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首页> 外文期刊>Heat Transfer Engineering >Flow Boiling in an Inclined Channel With Downward-Facing Heated Upper Wall
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Flow Boiling in an Inclined Channel With Downward-Facing Heated Upper Wall

机译：带有向下加热的上壁的倾斜通道中的流动沸腾

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摘要

Wall boiling and bubble population balance equations combined with a two-fluid model are employed to predict boiling two-phase flow in an inclined channel with a downward-facing heated upper wall. In order to observe the boiling behavior on the inclined, downward-facing heated wall, a visualization experiment was carried out with a 100 mm × 100 mm of the cross section, 1.2-m-long rectangular channel, inclined by 10° from the horizontal plane. The size of the heated wall was 50 mm by 750 mm and the heat flux was provided by Joule heating using DC electrical current. The temperatures of the heater surface were measured and used in calculating heat transfer coefficients. The wall superheat for 100 kW/m~2 heat flux and 200 kg/m~2s mass flux ranged between 9.3℃ and 15.1℃. High-speed video images showed that bubbles were sliding, continuing to grow, and combining with small bubbles growing at their nucleation sites in the downstream. Then large bubbles coalesced together when the bubbles grew too large to have a space between them. Finally, an elongated slug bubble formed and it continued to slide along the heated wall. For these circumstances of wall boiling and two-phase flow in the inclined channel, the existing wall boiling model encompassing bubble growth and sliding was improved by considering the influence of large bubbles near the heated wall and liquid film evaporation under the large slug bubbles. With this improved model, the predicted wall superheat agreed well with the experimental data, while the RPI model largely overpredicted the wall superheat.
机译：结合两个流体模型的壁沸腾和气泡总体平衡方程被用来预测在具有向下加热的上壁的倾斜通道中的沸腾两相流。为了观察在向下倾斜的加热壁上的沸腾行为，进行了可视化实验，该实验的横截面为100 mm×100 mm，长1.2米的矩形通道，与水平方向倾斜10°。飞机。被加热的壁的尺寸为50mm×750mm，并且通过使用直流电流的焦耳加热来提供热通量。测量加热器表面的温度并将其用于计算传热系数。 100 kW / m〜2热通量和200 kg / m〜2s质量通量的壁过热度在9.3℃至15.1℃之间。高速视频图像显示，气泡正在滑动，持续增长，并与下游成核位置的小气泡结合在一起。然后，当气泡太大而无法在它们之间留出空间时，大气泡会聚在一起。最终，形成了一个长条状气泡，气泡继续沿着加热的壁滑动。对于壁沸腾和倾斜通道中两相流动的这些情况，考虑到加热壁附近的大气泡和大块气泡下的液膜蒸发的影响，改进了现有的包含气泡生长和滑动的壁沸腾模型。使用这种改进的模型，预测的壁过热与实验数据吻合得很好，而RPI模型在很大程度上过度预测了壁过热。

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  • 来源
    《Heat Transfer Engineering》 |2014年第8期|492-500|共9页
  • 作者

    HYOUNG-TAK KIM; HAE-KYUN PARK; YOU-TAEK KIM; KWANG-HYUN BANG; JUNGSOO SUH;

  • 作者单位

    Department of Mechanical and Energy Systems Engineering, Korea Maritime University, Busan, Korea;

    Department of Mechanical and Energy Systems Engineering, Korea Maritime University, Busan, Korea;

    Department of Marine System Engineering, Korea Maritime University, Busan, Korea;

    Department of Mechanical and Energy Systems Engineering, Korea Maritime University, 1 Dongsam-dong, Yeongdo-gu, Busan 606-791, Korea;

    Central Research Institute, Korea Hydro and Nuclear Power Co., Daejeon, Korea;

  • 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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