Analysis,design and synthesis of water-based magnetorheological fluid for CMMRF process

Abstract

Abstract

A computational fluid dynamics (CFD) simulation has been performed to study the instability behaviour of water-based magnetorheological fluid (MR fluid) which is being used as a polishing medium of the chemo-mechanical magnetorheological finishing (CMMRF) process. This article deals with the flow behaviour of the dispersed solid phase in a continuous liquid phase due to the gravity-assisted flow, which results in sedimentation of the MR fluid with time.

In the present work, the causes of the fluid sedimentation have been identified through the CFD simulation. The sedimentation effect is minimized by nano-coating on iron particles using hydrocarbon chains through chemical reaction which is studied and analysed by using ab initio molecular dynamics simulation through density functional theory (DFT). The phenomenon observed through the simulation work is experimentally validated. The experimental results show that the MR fluid with nano-coating yields better stability against sedimentation.