Na2SO4·10H2O相变浆体的改性优化与热性能评估OA

To address the flow blockage and segregation of sodium sulfate decahydrate based phase change material slurries,this study investigated the influence of different additives on their fluidity and stability through crystal morphology observation,static adsorption concentration measurement,and static sedimentation experiments.Comparative experiments identified the optimal amounts of surfactants and stabilizers,leading to the formulation of a modified Na2SO4·10H2O phase change material slurry containing 30%base salt,4%sodium tetraborate decahydrate,0.2%cetyltrimethylammonium chloride,and 0.1%polyacrylamide.Its thermodynamic properties,as well as flow and heat transfer characteristics,were then measured using T-history method and a hydraulic and heat transfer test rig.It was found that the Na2SO4·10H2O phase change material slurry exhibited an effective thermal energy storage density of 131.45 J/g over the temperature range of 27-32℃,which is 6.3 times that of water over the same temperature range.Furthermore,to support the application of the Na2SO4·10H2O phase change material slurry in engineering piping systems based on its flow and heat transfer characteristics,hydraulic and heat transfer correlations for the friction factor and average Nusselt number were developed,achieving high coefficients of determination(R² from 0.91 to 0.98)for laminar and turbulent flow regimes.The above findings are beneficial for the optimal development and practical deployment of salt hydrate phase change material slurries.