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首页> 外文期刊>International Journal of Heat and Mass Transfer >Simulations of saturated boiling heat transfer on bio-inspired two-phase heat sinks by a phase-change lattice Boltzmann method
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Simulations of saturated boiling heat transfer on bio-inspired two-phase heat sinks by a phase-change lattice Boltzmann method

机译：相变格子玻尔兹曼法模拟生物启发式两相散热器的饱和沸腾换热

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摘要

Pool boiling heat transfer from four types of micro-pillar heat sinks with different wettability patterns is simulated numerically with the latest version of liquid-vapor phase-change lattice Boltzmann model. Effects of pillar geometry and wettability on bubble dynamics are investigated. It is found that bubbles will nucleate either on the hydrophobic pillar top or on the hydrophilic cavity bottom between micro-pillars, depending on wettability and local wall temperature. Among the four types of micro-pillar heat sinks with hybrid wettability patterns, it is found that the bio-inspired heat sink (with hydrophobic pillar tops and hydrophilic base) has the best boiling heat transfer performance with the following desirable features: (i) unique characteristics of orderly separation of vapor and liquid paths at low superheats, (ii) hydrophobic surface characteristics where residual bubbles on hydrophobic pillar tops provide faster bubble departure frequency, (iii) triple phase lines are pinned at corners of micro-pillar, restricting expansion of bubbles into film boiling at high superheats. Simulated results show that geometry of micro-pillars and wettability patterns greatly influence transition boiling regime including the maximum heat flux (CHF) and the Leidenfrost temperature, resulting in pool boiling curves with widely different shapes.
机译：使用最新版本的液-汽相变晶格玻尔兹曼模型对来自四种具有不同润湿性模式的微柱状散热器的池沸腾传热进行了数值模拟。研究了支柱几何形状和润湿性对气泡动力学的影响。已发现，气泡将在微柱之间的疏水柱顶部或亲水腔底部成核，具体取决于润湿性和局部壁温。在具有混合润湿性模式的四种类型的微柱散热器中，发现具有生物启发性的散热器（具有疏水柱顶和亲水基体）具有最佳的沸腾传热性能，并具有以下理想特征：（i）在低过热度下蒸气和液体路径有序分离的独特特征；（ii）疏水性表面特征，其中疏水性支柱顶部的残留气泡可提供更快的气泡离开频率；（iii）三相线固定在微柱的拐角处，从而限制了膨胀过热时气泡变成薄膜沸腾。模拟结果表明，微柱的几何形状和润湿性模式会极大地影响过渡沸腾状态，包括最大热通量（CHF）和莱顿弗罗斯特温度，从而导致池沸腾曲线的形状大不相同。

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