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首页> 外文期刊>International Journal of Mechanical Engineering Education >A boiling heat transfer experiment for a senior-level engineering laboratory
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A boiling heat transfer experiment for a senior-level engineering laboratory

机译：高级工程实验室的沸腾传热实验

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摘要

This paper presents a simple experiment that can be executed in an undergraduate laboratory to observe the boiling curve, including the transition and film boiling regimes. The experiment involves submerging an instrumented copper sphere into liquid nitrogen and measuring the evolution of the temperature of the sphere. Besides providing excellent visualization of the film, transition and nucleate boiling regimes, from the measurements the boiling curve can be obtained. Quantitative results and uncertainty analysis are presented for the critical heat flux and minimum heat flux. A paradox is presented when insulation is added to the sphere, since it can prevent the creation of a vapor film, maintaining the more efficient transition and nucleate boiling heat transfer regime and thus cooling the copper sphere faster than with no insulation. As expected, when the copper sphere is insulated further, heat transfer diminishes, offsetting the gains made by maintaining nucleate heat transfer. The experiment also evaluates temperature gradients inside the sphere and the validity of the assumption of uniform sphere temperature. This experiment is suitable for a senior-level experimental class or as a part of a heat transfer course.
机译：本文提出了一个简单的实验，该实验可以在大学实验室中进行以观察沸腾曲线，包括过渡和薄膜沸腾状态。该实验包括将仪器铜球浸入液氮中并测量球温度的变化。除了可以很好地观察薄膜，过渡和成核沸腾状态外，还可以通过测量获得沸腾曲线。给出了临界热通量和最小热通量的定量结果和不确定性分析。在将绝缘材料添加到球体时会出现一个悖论，因为它可以防止蒸气膜的产生，保持更有效的过渡和成核的沸腾传热机制，从而比没有绝缘体时更快地冷却铜球体。不出所料，当铜球进一步绝缘时，热传递会减少，从而抵消了维持核形热传递所获得的收益。实验还评估了球体内部的温度梯度以及假设球体温度均匀的有效性。该实验适合于高级实验班或作为传热课程的一部分。

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