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research-article

A further study on the analytical model for the permeability in flip-chip packaging

[+] Author and Article Information
X.J. Yao

Department of Material and Equipment Engineering, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China
xjyao@ecust.edu.cn

J.J. Fang

Department of Material and Equipment Engineering, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China
1152954298@qq.com

W.J. (Chris) Zhang

#School of Mechatronics and Automation, Shanghai University, Shanghai, China; Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, Canada
chris.zhang@usask.ca

1Corresponding author.

ASME doi:10.1115/1.4038391 History: Received February 12, 2017; Revised October 27, 2017

Abstract

The notion of permeability is very important in understanding and modeling the flow behavior of fluids in a special type of porous medium (i.e., the underfill flow in flip-chip packaging). This paper presents a new concept regarding permeability in a porous medium, namely two types of permeability: superficial permeability (with consideration of both the pore cross-section area and the solid matrix cross-section area) and pore permeability (with consideration of the pore across-section area only). Subsequently, the paper proposes an analytical model (i.e., equation) for the pore permeability and superficial permeability of an underfill porous medium in a flip-chip packaging, respectively. The proposed model along with several similar models in literature is compared with a reliable numerical model developed with the CFD (computational fluid dynamics) technique, and the result of the comparison shows that the proposed model for permeability is the most accurate one among all the analytical models in literature. The main contributions of the paper are: (1) the provision of a more accurate analytical model for the permeability of an underfill porous medium in flip-chip packaging, (2) the finding of two types of permeability depending on how the cross-section area is taken, and (3) the correction of an error in the other's model in literature.

Copyright (c) 2017 by ASME
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