Date of Award

Spring 2000

Document Type

Dissertation

Degree Name

Doctor of Philosophy in Mechanical Engineering - (Ph.D.)

Department

Mechanical Engineering

First Advisor

Rajesh N. Dave

Second Advisor

Pushpendra Singh

Third Advisor

Robert Pfeffer

Fourth Advisor

Anthony D. Rosato

Fifth Advisor

Rong-Yaw Chen

Abstract

The objective of proposed research is to model, and understand the processes happening at multiple length and time scales in magnetically assisted impaction coating process. The smallest length scale is of the order of the molecular size and is important because during collisions the molecules rearrange themselves to form a semi-permanent bond between the core and secondary particles, which is studied by using the results of direct numerical integration of the governing Newton's equations. The effect of parameters such as size, orientation and relative velocity of particles on the collision mechanics is quantified. The largest length scale which is the device scale determines the magnetic field strength that is needed to fluidize the mixture. The intermediate length scale is of the order of particle size. The frequency of collision among the fluidized particles at this length scale determines the residence time required to coat the particles. The velocities and the normal force attained by the non-magnetic particles are estimated and compared with the same necessary for coating process. The deformation of the virtual guest particles are estimated from the normal force of collision of host particles and the van der Waal force of attraction is calculated. The attraction force is found to be more than the separation force of guest from the host, which is favorable for the coating process.

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