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首页> 外文期刊>International Journal of Heat and Mass Transfer >Surface wettability control by nanocoating: The effects on pool boiling heat transfer and nucleation mechanism
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Surface wettability control by nanocoating: The effects on pool boiling heat transfer and nucleation mechanism

机译：纳米涂层控制表面润湿性：对池沸腾传热和成核机理的影响

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摘要

Experiments were performed to highlight the influence of surface wettability on nucleate boiling heat transfer. Nanocoating techniques were used to vary the water contact angle from 20° to 110° by modifying nanoscale surface topography and chemistry. The bubble growth was recorded by a high speed video camera to enable a better understanding of the surface wettability effects on nucleation mechanism. For hydrophilic (wetted) surfaces, it was found that a greater surface wettability increases the vapour bubble departure radius and reduces the bubble emission frequency. Moreover, lower superheat is required for the initial growth of bubbles on hydrophobic (unwetted) surfaces. However, the bubble in contact with the hydrophobic surface cannot detach from the wall and have a curvature radius increasing with time. At higher heat flux, the bubble spreads over the surface and coalesces with bubbles formed at other sites, causing a large area of the surface to become vapour blanketed. The best heat transfer coefficient is obtained with the surface which had a water contact angle close to either 0° or 90°. A new approach of nucleation mechanism is established to clarify the nexus between the surface wettability and the nucleate boiling heat transfer.
机译：进行实验以突出表面润湿性对成核沸腾传热的影响。纳米涂层技术用于通过改变纳米级表面形貌和化学性质将水接触角从20°改变为110°。用高速摄像机记录气泡的生长，以便更好地了解表面润湿性对成核机理的影响。对于亲水的（润湿的）表面，发现更大的表面润湿性增加了蒸汽气泡的离开半径并降低了气泡的发射频率。此外，在疏水性（未润湿）表面上气泡的初始生长需要较低的过热度。但是，与疏水表面接触的气泡不能从壁上脱离，并且曲率半径随着时间增加。在较高的热通量下，气泡会散布在整个表面上，并与在其他位置形成的气泡合并，从而导致大面积的表面被蒸气覆盖。在水接触角接近0°或90°的表面上可获得最佳传热系数。建立了一种新的成核机理方法，以阐明表面润湿性与成核沸腾传热之间的联系。

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