制备了分别具有亲水和疏水特性的2种纳米特性表面,对具有不同固液接触角的传热面上圆柱型高速水喷流沸腾的沸腾临界热流密度(CHF)进行了系统的稳态实验研究,重点考察了喷流速度,过冷度和传热面固液接触角对CHF的影响.通过研究整理了传热面固液接触角和CHF之间的实验关系.对作者过去提出的饱和液与过冷液圆柱喷流沸腾CHF的半理论关系式进行了扩展和改进,使公式扩展到高流速范围和广泛的固液接触角范围.改进的关系式与实验数据符合得很好.
This experimental study investigates the critical heat flux (CHF) of high-velocity circular jet impingement boiling on the nano-characteristic surface of the stagnation zone with different surface wettability.The wettability of the copper surface is varied to hydrophilic or hydrophobic nano-characteristic surfaces by modifying surface topography and chemistry.The effect of impact velocity,subcooling and solid-liquid contact angle (CA) on the CHF are studied thoroughly.The experimental relationship between CA and CHF of the heat transfer surface is summarized by further discussion.The semi-theoretical correlations proposed by the author previously for predicting the CHF of saturated and subcooled circular jet impingement boiling on the stagnation zone are improved and expanded to higher impact velocity and wider CA range.The comparison results indicate the predicted value of the improved correlations agrees well with the experimental data.
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