Development of a new high performance heat exchanger using a surfactant water solution

使用表面活性剂水溶液开发新型高性能热交换器

• 批准号: 12650199
• 负责人: KUMADA Masaya
• 金额: $ 2.3万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650199/
• 关键词: Tom's effect; Drag redaction; Heat transfer enhancement; Turbulence promoter; Performance evaluation based on a constant pump power; Surfactant solution; Heat exchanger; 三角リブ

An experiment was conducted to investigate the drag-reduction and the heat transfer characteristics in a surfactant water solution flow. It was confirmed that the percentage of the drag-reduction was more than 70 % and simultaneously, the heat transfer coefficient was reduced at the same rate. In order to promote the heat transfer for the surfactant water solution flow, an enhancement method using a triangular rib was proposed. Comparing with the case without rib, it was found that the dependence of the drag-reduction and the heat transfer characteristics on Re and C was similar, but the critical Reynolds number at which the drag reduction reaches a maximum was smaller. Further, by the performance evaluation based on a constant pump power, it was verified that the compound method by the surfactant and the triangular rib is effective to improve the performance of heat exchangers.To investigate the temperature dependence of the Tom's effect, measurements of velocity and temperature profi … More les in a two-dimensional channel were done as parameters of inlet velocity, temperature of the working fluid and wall surface. It was found that the velocity profiles vary clearly with temperature of the wall surface as comparing with the temperature profiles. However, the Tom's effect does not stop working, when the temperature in the thermal boundary layer is that it stops working. The Tom's effect is very sensitive for the temperature, on the other hand it is suggested that the varying process is complex.The rate of drag reduction of a single pipe with, roughness surface using the air-conditioner was measured, because the triangle rib as mentioned above is too expensive to apply to a real-product heat exchanger. It was found that the appearance of the Toms effect is observed as similar with previous results. As concerning the heat exchanger, the rate of drag reduction of the radiator on the market with using roughness pipe is measured. It is decreased by the header part of the radiator, however the roughness pipe is still useful for the drag reduction. Less

进行了一个实验，以研究生存水溶液流中的拖曳还原和传热特性。有人证实，还原拖拉的百分比超过70％，简而言之，以相同的速度降低了传热系数。为了促进表面活性剂水溶液流的热传递，提出了一种使用三角肋的增强方法。与没有肋骨的情况相比，发现拖曳还原和热传递特性的依赖性相似，但是降低阻力到达最大值的临界雷诺数较小。 Further, by the performance evaluation based on a constant pump power, it was verified that the compound method by the surfactant and the triangular rib is effective to improve the performance of heat exchangers.To investigate the temperature dependence of the Tom's effect, measurements of velocity and temperature profi … More les in a two-dimensional channel were done as parameters of inlet velocity, temperature of the working fluid and wall surface.发现与温度曲线相比，速度曲线随壁表面温度的变化而变化。但是，当热边界层中的温度停止工作时，汤姆的效果不会停止工作。汤姆的效果对温度非常敏感，另一方面建议变化的过程是复杂的。测量了带有空调的粗糙度表面的单根管的拖放速率，因为如上所述的三角形肋骨太昂贵了，无法应用于实际产品热交换器。发现观察到TOMS效应的外观与先前的结果相似。与热交换器有关，测量了使用粗糙度管的散热器在市场上的阻力减小速率。它被散热器的标头部分降低，但是粗糙度管仍然可用于减速。较少的