Seo Donghyun, Shim Jaehwan, Lee Choongyeop, Nam Youngsuk
Department of Mechanical Engineering, Kyung Hee University, Yongin, 446-701, South Korea.
Sci Rep. 2020 Feb 19;10(1):2959. doi: 10.1038/s41598-020-59683-z.
Recently, lubricant-impregnated surfaces (LIS) have emerged as a promising condenser surface by facilitating the removal of condensates from the surface. However, LIS has the critical limitation in that lubricant oil is depleted along with the removal of condensates. Such oil depletion is significantly aggravated under high condensation heat transfer. Here we propose a brushed LIS (BLIS) that can allow the application of LIS under high condensation heat transfer indefinitely by overcoming the previous oil depletion limit. In BLIS, a brush replenishes the depleted oil via physical contact with the rotational tube, while oil is continuously supplied to the brush by capillarity. In addition, BLIS helps enhance heat transfer performance with additional route to droplet removal by brush sweeping. By applying BLIS, we maintain the stable dropwise condensation mode for > 48 hours under high supersaturation levels along with up to 61% heat transfer enhancement compared to hydrophobic surfaces.
最近，浸渍润滑剂的表面（LIS）作为一种有前景的冷凝器表面出现，它有助于从表面去除冷凝物。然而，LIS存在关键限制，即润滑油会随着冷凝物的去除而耗尽。在高冷凝传热条件下，这种油的耗尽会显著加剧。在此，我们提出一种刷式LIS（BLIS），通过克服先前的油耗尽限制，能够在高冷凝传热条件下无限期地应用LIS。在BLIS中，刷子通过与旋转管的物理接触补充耗尽的油，而油通过毛细作用不断供应到刷子。此外，BLIS通过刷子清扫提供额外的液滴去除途径，有助于提高传热性能。通过应用BLIS，我们在高过饱和度水平下保持稳定的滴状冷凝模式超过48小时，与疏水表面相比，传热增强高达61%。
