水基磁性流体池沸腾传热强化的实验研究

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Experiments of Pool Boiling Heat Transfer Enhancement of Water-Based Magnetic Fluid

1. Institute of Refrigeration and Cryogenics, Shanghai Jiaotong University, Shanghai 200030, China;
2. Anhui Jinke Magnetic Liquids Co. Ltd, Maanshan, Anhui 243000, China

摘要: 通过水和水基磁性流体池沸腾传热的对比实验,确定了水基磁性流体强化沸腾传热的效果,并进行了机理分析。实验结果显示,热流密度相同时,水基磁性流体的沸腾换热系数比水至少增强2倍,施加磁场可进一步强化沸腾传热,增强倍数可超过5倍。通过分析磁场对磁性流体中沸腾汽泡的影响,认为施加磁场有使汽泡脱离直径减小、生长速度加快和脱离频率增加的作用。
- 磁性流体 /
- 沸腾传热 /
- 强化 /
- 汽泡
Abstract: A contrast experimental study of the pool boiling heat transfer of water and water-based magnetic fluid was conducted to investigate the effect of water-based magnetic fluid on pool boiling heat transfer, and mechanism of heat transfer enhancement was analyzed. The experimental results showed that the boiling heat transfer coefficient of magnetic fluid was enhanced at least 2 times than that of water at the same heat flux; When applied magnetic field, the boiling heat transfer of magnetic fluid can be enhanced further, which is over 5 times than that of water. The analysis of the effect of a magnetic field on bubbles showed that the applied magnetic field caused the departure diameter of bubble to decrease, the bubble growth rate to rise and the frequency of bubble departure to increase.
- Magnetic fluid /
- Pool boiling heat transfer /
- Enhancement /
- Bubble