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Sliding and sticking vapour bubbles under inclined plane and curved surfaces.

Author(s) : YAN Y., KENNING D., CORNWELL K.

Type of article: Article, IJR article

Summary

In flow boiling heat is transferred by the combined effects of nucleate boiling, with local generation of bubbles, and evaporatative and convective cooling by the passage of bubbles generated elsewhere. In the paper, nucleate boiling was eliminated by measuring the heat transfer near injected steam bubbles sliding under an inclined plate heated to low superheats, using liqud crystal thermography combined with high speed video recording and computerised image analysis. Heat was transferred by evaporation on the thin liquid film between the bubble and the wall and by enhanced convection in a wake region wider than the bubble and many bubble diameters long. Evaporation was the dominant mechanism for large, easily deformed, slow-moving bubbles. For small, faster-moving bubbles the reduction in evaporation was offset by an improvement in convection.

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Pages: 583-591

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Details

  • Original title: Sliding and sticking vapour bubbles under inclined plane and curved surfaces.
  • Record ID : 1998-2206
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 20 - n. 8
  • Publication date: 1997/12

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