This research pertains to pool boiling heat transfer characteristics of Aluminum 6061 alloy surfaces that were textured using sink electrical discharge machining (EDM). Prior related work elsewhere utilized EDM as an essential means to roughen a surface or fabricate geometric features such as microchannels and micropillars to investigate boiling. As opposed to this, the present work systematically examined the effect of EDM process parameters viz., the discharge current and the discharge duration to enhance/benchmark boiling performance in the natural convection and nucleate boiling regimes, and comprehend underlying mechanisms. A process-related factor that limits boiling was found to be the growth of a superficial layer on the machined surface, the formation of which is facilitated by the hydrocarbon dielectric fluid used in EDM. This notwithstanding, the highest heat transfer coefficient obtained in this work was roughly five times as that of a reference polished surface. The Data Dependent Systems methodology was adopted to mathematically extract characteristic crater geometry from EDM-textured surface profiles, which highlighted the significance of parameters that are physically relevant such as the crater diameter and the crater volume in correlating boiling performance.

这项研究涉及铝6061合金表面的池沸腾传热特性，该表面使用水槽放电加工（EDM）进行了纹理化处理。其他地方先前的相关工作是利用电火花加工作为使表面变粗糙或制造几何特征（如微通道和微柱）以研究沸腾的基本手段。与此相反，本工作系统地检查了电火花加工工艺参数的影响，即在自然对流和成核沸腾条件下的放电电流和放电持续时间，以增强/基准沸腾性能，并了解其基本机理。发现与工艺相关的限制沸腾的因素是机加工表面上表层的生长，其形成是由EDM中使用的烃介电液促进的。尽管如此，在这项工作中获得的最高传热系数大约是参考抛光表面的五倍。采用了数据依赖系统方法从数学上从EDM纹理化的表面轮廓中提取特征性的陨石坑几何形状，这凸显了与沸腾性能相关的与物理相关的参数（例如陨石坑直径和陨石坑体积）的重要性。