Papers by Keyword: Surface Tension

Abstract: The water-based graphene oxide nanofluids were prepared. The surface tension of nanofluids with different mass fraction, temperature and different nanoparticle size was researched. The surface tension value was measured through ringmethod. The experimental results show that the surface tension of nanofluids is increased with increasing the mass faction of nanoparticles. But the surface tension of nanofluids with maximum concentration (0.1 wt %) is only increased up to 2.9% compared with deionized water. The surface tension of nanofluids decreases with increasing temperature and decreasing nanoparticle size. The results of this paper may provide reference for the research of absorption liquid for absorption refrigeration cycle.

Abstract: This study selected high alkali aluminosilicate glass as the research object. It’s belongs to the SiO₂-Al₂O₃-RO-R₂O glass system. By changing the content of Al₂O₃ in the SiO₂-Al₂O₃-RO-R₂O glass system, designed five basic glass formula. Using conventional melting method prepared the high alkali aluminosilicate glass. In the case of the same heat treatment, the glass formulations are the most important factor in the glass surface tension. Using the glass surface tension measuring instrument, focus on the content of Al₂O₃ on the glass surface tension’s effects law. The results show that the high alkali aluminosilicate glass’s surface tension are increase with the increase of Al₂O₃ content. The relation between glass surface tension and the content of Al₂O₃ conforms to the formula Y=290+6.5W_Al2O3, Al₂O₃ factors influence the surface tension of the glass is 6.5.

Abstract: The effect of surfactant on improving the leaching rate of uranium was studied under both batch and column experiments. Batch experiments show that surfactant DMSS can improve the leaching rate and the the surface tension is decreased about 55.29%. 70 mg/l DMSS has the highest leaching rate of uranium , which close to the micellar concentration of DMSS. In the column study, with the addition of DMSS, the leaching rate of uranium is improved 8.3%. Thus the surfactant DMSS can accelerate leaching of uranium.

Abstract: In this paper, the experimental of pore diameter distribution characteristics of spunbond and meltblown composite nonwoven is carried out by using of gas bubble method. The influence of 7 kinds of wetting liquid to measurement results is studied, including of Galwick, Porefil, Silpore, Silwick, Dimethyl silicone, Isopropanol and Alcohol. The results show that wetting liquids of Galwick, Silwick and Dimethyl silicone can obtain the consistent value of pore diameter, meanwhile, have nearly normal distribution characteristics of pore diameter. Therefore, the wetting liquids of Galwick, Silwick and Dimethyl silicone are ideal wetting liquid for nonwoven. While the other four kinds of wetting liquid measurement results vary greatly, and don’t show normal distribution, they are not suitable as the wetting liquid of nonwoven by gas bubble method.

Abstract: An tungstate ionic liquid (IL) 2-(1-propyl-3-methyl-imidazolium) ([C₃mim]₂[WO₄]), was prepared. The density and surface tension of the IL were determined in the temperature range of (293.15 to 343.15) K. Using Kabo’s method and Rebelo’s method, the molar enthalpy of vaporization of the IL, Δ_l^gH_m⁰ (298 K), at 298 K and, Δ_l^gH_m⁰ (T_b), at hypothetical normal boiling point was estimated, respectively.

Abstract: The temperature dependence of physical properties of iron and their temperature peculiarities curves have been investigated. The influence of the time-temperature treatment (TTT) on the efficacy of the modification of iron including durable have been also determined.

Abstract: This paper presents the development of a new Copper-ABS feedstock material by the injection molding machine. The material consists of copper powder filled in an acrylonitrile butadiene styrene (ABS) binder and surfactant material. In this study, the effect of metal filled ABS and binder content on the contact angle and surface tension was investigated experimentally. The detailed formulations of compounding ratio with various combinations of a new Copper-ABS feedstock was done by volume percentage (vol. %). Based on the result obtained, an increment by vol. % of copper filler in ABS effected on contact angle and surface tension results. With highly filled copper content in ABS composites increase the surface tension value. It can be observed that, the tendency of the liquid surface that allow to resist an external force in PMC material through an injection molding process.

Abstract: The phenomena and behaviors of single droplet impacting on horizontal moving film have been studied by visual experiments, and the effects of viscosity and weber number (We) on the droplet impacting are analyzed. The experimental liquid is glycerol-water mixture with the volume fraction of glycerol 50%, 40%, 30%, and 10% respectively. We vary among 200 and 500. The results indicate that a higher viscosity plays an important role in hindering to droplet splashing, and the critical viscosity of splash increases with the increasing We. When We<242, the viscosity does not play a significant role to the height of the crown and the mid-jet. But when We>320, the jet height increases with the increasing We. The crown height of low viscosity liquid impacting significantly exceeds that of the high viscosity.

Abstract: The phenomenon of laminar flow in the micro-channel is demonstrated by the software simulation. It shows different velocity produces different flow layer. Water-in-oil droplets are obtained by the experiments. These experiments take water as the dispersed phase and take the oil as the continuous phase. Analyze forming process and forming factors of the droplets and the column flow. The main factors of forming droplets are surface tension, viscosity shear force and the liquid velocity. The size of droplet is associated with the flow and channel width of two liquids. Changing the pressure of the inlet can obtain droplets in different size.

Abstract: The addition of additives to the water is known to enhance boiling heat transfer. In the present investigation, boiling heat transfer coefficients are measured for Nichrome wire, immersed in saturated water with & without additive. An additive used is 2-Ethyl 1-Hexanol with varying concentrations in the range of 10-10000 ppm. Extensive experimentation of pool boiling is carried out above the critical heat flux. Boiling behavior i.e. bubble dynamics are observed at higher heat flux for nucleate boiling of water over wide ranges of concentration of additive in water. Results are encouraging and show that a small amount of surface active additive makes the nucleate boiling heat transfer coefficient considerably higher, and that there is an optimum additive (500-1000ppm) concentration for higher heat fluxes. An optimum level of enhancement is observed up to a certain amount of additive 500-1000ppm in the tested range. Thereafter significant enhancement is not observed. This enhancement may be due to change in thermo-physical properties i.e. mainly due to a reduction in surface tension of water in the presence of additive.