There are numerous technical applications where hot components, with uneven temperature distribution, require cooling. In such applications, it is desired to provide efficient local cooling of the hot spots, while avoiding unnecessary over-cooling of the other regions. Such an approach, known as precision cooling, has several advantages. In addition to the fact that it reduces the effort for cooling, it limits the unintended heat lost to the cooling medium. In liquid cooled systems, such as Internal Combustion Engines (ICE), subcooled flow boiling offers immense potential for precision cooling. The primary challenges in extracting this potential are understanding the complexities in the subcooled flow boiling phenomenon and estimating the risk of encountering film boiling. The present study introduces a numerical model to estimate the wall heat flux in subcooled flow boiling and the model includes a mechanistic formulation to account for vapor bubble interaction. The formulation for vapor bubble interaction serves two purposes: (a) blends two well-established models in the literature, one in the isolated bubbles regime and other in the fully developed boiling regime, to estimate the wall heat flux; and (b) provides information to limit boiling in order to not encounter film boiling. The results from the new model are validated with two different experiments in the literature and the wall heat flux estimated by the model is in agreement with experimental results and responsive to different input parameters, such as bulk velocity, operating pressure and inlet subcooling. The new model requires only input of local flow quantities and hence implementation in Computational Fluid Dynamics (CFD) is straightforward.

在许多技术应用中，温度分布不均的热组件需要冷却。在这样的应用中，期望提供热点的有效局部冷却，同时避免其他区域的不必要的过度冷却。这种称为精密冷却的方法具有多个优点。除了减少了冷却工作量的事实外，它还限制了流向冷却介质的意外热量。在诸如内燃机（ICE）之类的液体冷却系统中，过冷沸腾提供了精确冷却的巨大潜力。挖掘这种潜力的主要挑战是了解过冷流沸腾现象的复杂性，并估计遇到膜沸腾的风险。本研究引入了一个数值模型来估计过冷流沸腾过程中的壁热通量，该模型包括一个机械公式来说明蒸气气泡的相互作用。蒸气气泡相互作用的公式具有两个目的：（a）混合文献中的两个公认的模型，一个用于孤立气泡状态，另一个用于完全发展的沸腾状态，以估计壁的热通量；（b）提供限制沸腾的信息，以免发生薄膜沸腾。新模型的结果已通过文献中的两个不同实验进行了验证，该模型估算的壁热通量与实验结果一致，并且对不同的输入参数（例如整体速度，工作压力和入口过冷）做出了响应。