Supplements to

"Measurements and High-Speed Visualizations of Flow Boiling of a Dielectric Fluid in a Silicon Microchannel Heat Sink" submitted to International Journal of Multiphase Flow by

Tailian Chen and Suresh V. Garimella

Cooling Technologies Research Center
School of Mechanical Engineering
Purdue University
West Lafayette, IN 47907-2088
Movie Clips of Flow Boiling in Silicon Microchannels
Please contact Dr. Garimella for any questions, email:

The following visualization results were obtained in a silicon microchannel heat sink (12.7mm by 12.7 mm) containing 24 parallel microchannels, each 389 um wide and 389 um deep.  The flow rate is 47 mL/min.  Visualizations were performed at the rate of 12,500 frames per second.

(This page is better viewed using Internet Explorer. To play the movies, please place mouse over the images)

Flow is from right to left  in all movies

 Bubbly to slug flows 
(in the downstream) 

9.4 W/cm2

18.9 W/cm2

26.9 W/cm2

31.2 W/cm2

36.0 W/cm2

38.3 W/cm2


Flow boiling with instabilities

(42.7 W/cm2)

 Wispy-annular/churn flow in the downstream

Flow reversal in the upstream

Flow boiling at higher heat fluxes

(in the downstream)

61.7 W/cm2