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Communication Dans Un Congrès Année : 2003

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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Dates et versions

hal-00200276 , version 1 (07-02-2020)

Identifiants

  • HAL Id : hal-00200276 , version 1

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Bruno Agostini, André Bontemps, Barbara Watel, Bernard Thonon. Boiling heat transfer in mini-channels: influence of the hydraulic diameter. 21st International Congress of Refrigeration, Aug 2003, Washington, United States. ⟨hal-00200276⟩

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