ARTICLE:

• INFLUENCE OF HYDRAULIC DIAMETER ON FLOW CONDENSATION IN SILICON MICROCHANNELS  download article

Y. Chen
Southeast University, Nanjing, P. R. China; and Rensselaer Polytechnic Institute, Troy, USA

J. Li
Rensselaer Polytechnic Institute, Troy, USA

G. P. Peterson
Rensselaer Polytechnic Institute, Troy, USA

ABSTRACT

Condensation visualization experiments in <100> silicon triangular microchannels having hydraulic diameters of 250μm and 100μm were conducted to determine the influence of the hydraulic diameter and develop an accurate flow regime map. The results indicated that the behavior is periodic and that the intermittent frequency increases with decreases in the hydraulic diameter. The flow regime map is strongly influenced by the hydraulic diameter of the channel and at high cooling heat flux, for the 250μm channel, the flow map along the streamline was droplet-annular-injection-slug-bubble, while for the 100μm channel, the flow map along the streamline was annular-injection-slug. At low cooling levels, the 250μm channel exhibited a flow regime map that was droplet-annular, and the 100μm channel exhibited a flow regime map that was droplet-annular- fluctuant annular.

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