The Dispersion Of Cu Nanofluids And Study The Emulsification Of Liquid Paraffin

Nanofluids refers to in a certain way and proportion of nanoscale is added in the liquid metal or metal oxide particles,prepared into a uniform,stable and high thermal conductivity of the new type heat transfer medium. Over the years nanofluids has enormous potential in terms of improving the thermal conductivity of the fluid that has caused widespread concern. However, due to the Brownian motion of particles and particle surface adsorption, that make it easy reunion in the base fluid, result in poor dispersion. So, how to prepare stable nanofluids has became the primary problem of heat transfer enhancement of nanofluids preliminary work. Also it is necessary of using in nano-fluid heat transfer process technologies.Starch-based alkyl glycoside(starch glucoside for short) is the non-ionic surfactant. It has two important features in the interface chemistry. The effect of different molecular aggregates formed under different conditions. On different physical and chemical adsorption interface with tropism.This paper adopt the pattern of distilled water extraction and distillation under reduced pressure for recover the by-products of Glycol and C8C10from starch and synthetic glycosides. Investigate the binary system of starch and Tween60glycoside surfactant complex dispersion of liquid paraffin and emulsifying effect principle.In this paper, the experimental research work mainly includes three aspects.(1)The method of two steps about the synthesis of Cu-water nanofluids is researched, the base fluid is water, and synthesis is studied.First, by study a variety of different dispersants,analysis of the dispersion mechanism. By a single factor synthesis determine optimal treatment process. Finally,The TEM represent their dispersion stability and copper nanofluid.(2)Copper nanofluid is Synthesis by the method of liquid phase chemical synthesis. The first of, choose a suitable reducing agent. The evaluation methods are the absorbance,centrifugation speed and the settling time,study the reaction mechanism. Followed by single factor experiments to determine the appropriate process. Finally, TEM and laser light scattering character represent the dispersion effect and particle size. Hot Disk TPS2500measured its coefficient of thermal conductivity.(3)Adopt the pattern of distilled water extraction and distillation under reduced pressure for recover the by-products of Glycol and C8C10. The product is characterized by IR, GC, the starch glycosides utilize recycled alcohol accord to national standards. Adopt the way of mechanical dispersing and the emulsifier of C8C10starch glycosides and Tween60. Investigate the binary system conditions and mechanism of emulsifier liquid paraffin emulsion, and evaluate emulsification effect.The experimental results show that:(1)Sodium citrate for Cu-water nanofluids has the better dispersion than the APG, STPP, PAM, GA dispersant. The optimum synthetic conditions were as follows:the pH value for3-4, the feeding quantity of Cu nanoparticles is1%, the feeding quantity of sodium citrate is1%. The absorbance has a litter change with the increasing the time.(2)Adopt liquid phase chemical synthesis in the ultrasonic bath.use the Sodium citrate as the dispersion and KBH4as the reducing agent. Through single factor experiment, we know the best Optimal Synthesis. The results indicate that under the conditions of temperature40℃, the Sodium citrate of dispersant is about0.7mol/L, under the The molar ratio of is2.5, that reaction time is100min.The Nanofluids can exist62D. The TEM results proved that have good effect and stability.and the Particle size analysis is1.1nm. The last, utilize Hot Disk TPS2500show that Thermal conductivity increases by30%.(3)The emulsifier of C8C10starch glycosides and Tween60, The optimum condition distill water extraction C8C10is that m(distilled water):m(by-products Ⅱ)=1:1,Speed is200r/min; rpm is30min, rest time is48h;C8C10recoveries is74%. The emulsion preparation conditions:High shear speed9000r-min-1; high shear time60min; product dosage is2%; oil is60%; m (APG):m (Tween60)=2.5:1.