CHEN Fenglan¹, TIE Shengnian¹, WANG Changan^1,2

(1.New Energy Photovoltaic Industry Research Center, Qinghai University, Xining 810016, China;2.School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)

Abstract: On the basis of Na₂SO₄·10H₂O-Na₂CO₃·10H₂O-NaCl ternary phase change system, graphene oxide(GO)mirabilite phase change nanofluids(GSPCNs)was prepared by two-step method.The results show that nano graphene oxide has good dispersion stability when ultrasonically dispersed in the mirabilite phase change materials at the temperature above 35 ℃.At 35～50 ℃, the viscosity of GO-GSPCNs is constant over time and has no thixotropy.At 35 ℃, when the shear rate is more than 30 s^-1, GO-GSPCNs is the Newtonian fluid, its shear rate is less than 30 s^-1, showing non-Newtonian shear thinning behavior obeying the Bingham fluid model, and disposable index is higher than 0.999.When the shear stress is 100 Pa, the viscosity of GO-GSPCNs decreases with increasing of temperature.After 1 200 solid-liquid cycles of GO-GSPCNs with different volume fraction, the rheological behavior changes at low shear rate.The viscosity of GO-GSPCNs decrease after circulation and the flow resistance of GO-GSPCNs decreases.

Keywords: nano graphene oxide; mirabilite phase change nanofluid; rheological property; solid-liquid circulation

中图分类号： TB34; O373                          文献标志码：A

文章编号：1008-5548(2022)03-0077-09

DOI:10.13732/j.issn.1008-5548.2022.03.010

收稿日期： 2021-12-07， 修回日期：2022-03-11，在线出版时间：2022-04-27。

基金项目：青海省自然科学基金项目,编号：2020-ZJ-909、2021-ZJ-906；材料复合新技术国家重点实验室(武汉理工大学)开放基金项目,编号：2020-KF-1。

第一作者简介：陈凤兰(1997—)，女，硕士研究生，研究方向为相变储能材料。E-mail：qhucfl202097@163.com。

通信作者简介：铁生年(1965—)，男，教授，博士生导师，研究方向为新材料高值化。E-mail：tieshengnian@163.com。