Title page for ETD etd-06132004-162417 ( Browse

Type of Document

Dissertation

Author

Desai, Salil S

Author's Email Address

ssdst9@pitt.edu

URN

etd-06132004-162417

Title

MULTIPHYSICS ANALYSIS AND OPTIMIZATION OF 3 DIMENSIONAL PRINTING TECHNOLOGY USING NANO FLUIDIC SUSPENSIONS

Degree

Doctor of Philosophy

Program

Industrial Engineering

School

School of Engineering

Advisory Committee

Advisor Name	Title
Dr. Michael Lovell	Committee Chair
Dr. Bopaya Bidanda	Committee Co-Chair
Dr. Laura Schaefer	Committee Member
Dr. Marlin Mickle	Committee Member
Dr. Ming En Wang	Committee Member

Keywords

3D Printing
Response Surface
Design of experiments
Multiphysics
Finite Element
CFD
Coupled Field
Nano Particulate
Optimization
Ultra-high speed photography

Date of Defense

2004-06-08

Availability

unrestricted

Abstract

Fabrication of micro and nano devices is of prime significance to the area of Micro-Electro-Mechanical Systems (MEMS). Attempts have been made to accommodate high performance devices in compact units, thus reducing their overall size. There exist a variety of microfabrication techniques including lithography, chemical vapor deposition, and LIGA that are used today. Manufacturing costs associated with these processes can be prohibitive due to cycle time and the precious material loss that occurs during etching operations. These drawbacks become more significant problem when building curved traces and support structures that most occur in 3D space.
To address the problems associated with building 3-dimensional circuits and devices in free space, a unique manufacturing process has been developed. This process utilizes conductive Nano-Particulate Fluid Jets (NPFJ) that are deposited onto a substrate by a Continuous Inkjet (CIJ) printing methodology. In this method, a fluid jet consists of colloidal suspensions of conductors and carrier fluids that are deposited onto a substrate and later sintered at high temperatures to form a homogeneous material. The major contribution of the present research is the investigation, development and optimization of the NPFJ. In this work, a Computational Fluid Dynamics (CFD) model has been developed to simulate the fluid jet and CIJ process. The modified CIJ printing process involves interaction of three domains namely, electrostatics, structural and fluidics. A coupled field analysis of the piezoelectric membrane that exists in the CIJ print head is conducted to establish the perturbation characteristics applied to the fluid. Interaction of the above three domains is captured within a single model using a (FSI) fluid-structural algorithm which staggers between domains until convergence is attained. A Design of Experiments approach was used to determine trends for the drop formations based on various exciting parameters. Results from these simulations have been validated using an ultra-high-speed camera featuring exposure/delay times from 100 nanoseconds at full sensor resolution.
The results of present research will give manufacturers the freedom to construct 3D devices and circuits that conform to the desired shapes and sizes of products, rather than being limited to present 2D components such as printed circuit boards.

Files

Filename		Size	Approximate Download Time (Hours:Minutes:Seconds)
Filename		Size	28.8 Modem	56K Modem	ISDN (64 Kb)	ISDN (128 Kb)	Higher-speed Access
	DesaiSalil20040806.pdf	2.91 Mb	00:13:29	00:06:56	00:06:04	00:03:02	00:00:15