018, ASME J. Tribol., 140(4), p. 041701)." ASME. J. Tribol. February 2019; 141(2): 025501. https://doi.org/10.1115/1.4041075
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