Experimental Study On Surface Tension And Viscosity Of Oxygenated Fule

Surface tension is an important physical quantity to describe the phenomena of fluid interface,which influence the fluid interface heat and mass transfer, heat transfer and micro channel flow boiling. Viscosity is an important migration property of fluids, which represents the transport properties of fluid molecules. Surface tension and viscosity are important thermal physical properties of fuel,which influence the selection of working fluids,design of efficient and energy-saving equipment and optimization of the process. Accurate viscosity and surface tension data have important significance for the development of high efficiency energy saving equipment, the design optimization of process flow and the reduction of operating cost.Improved existing pendent drop apparatus,include experimental body and the supporting and regulating device. The improved experimental system to solve the existing in the original system of fogging, liquid leakage, needle tube liquid suction, device regulation is difficult and long time. When adjusting device, the position of the heating barrel can be influenced, and the image of the liquid drop can not be photographed.The improved experimental system with good sealing performance, and convenient adjustment, eliminate window fogging in 10 ~ 15 minutes, experimental efficiency has been effectively increased.For checking the apparatus, the surface tension of heptane was measured in the temperature range from(293.15 to 373.13) K and good agreement can be found from the literarure data. at the same time, the equation was fitted and compared with the literature value. The expand uncertainty of the improved apparatus for liquid surface tension measurement is extimated to be less than 0.44% at a confidence level of 95%(k = 2).On the basis of the new improved experiment system, the surface tension values of dimemethyl carbonate, alkane and mixed solution under different temperature points were measured. Dimemethyl carbonate and alkane the temperature range from 298.15 K to 343.15 K,then,the mixed solution temperature range from 298.15 K to 343.15 K. 298.15 K to 333.15 K and 303.15 K to 318.15 K. These results fill the blank of the experimental data of the surface tension between the oxygenated fuel and the alkane mixture, and provide data support for the research and engineering application of the clean fuel.A dynamic light scattering experiment system was developed,including the experimental device, the scattered light path, the temperature control system and the data acquisition system. According to the different volume fraction of preparing SiC /Heptane,Al2O3/H2 O and SiO2/H2 O nanofluids and the dispersion stability were investigated. The particle size of silica/water nano particles was measured by dynamic light scattering experiment system. The results show that the maximum deviation of the particle size of silica / water nanoparticles with a volume fraction of 0.0025% was 0.513% and the average deviation was 0.351%. The dynamic light scattering experiment system can meet the measurement of liquid viscosity. On this basis, the silica particles dispersed into methyl hexanoate, stable suspensions were obtained, and experiments were carried out on the viscosity.