Mechanics of the Removal of Thickened Chemical Agents from Contaminated Surfaces by Wiping

摘要

The process of wiping a thickened chemical contaminant from a surface, where it has been inadvertently transferred and may pose a safety hazard, is investigated with regard to the fundamental fluid mechanics. Of special interest is the effect viscoelastic fluid behavior has on the process and specifically the amount of fluid remaining after wiping. Rigid aluminum blades of variable geometry, accurately positioned above a smooth rotating cylindrical surface, provide an experimental model of the process. Residual fluid thickness data as a function of blade height for newtonian liquids are compared to a simple lubrication theory model, while a more thorough Finite Element solution to the problem is planned for the future. Preliminary results indicate the potential to separate shear thinning and elastic effects experimentally through the proper choice of test fluids.