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Force interaction of boiling dispersed emulsion particles

Klimov R. A.

Journal of New Technologies in Environmental Science

2018

Vol. 2, nr 2

60--67

In the industry lubricating fluids are widely used, mostly they reduce the wear of cutting tools and improve the quality of working surface, both in metal processin g technology and in other industries [1-3]. To achieve the greatest effect lubricating fluids must have a good surface wettability. This is achieved by introducing into the lubricating fluids the corresponding surface active agents (SAA), which also increase the cooling capacity of the medium. The adsorption phenomenon is based on the lubricating effect of various components of lubricating fluids. For liquids the adsorption is determined by the change in surface tension σ from the concentration of SAA. The desorption phenomena of SAA and particles aggregation of dispersed phase of lubricating fluids, which is an emulsion, determines sedimentation stability of emulsion and its further use [2, 4-7]. To reduce costs it is economically feasible to reuse spent lubricating fluids, but for this, their composition must be brought to normative, i.e. to clear it of mechanical impurities and also get the most stable structure for sedimentation, i.e. it is necessary to obtain the smallest size of the dispersed phase [5, 8-10]. Existing methods for calculating the processes of emulsification and homogenization of lubricating fluids are based on the dynamics of a single particle, which either boils with a sudden change in external parameters [4-6, 8, 11], or is subjected to the action of dynamic impact during the acceleration (deceleration) of flow, as well as is subjected to mechanical effects [7, 9, 11]. The examination of the dynamic interaction of two particles while boiling of light boiling component of the emulsion is given in [12]. Therefore, the study and development of the theoretical grounds of multitude drops breakup of discretely distributed phase is important for the determination of the optimal dispersion modes which results in a significant reduction in energy costs both during the grinding and crushing process, as well as reduction of the financial costs with repeated use of the same lubricating fluids, previously prepared before each cycle of use.

Biodegradable lubricating greases for special work conditions

Florea O., Matei V.

Scientific Problems of Machines Operation and Maintenance

2009

Vol. 44, nr 4

21-28

Lubricants facilitate the effective operation of mechanical equipment, reducing friction and wear, but at the same time, they represent a large and diffuse pollution source both in soil and in water. Eliminating or reducing the formation of pollutants and waste pollution prevention makes an important contribution to environmental protection. Biodegradable lubricants represent the technical and environmental alternative for conventional lubrication. Lubricating greases are considered as colloidal dispersions of a thickener in a lubricating fluid. Their biodegradable properties and their lubricating ability depend on the main components: base oil, thickener, and the additives. The aim of our work is to find the most suitable formulations of ecological lubricating greases having good performances, in order to use them as multifunctional lubricants.