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首页> 外文期刊>International Journal of Heat and Mass Transfer >Capillary and wetting properties of copper metal foams in the presence of evaporation and sintered walls
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Capillary and wetting properties of copper metal foams in the presence of evaporation and sintered walls

机译：存在蒸发和烧结壁的情况下铜金属泡沫的毛细管和润湿性能

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An experimental study has been done to define the capillary and wetting characteristics of a novel type of copper metal foam which is to be used as a wick in flat heat pipes for electronic cooling. Unlike other metal foams, a microstructure including micro scale particles and larger capillary paths can be observed in this type of copper metal foam. Due to the significant importance of the capillary properties such as permeability (K) and effective pore radius (r_(eff)) in defining the capillary limit of heat pipes, the rate of rise method based on the measured mass was used to extract these parameters. Foams of different porosities (68-85%) were fully characterized with multiple fluids (water, acetone, and ethanol). The ratio K/r_(eff) was found to be almost 5 times larger than that reported for sintered copper powder, a common wicking material in heat pipes. The impact of evaporation and walls sintered on one side or on both sides of foam strips has been studied in open and partially saturated ambient. The evaporation rate during wicking was measured by subtracting the stored mass of liquid in the foam from the total wicked mass. It was found that the rate of evaporation while the liquid is rising is significantly lower than the evaporation rate of a saturated sample with stationary liquid. It was also observed that sintering copper walls has almost no effect on the capillary rise and on the evaporation rate. By combining measurements done with acetone and water, the internal contact angle of water in hydrogen treated copper foams was found to be lower than on a flat plate and varies from 10° to 37° depending on the foams porosity. This work therefore provides the first characterization of K, r_(eff), and internal contact angle for these novel metal foams, but also clarifies the conditions under which the rate of rise measurements should be done for proper parameter extraction.
机译：已经进行了一项实验研究，以定义新型铜泡沫金属的毛细管和润湿特性，该泡沫金属将用作扁平式热管中用于电子冷却的芯子。与其他金属泡沫不同，在这种类型的铜金属泡沫中可以观察到包括微米级颗粒和较大毛细管路径的微观结构。由于在定义热管的毛细管极限时，诸如渗透率（K）和有效孔半径（r_（eff））之类的毛细管特性非常重要，因此使用基于测量质量的上升速率方法来提取这些参数。用多种流体（水，丙酮和乙醇）充分表征了不同孔隙度（68-85％）的泡沫。发现比率K / r_（eff）几乎比报道的烧结铜粉大5倍，烧结铜粉是热管中常见的芯吸材料。在开放和部分饱和的环境中，已经研究了蒸发和泡沫板的一侧或两侧烧结的壁的影响。芯吸过程中的蒸发速率是通过从总芯吸质量中减去泡沫中液体的存储质量来测量的。发现在液体上升时的蒸发速率明显低于具有固定液体的饱和样品的蒸发速率。还观察到，烧结铜壁对毛细管上升和蒸发速率几乎没有影响。通过结合使用丙酮和水进行的测量，发现氢处理的铜泡沫中水的内部接触角比平板上的小，并且根据泡沫的孔隙率在10°至37°之间变化。因此，这项工作为这些新型金属泡沫提供了K，r_（eff）和内部接触角的第一个特征，同时也阐明了为适当地提取参数而应进行上升速率测量的条件。

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