Circulation Cleaning. II. Effects of Entrained Air

Abstract

Dissolved and foam-occluded air would effect the viscosity and density, hence the turbulence, of the circulating medium. The effect of controlling these variables by antifoam additions was investigated. In the presence of compounded detergents, these additions were essentially without effect on the pressure side of the system, and inhibited cleaning on the vacuum side. The inhibition was ascribed to limitation of the scrubbing action of occluded air and bubbles. It was demonstrated that cleaning is more effective on the vacuum side, and that the effectiveness is further increased by permitting air to leak into the system.