With recent advances in micro- and nanofabrication, superhydrophilic and superhydrophobic surfaces have been developed. The statics and dynamics of fluids on these surfaces have been well characterized. However, few investigations have been made into the potential of these surfaces to control and enhance other transport phenomena. In this article, we characterize pool boiling on surfaces with wettabilities varied from superhydrophobic to superhydrophilic, and provide nucleation measurements. The most interesting result of our measurements is that the largest heat transfer coefficients are reached not on surfaces with spatially uniform wettability, but on biphilic surfaces, which juxtapose hydrophilic and hydrophobic regions. We develop an analytical model that describes how biphilic surfaces effectively manage the vapor and liquid transport, delaying critical heat flux and maximizing the heat transfer coefficient. Finally, we manufacture and test the first superbiphilic surfaces (juxtaposing superhydrophobic and superhydrophilic regions), which show exceptional performance in pool boiling, combining high critical heat fluxes over 100 W/cm2 with very high heat transfer coefficients, over 100 kW/m2K.
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机译：随着微加工和纳米加工的最新进展，已经开发了超亲水和超疏水表面。这些表面上的流体的静力学和动力学已经得到很好的表征。但是，很少有人研究这些表面控制和增强其他运输现象的潜力。在本文中，我们对润湿性从超疏水性到超亲水性变化的表面上的池沸腾进行了表征，并提供了成核测量值。我们的测量结果最有趣的结果是，最大的传热系数不是在具有空间均匀润湿性的表面上达到的，而是在将亲水性区域和疏水性区域并列的双亲表面上达到的。我们开发了一个分析模型，该模型描述了双亲表面如何有效地管理蒸气和液体的传输，延迟了临界热通量并最大化了传热系数。最后，我们制造并测试了第一个超双亲表面（并置超疏水和超亲水区域），它们在水池沸腾中表现出卓越的性能，结合了超过100 W / cm2的高临界热通量和超过100 kW / m2K的极高的热传递系数。
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