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In this paper,the mechanism of operation of an inverse circulating thermosyphon evaporator isproposed.The performance characteristics of this novel evaporator have been studied experimentally andtheoretically,The inverse circulating thermosyphon evaporators have higher heat transfer coefficient and longeroperation period in comparison with ordinary circulating ordinary circulating evaporators. 相似文献
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Additives which can significantly enhance the nucleate pool boiling of acetone and Freons have beenfound in experiments.The boiling heat transfer coefficients of the working fluids can increase by 3 to 5 timeswith trace amount additives.The mechanism of enhancing the boiling of the organic fluids with additives hasbeen investigated. 相似文献
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螺旋线圈强化管内单相流体传热的研究 总被引:5,自引:0,他引:5
研究了内插螺旋线圈的水平圆管内水的对流强化传热及流阻特性,探索了螺旋丝径不变,螺距变化对传热及流体阻力的影响;螺距不变,螺旋丝径变化对传热及流体阻力的影响.实验采用25mm×2mm的紫铜圆管,实验段长1.68m,管内走水,Re数的范围在3000~25000之间.通过对实验数据的多元线性回归,得到了传热与流体阻力的实验关联式,采用(Nus/Nu)3.5/(fs/f)作为评估传热与流阻性能的综合判据,实验结果表明在实验范围内,(Nus/Nu)3.5/(fs/f)的值在1.2~10.7之间,大于1,说明插入螺旋线圈有效地强化了管内传热. 相似文献
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竖直管内不互溶物系蒸汽冷凝液泛汽速的研究 总被引:1,自引:0,他引:1
进行了不互溶物系蒸汽在竖直管内降膜冷凝的实验研究,测得了蒸汽冷凝的上升极限汔速。建立了不互溶物系蒸汽冷凝上升极限汽速的数学模型。本文模型计算和Wallis关系式计算值以及本文的实验结果的比较表明,本文模型具有很好的预测能力。 相似文献
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