中文摘要：

实验研究了相变微胶囊颗粒（囊芯材料为正十六烷,壳材为尿素-甲醛树脂）和去离子水混合制成的潜热型功能热流体流过等热流细小圆管的流动与传热特性,同时以去离子水作为传热工质在相同条件下进行了对比实验。得到了压降随质量流量的变化规律,实验段出、入口温度以及量纲1出口温度随Reynolds数变化规律,量纲1壁面温度沿轴向的分布规律,平均Nusselt数随Reynolds数的变化关系。结果表明,相变微胶囊颗粒的加入会导致流动压降增大,但随着流量增加,流动压降逐渐与单相液体的接近;出口温度及壁面温度要比相同条件下单相液体的低;含有较小相变微胶囊颗粒浓度的潜热型功能热流体的平均Nusselt数是相同条件下单相液体的2.0～4.0倍。

英文摘要：

The flow and heat transfer characteristics of microencapsulated phase change material （MEPCM） suspension flow in a mini-tube under a uniform heat flux were experimentally investigated.The MEPCM particles consist of hexadecane as the phase change material and a polyoxymethylene urea wall.For comparison,the experiment was also conducted using deionized water as the working fluid under the same condition.The relationships were obtained for pressure drop and mass flow rate,for dimensionless outlet temperature of test section and Reynolds number,for dimensionless wall temperature along axial direction,and for Nusselt number and Reynolds number.The results show that the use of MEPCM particles increases the pressure drop but it approaches that of water with increasing mass flow rate.The outlet and wall temperatures of the test section are smaller than that of water under the same condition.The Nusselt number of slurry with small concentration of MEPCM particles is about 2.0—4.0 times greater than that of water.