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首页> 外文期刊>Heat Transfer Engineering >Confined Boiling Heat Transfer, Two-Phase Flow Patterns, and Jet Impingement in a Hele-Shaw Cell
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Confined Boiling Heat Transfer, Two-Phase Flow Patterns, and Jet Impingement in a Hele-Shaw Cell

机译：受限的沸腾传热，两相流型和射流冲击

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摘要

Experiments were carried out to study heat transfer and two-phase flow patterns during boiling in a Hele-Shaw cell filled with pure water vapor at atmospheric pressure and with a central inlet of a liquid jet. The Hele-Shaw cell was based on a circular copper rod surface and a polycarbonate plate permitting optical access and thus high-speed cinematography. The diameter of the heated copper rod was 10 mm, the jet diameters were 05 and 1 mm, and spacing was varied between 50,100, and 200 µm. The heat was applied through 4 cartridge heaters with a maximum heat flux of 327 W/cm~2. Results showed how high-volume flow rates for the liquid jet led to jet impingement heat transfer while low flow rates led to a Hele-Shaw flow boiling system. The relationship between the volume flow rate and the temperature difference differed significantly between these two regimes. Different flow patterns and evaporation fronts were observed using high-speed cinematography. They strongly depended on jet properties, applied heat flux, and gap spacing. The efficiency of the Hele-Shaw flow boiling system during high heat flux levels was attributed to high interface velocities, combined with viscous fingering at the interface. This combination led to high wetting rates with substantial microlayer evaporation. Good results regarding the heat transfer and the pressure drop were obtained with the final configuration of a 10-mm copper rod diameter, a jet diameter of 1 mm, and a spacing of 0.1 mm. A rather surprising observation was the existence of a stable rotation of an evaporating liquid jet in the Hele-Shaw boiling chamber. The driving mechanism for the rotation with a frequency of 105 Hz was the rapid microlayer evaporation at the rear side of the rotating liquid jet.
机译：进行实验以研究在装有纯水蒸气且在大气压下并具有液体喷射器中央入口的Hele-Shaw池中沸腾期间的传热和两相流模式。 Hele-Shaw盒基于圆形的铜棒表面和聚碳酸酯板，可以进行光学访问，从而可以进行高速摄影。加热的铜棒的直径为10 mm，射流直径为05和1 mm，间距在50,100和200 µm之间变化。通过4个筒式加热器加热，最大热通量为327 W / cm〜2。结果表明，液体射流的大流量如何导致射流撞击传热，而低流量则导致Hele-Shaw流动沸腾系统。在这两种情况下，体积流量和温度差之间的关系存在显着差异。使用高速摄影术观察到了不同的流型和蒸发前沿。它们在很大程度上取决于射流特性，施加的热通量和间隙间距。 Hele-Shaw流动沸腾系统在高热通量水平下的效率归因于较高的界面速度，以及界面处的粘性指法。这种结合导致高的润湿速率和大量的微层蒸发。在最终配置为10mm铜棒直径，1mm射流直径和0.1mm间距的情况下，获得了有关传热和压降的良好结果。一个相当令人惊讶的发现是在Hele-Shaw沸腾室中存在着蒸发液体射流的稳定旋转。旋转频率为105 Hz的驱动机制是旋转液体射流后侧的快速微层蒸发。

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  • 来源
    《Heat Transfer Engineering》 |2017年第4期|290-302|共13页
  • 作者

    Marek Kapitz; Stefan aus der Wiesche;

  • 作者单位

    Department of Mechanical Engineering, Muenster University of Applied Sciences, Steinfurt, Germany;

    Department of Mechanical Engineering, Muenster University of Applied Sciences, Steinfurt, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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