分散剂对CuO纳米流体导热系数的影响研究_贾涛.pdfVIP

第十二届全国电冰箱（柜）、空调器及压缩机学术交流大会论文集第十二届全国电冰箱（柜）、空调器及压缩机学术交流大会论文集 分散剂对CuO纳米流体导热系数的影响研究 贾涛 王瑞祥 （北京建筑大学，北京市建筑能源综合高效利用工程研究中心 北京 100044） 摘要：为了研究分散剂对纳米流体导热系数的影响，本文制备了多组CuO纳米流体，采用重力沉降法和紫外-可见 分光光度法评价其分散稳定性，并用瞬态热线法测量其导热系数。结果表明，在10~50℃范围内，分散剂为SDBS 对应的纳米流体的导热系数比分散剂为SDS、HTAB、GA和无分散剂时的纳米流体分别最大提高了0.13%、 0.21%、0.22%、0.11%。在分散剂浓度0~2.0 g·L-1内，纳米流体导热系数提高率随着分散剂的浓度先增大后 减小。在纳米粉体浓度1.0~5.0 g·L-1内，纳米流体导热系数提高率与纳米粉体质量浓度基本呈线性关系。在 10~50℃温度范围内，纳米流体导热系数提高率与温度呈上凹关系。在10℃、30℃和50℃时，陈化2个月后的纳米流 体的导热系数比新制备的纳米流体分别最大降低了0.20%、0.19%和0.48%。 关键词： 纳米流体；导热系数；分散剂；温度；陈化时间 The Effect of Dispersant on the Thermal Conductivity of CuO Nanofluids JIA Tao WANG Ruixiang ( Beijing Municipality Key Laboratory of HVACR, Beijing University of Civil Engineering and Architecture Beijing 100044) Abstract：In order to research the effect of dispersant on the thermal conductivity of CuO nanofluids, a series of CuO nanofluids were prepared. The gravity sedimentation method and ultraviolet-visible spectrophotometry were used to observe the dispersion stability of nanofluids. The thermal conductivity of nanofluids were measured by transient hot-wire method. These results indicated that the thermal conductivity of nanofluids which dispersant is SDBS is maximum increased by 0.13%, 0.21%, 0.22% and 0.11% than the nanofluids which the dispersant is SDS、HTAB、GA, respectively. The thermal conductivity -1 of nanofluids is increased and then decreased with the increase of concentration of dispersant in 0~2.0 g·L . The thermal conductivity of nanofluids has a linear relationship with the concentration of nanoparticles -1 in 1.0~5.0 g·L . The ther