The fabrication of a single glass microchannel to study the hydrophobicity effect on two-phase flow boiling of water
The fabrication of a single glass microchannel to study the hydrophobicity effect on two-phase flow boiling of water
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DOI：
10.1088/0960-1317/18/10/105016
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发表时间：
2008-10-01
影响因子：
2.3
通讯作者：
Kim, Moo Hwan
中科院分区：
文献类型：
--
作者：
Choi, Chiwoong;Kim, Moo Hwan
疏水性是微尺度两相热工水力系统中的一个重要参数，因为界面力在该系统中起着重要的作用。以往的研究主要局限于两相流，大多数结果表明表面疏水性是一个影响因素。然而，疏水性对流动沸腾的影响还没有得到研究，特别是在微尺度下。这是由于微通道的制造和表面改性的耦合困难。本研究发展单一玻璃微通道的制造方法及疏水表面的形成。以去离子水为工质，进行了微通道内的流动沸腾实验。利用高速摄像机和远距离显微镜对两相流流型进行了可视化。由于微通道材料的高透明度，获得了非常清晰的图像。局部干补丁中观察到的细长气泡的液体膜和一个新的流动模式被发现与疏水表面。
Hydrophobicity is an important parameter in a microscale two-phase thermal hydraulic system because the interfacial force has an influential role in this system. Previous research has been limited to the two-phase flow regime, with most results indicating that the surface hydrophobicity is an influential parameter. However, the hydrophobicity effect on flow boiling has not been studied, especially at the microscale. This is due to the coupled difficulties of the fabrication of the microchannel and the modification of its surface. This study develops the methods for the fabrication of a single glass microchannel and the formation of a hydrophobic surface. The flow boiling experiment in the microchannel is conducted using deionized water. The visualization of two-phase flow patterns was carried out using a high-speed camera and a long-distance microscope. Very clear images were obtained due to the high transparency of the microchannel material. Local dry patches were observed in the liquid film of elongated bubbles and a new flow pattern was found with the hydrophobic surface.