论文部分内容阅读
纳米流体作为新型传热介质可以提高传热系数,而其分散性和稳定性是影响热传递的主要因素,文章讨论了影响纳米氧化铜分散性的主要因素。通过Zeta电位和粒径的测定,讨论了pH值和三种不同的分散剂(SDBS、CATB、阿拉伯胶)对氧化铜纳米流体分散性的影响。发现pH值在8左右时,SDBS、阿拉伯胶做为分散剂时纳米Al2O3悬浮液的Zeta电位绝对值较大,粒径较小;在pH值在2～3之间时,CATB做为分散剂时Al2O3纳米悬浮液的Zeta电位绝对值较大,粒径较小。其中在各个分散剂最佳pH值范围内,SDBS作为分散剂时,纳米氧化铝悬浮液的Zeta电位绝对值最大,粒径最小。
As a new type of heat transfer medium, nanofluids can improve the heat transfer coefficient, and its dispersion and stability are the main factors affecting the heat transfer. The main factors that affect the dispersibility of nano-copper oxide are discussed. The effects of pH value and three different dispersants (SDBS, CATB, gum arabic) on the dispersibility of CuO nanofluids were discussed by Zeta potential and particle size determination. It was found that when the pH value is about 8, the Zeta potential of the nano-Al2O3 suspension is larger and the particle size is smaller when SDBS and gum arabic are used as the dispersant. When the pH is between 2 and 3, CATB is used as the dispersant When the Al2O3 nano-suspension Zeta potential absolute value larger, smaller particle size. Among them, when SDBS was used as the dispersant in the optimum pH range of each dispersant, the Zeta potential of the nano-alumina suspension had the largest absolute value and the smallest particle size.