Boiling heat transfer in mini-channels: influence of the hydraulic diameter
Résumé
The present experimental study shows how the reduction of the hydraulic diameter affects the heat transfer coefficient
for a boiling flow in mini-channels. Flat aluminium multipart extruded tubes composed of parallel rectangular channels
with hydraulic diameters 0.77 and 2.01 mm were used with refrigerant Rl34a. It was shown that the reduction of the
hydraulic diameter increased the heat transfer coefficient and favored dry-out, probably because of the thinning of the
liquid layer due to the bubble confinement. However it was found that the quality averaged heat transfer coefficient
was still greater than what would be obtained in macro-tubes.
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