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Local Heat Flux Investigation During Pool Boiling Single Bubble Cycles Under Reduced Gravity

机译：重力作用下池沸腾单个气泡循环过程中的局部热通量研究

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In the present work the bubble diameter, heater surface temperature distribution, and local heat flux during different stages of single bubble cycles during pool boiling of PF-5060 at a pressure of p = 600 mbar have been investigated in several stable low g levels during the 1st Joint European Partial-g Parabolic Flight (JEPPF) Campaign. In previous parabolic flight campaigns, microgravity conditions were achieved by following a parabolic trajectory with the specially equipped A-300-Zero-G Aircraft. In this recent JEPPF campaign, the parabolic trajectories were slightly shifted, to establish-apart from microgravity conditions-also stable gravity levels of 0.16 g (lunar gravity) and 038 g (Martian gravity). High-resolution measurements of the heater surface temperature were performed using high-speed infrared thermography. An infrared (IR)-transparent sputtered heater design was employed in order to allow temperature measurements by IR thermography at a distance of approximately 800 nm to the heater/fluid interface. From the acquired temperature data, the local heat flux distribution was calculated numerically. Bubble shape and interaction were recorded with a high-speed black-and-white camera. In contrast to previous investigations, the stable low gravity levels enabled performance of measurements during single bubble (ebullition) cycles without the influence of residual flows induced by boiling under a different gravity level, as is the case in the beginning of a regular microgravity parabola. The accuracy of the measurement technique could be drastically enhanced compared to earlier publications. A local temperature drop and corresponding heat flux peak have been observed close to the three-phase contact line.
机译：在本工作中，已经研究了在PF-5060在p = 600 mbar的压力下沸腾沸腾期间，在单个气泡循环的不同阶段中，气泡直径，加热器表面温度分布和局部热通量在几个稳定的低g水平下的研究。第一次联合欧洲部分g抛物线飞行（JEPPF）运动。在以前的抛物线飞行运动中，通过配备特殊装备的A-300-Zero-G飞机遵循抛物线轨迹来实现微重力条件。在最近的JEPPF运动中，抛物线轨迹发生了轻微变化，除了微重力条件外，还建立了0.16 g（月球重力）和038 g（火星人重力）的稳定重力水平。使用高速红外热像仪对加热器表面温度进行高分辨率测量。为了允许通过IR热成像法在距加热器/流体界面约800 nm的距离处进行温度测量，采用了红外（IR）透明溅射加热器设计。从获取的温度数据，数值计算局部热通量分布。气泡形状和相互作用用高速黑白相机记录。与以前的研究相比，稳定的低重力水平使得能够在单个气泡（沸腾）循环中进行测量，而没有像常规微重力抛物线开始时那样在不同重力水平下沸腾引起的残留流量的影响。与早期的出版物相比，可以大大提高测量技术的准确性。在三相接触线附近观察到局部温度下降和相应的热通量峰值。

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  • 来源
    《Heat Transfer Engineering》 |2014年第8期|482-491|共10页
  • 作者

    S. FISCHER; S. HERBERT; E. M. SLOMSKI; P. STEPHAN; M. OECHSNER;

  • 作者单位

    Institut fuer Technische Thermodynamik, Petersenstr. 17, 64287, Darmstadt, Germany;

    Institute for Technical Thermodynamics, Technische Universitaet Darmstadt, Darmstadt, Germany;

    State Material Testing Institute Darmstadt, Institute for Material Technology, Surface Technology and Corrosion, Technische Universitaet Darmstadt, Darmstadt, Germany;

    Institute for Technical Thermodynamics, Technische Universitaet Darmstadt, Darmstadt, Germany,Center of Smart Interfaces, Technische Universitaet Darmstadt, Darmstadt, Germany;

    State Material Testing Institute Darmstadt, Institute for Material Technology, Surface Technology and Corrosion, Technische Universitaet Darmstadt, Darmstadt, 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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