Quality Waterjet Newsletter 01/05/2010

Cleanability Factor


The terminology of machinability has been used in the abrasive waterjet cutting technology for many years. A similar terminology for the cleaning industry was also proposed by Conn et al.* back in 1987. The intention was to standardize the relative ability of a water jet for cleaning applications. A parameter called “cleanability factor” or “erosion strength for cleanability”, Sc, was used to define the combined character of the substance-to-be-removed and the substrate-to-be-cleaned. A term called “area cleaning effectiveness”, ea, was defined as:


ea = Area cleaned per unit time / Power delivered by the nozzle.


It was proposed that for a given nozzle and a fixed set of operating conditions, the value of ea is inversely proportional to that of Sc.  The following log-log graph was created based on some pre-existing test data. It shows that the values for comparable substances to be cleaned tend to group closely together. The authors pointed out that this approach was at a very preliminary stage and encouraged further research in this direction.


*Conn, A.F., Gracey, M.T., and Rosenberg, W. (1987) A relative cleanability factor, Proceedings of the fourth U.S. water jet conference, the University of California, Berdeley, August 26-27, 1987, pp 212-216.




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