The flow of a dense slurry where the filling particles are heavier than the liquid carrier is analyzed by considering the particle-particle and particle-wall interactions, which were derived from fluid film lubrication theory. The effect of settlement causes the flow behavior to depart from that of slug flow (described in [1], also submitted to this Congress). It is found that steady flow is still possible, and, for a few representative packing patterns considered, somewhat modified patterns exist. An ongoing under-fill flow experiment aimed at validating the above theoretical results is described.
Volume Subject Area:
Electronic and Photonic Packaging
1.
Yang, R., Sun, D. C. and Park, Seungbae, “A Model of Shear Viscosity for Under-fill Flows,” Submitted to IMECE2005 for presentation and publication.
2.
Washburn
E. W.
1921
, “The Dynamics of Capillary Flow
,” Physical Review
, Vol. 17
, pp. 273
–283
.3.
Han, Sejin, Wang, K. K., and Cho, Sung-Yong, 1996, “Experimental and Analytical Study on the Flow of Encapsulant during Underfill Encapsulation of Flip-Chips,” Electronic Components and Technology Conference, Orlando, FL, May 28–31, 1996, pp. 327–334.
4.
Nguyen, L. T., Chen, A. S., Krishnan, A., Bayyuk, S. A., Lowry, S. A., Przekwas, A. J., and Bidstrup-Allen, S. A., 1997, “A CAD-Based Flow Modeling Tool for Plastic IC Encapsulation,” InterPack 97, Hawaii, June, pp. 15–19.
5.
Mathcad 6.0 Users Guide, Mathsoft Inc.
6.
Yang, R., 1998, Modeling the Flow of a Dense Slurry between Two Parallel Walls, M.S. thesis, State University of New York at Binghamton.
7.
Leighton
D.
Acrivos
A.
1987
, “Measurement of Shear-Induced Self-Diffusion in Concentrated Suspensions
,” J. Fluid Mech.
, Vol. 177
, pp. 109
–131
.8.
Leighton
D.
Acrivos
A.
1987
, “The Shear Induced Migration of Particles in Concentrated Suspensions
,” J. Fluid Mech.
, Vol. 181
, pp. 415
–439
.9.
Averbakh
A.
Shauly
A.
Nir
A.
Semiat
R.
1997
, “Slow Viscous Flows of Highly Concentrated Suspensions - Part I: Laser-Doppler Velocimetry in Rectangular Ducts
,” Int. J. Multiphase Flow
, Vol. 23
, pp. 409
–424
.10.
Shauly
A.
Averbakh
A.
Nir
A.
Semiat
R.
1997
, “Slow Viscous Flows of Highly Concentrated Suspensions–Part II: Particle Migration, Velocity and Concentration Profiles in Rectangular Ducts
,” Int. J. Multiphase Flow
, Vol. 23
, pp. 613
–629
.11.
Leighton
D.
Acrivos
A.
1986
, “Viscous Resuspension
,” Chemical Engineering Science
, Vol. 41
, pp. 1377
–1384
.12.
Phillips
R. J.
Armstrong
R. C.
Brown
R. A.
Graham
A. L.
Abbott
J. R.
1992
, “A Constitutive Equation for Concentrated Suspensions that Accounts for Shear-Induced Particle Migration
,” Phys. Fluids, A
, Vol. 4
, January, pp. 30
–40
.13.
Guo, Y., Lehmann, G. L., Driscoll, T., and Cotts, E. J., 1999, “A Model of the Underfill Flow Process: Particle Distribution Effects,” 1999 Electronic Components and Technology Conference, pp. 71–76.
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