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首页> 外文期刊>International Journal of Heat Exchangers >Experimental Investigation of Condensation Flow in a Minichannel by Means of Local Void Fraction Determination
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Experimental Investigation of Condensation Flow in a Minichannel by Means of Local Void Fraction Determination

机译：局部空隙率确定法研究微通道内冷凝水流的实验研究

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摘要

Convective condensation of n-pentane working fluid inside a round 0.56 mm borosilicate tube is presented for a range of mass flow rates from 3.4 to 13.8 kg/(m~2s) corresponding to a range of liquid Reynolds numbers from 21.6 to 39.3. The transparency of the condenser allows the visualization of the condensation flow structures. Three flow regimes are observed according to the flow rate, corresponding to annular or annular-wavy, annular-bubbly and annular intermittent-bubbly flow. A procedure is presented for the experimental determination of the void fraction profile. The variation of the condensation length versus mass flow rate is also reported. In the last part, the average condensation pressure drop is investigated.
机译：提出了在0.56 mm硼硅圆管内的正戊烷工作流体的对流冷凝，其质量流量范围为3.4至13.8 kg /（m〜2s），对应的液体雷诺数范围为21.6至39.3。冷凝器的透明性使冷凝水流动结构可视化。根据流速观察到三种流态，分别对应于环形或环形波浪形，环形气泡和环形间歇气泡流。提供了用于实验确定空隙率分布的程序。还报告了冷凝长度对质量流量的变化。最后，研究了平均冷凝压力降。

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