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Journal of Enhanced Heat Transfer
Импакт фактор: 1.406 5-летний Импакт фактор: 1.075 SJR: 0.287 SNIP: 0.653 CiteScore™: 1.2

ISSN Печать: 1065-5131
ISSN Онлайн: 1026-5511

Выпуски:
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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2012004080
pages 379-395

THE ENHANCEMENT EFFECTS OF A PLUME OF RISING BUBBLES ON NATURAL CONVECTION FROM A HEATED VERTICAL PLATE

David Donoghue
Department of Mechanical & Manufacturing Engineering, Trinity College Dublin, Ireland
Brian Donnelly
Department of Mechanical & Manufacturing Engineering, Trinity College Dublin, Ireland
Darina B. Murray
Department of Mechanical and Manufacturing Engineering, The University of Dublin, Trinity College, College Green, Dublin 2, Ireland

Краткое описание

Rising bubbles have been found to significantly enhance heat transfer from a heated surface. This is associated with the bubble acting like a bluff body, displacing fluid as it moves, and also via the wake generated by the bubble, which increases fluid mixing. The present research explores the motion of both a single ellipsoidal bubble and a plume of rising bubbles and their influence on heat transfer from a heated vertical surface. Prior to this, the effect on heat transfer of a stream of bubbles rising past a vertical surface has received little attention. By simultaneously measuring the time varying heat transfer via a hot film sensor and the bubble dynamics by means of high speed cameras, an improved understanding of the heat transfer mechanism is achieved. It was found that a bubble mean path normal to the heated surface produced higher initial enhancements in heat transfer when compared to bubble motion in a plane parallel to the surface, although this effect was insignificant when a plume of bubbles was investigated.

Ключевые слова: bubble, heat transfer, buoyancy driven, bubble plume

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