Microlayer evaporation during bubble growth in nucleate boiling

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Heat and Mass Transfer Pub Date : 2024-07-02 DOI:10.1016/j.ijheatmasstransfer.2024.125860

Cassiano Tecchio , Benjamin Cariteau , Corentin Le Houedec , Guillaume Bois , Elie Saikali , Gilbert Zalczer , Simon Vassant , Pere Roca i Cabarrocas , Pavel Bulkin , Jérôme Charliac , Vadim S. Nikolayev

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Abstract

We experimentally investigate the near-wall heat transfer at single bubble growth in nucleate saturated pool boiling of water at atmospheric pressure. Our focus is on the evaporation of the micro-metric thin film of liquid (microlayer) that is formed between the heating wall and the bubble. High speed and high resolution optical techniques are employed. Synchronous and simultaneous measurements of the microlayer thickness, wall temperature and bubble macroscopic shape are performed by white light interferometry, infrared thermography and side-wise shadowgraphy, respectively. We measure the wall temperature of an ITO heating film through a transparent to the infrared waves porthole. The heating is provided by an infrared laser. The wall heat flux is numerically reconstructed by using the experimental wall temperature data. We reveal a temporal rise of the thermal resistance of the liquid–vapor interface during the microlayer evaporation, which corresponds to a decrease of the accommodation coefficient. We attribute it to the progressive accumulation of impurities at the interface during evaporation. The contribution of microlayer evaporation to the overall bubble growth is about 18%.

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核沸腾中气泡生长过程中的微层蒸发

我们通过实验研究了在大气压力下核饱和池水沸腾中单个气泡生长时的近壁传热。我们的研究重点是加热壁和气泡之间形成的微米级液体薄膜（微层）的蒸发。我们采用了高速和高分辨率的光学技术。通过白光干涉测量法、红外热成像法和侧影成像法分别对微层厚度、壁温和气泡宏观形状进行同步和同步测量。我们通过对红外波透明的舷窗测量 ITO 加热膜的壁温。加热由红外激光器提供。通过使用实验壁温数据，对壁热通量进行了数值重建。我们发现，在微层蒸发过程中，液体-蒸汽界面的热阻会随着时间的推移而上升，这与容纳系数的下降相对应。我们将其归因于蒸发过程中界面上杂质的逐渐积累。微层蒸发对整个气泡增长的贡献率约为 18%。

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer