Abstract A water droplet stretching vertically in between hydrophobic and hydrophilic plates is considered and droplet heat transfer due to heating from bottom hydrophobic surface is analyzed. The bottom polycarbonate plate surface is hydrophobized through solution immersion technique. The experiments and simulations are repeated for various plates spacings. Findings reveal that the stretching causes necking of the droplet in the top plate region. Droplet heating and stretching cause elongated circulating structures in the vertical direction while increasing velocity in the droplet. The Nusselt number reaches large values prior to droplet stretching and it reduces after stretching. This is related to convection heat transfer from droplet bottom region, which is suppressed by the elongated cell structures under stretching. The Bond number becomes less than one for all plates spacing and the Bond number rises with enhancing droplet volume.

中文翻译：

---

疏水板和亲水板之间的液滴拉伸：液滴流体加热

摘要 考虑在疏水板和亲水板之间垂直伸展的水滴，分析了由于底部疏水表面受热引起的水滴传热。底部聚碳酸酯板表面通过溶液浸渍技术进行疏水化处理。对不同的板间距重复实验和模拟。结果表明，拉伸导致顶板区域中的液滴颈缩。液滴加热和拉伸会导致垂直方向上的细长循环结构，同时增加液滴中的速度。Nusselt 数在液滴拉伸前达到较大值，在拉伸后减小。这与来自液滴底部区域的对流热传递有关，这被拉伸下的细长单元结构所抑制。