Self-syphonage is a major problem in plumbing design and so has been addressed in various codes by building services experts. This paper reports the results of experimental investigations carried out to determine the effect of viscosity and surface tension on the formation of vortices and eddies on flow characteristics within the trap and pipe, and most especially on trap seals. Within the range of the experimental results, viscosity and surface tension are insignificant factors for self-syphonage and residual seal depth analysis.
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