2010 Fiscal Year Final Research Report

Estimate of the Fluid Force Related to Washing Mechanism-Investigation of the Flow Behavior of Aqueous Solutions of Surfactants-

Research Project

Project/Area Number	20500663
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	General human life sciences
Research Institution	Iwate University
Principal Investigator	AMAKI Keiko Iwate University, 教育学部, 准教授 (80193019)
Project Period (FY)	2008 – 2010
Keywords	洗浄 / 界面活性剤水溶液 / 流体力 / 抗力 / 粘性 / 抵抗減少効果
Research Abstract	The effect of fluid force on detergency has been experimentally investigated. It was conducted on the flow of aqueous solutions of detergent through mesh screens to mimic cloth washing. Pressure losses across the mesh screens were measured for water, dilute polymer and several aqueous surfactant solutions. A reduction of pressure losses was observed for the flow of aqueous solutions of surfactants, but not for the dilute solutions of polymers, through mesh screens. On the other way, viscosity of solutions was measured. For all solutions used, the viscosity increase with an increase of concentration. And it decreases with an increase of temperature. So the results of viscosity are different from those of drag. These mean that aqueous solutions of surfactants provide an effect to reduce the drag of flow through yarns or fibers and to increase the flow rate, resulting in easier removal of soil than in water, as well as the effect to lesson the chemical potential between soil and substrate.

(4 results)