Film Forming Characteristics of Oil-in-Water Emulsion with Super-Low Oil Concentration

2009 ◽  
pp. 188-190 ◽  
Author(s):  
Ma Liran ◽  
Luo Jianbin ◽  
Zhang Chenhui
Author(s):  
Liran Ma ◽  
Jianbin Luo ◽  
Chenhui Zhang ◽  
Shuhai Liu ◽  
Xinchun Lu ◽  
...  

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
Sy-Wei Lo ◽  
Tzu-Chun Yang ◽  
Yong-An Cian ◽  
Kuo-Cheng Huang

A model for oil-in-water emulsion has been developed in this paper. A group of viscosity coefficients transiting smoothly and incessantly from the thick film region to the thin film region is defined. The contributions from disperse and continuous phases to the total lubricant pressure and pressure gradient are functions of the oil concentration and the film thickness. The parameters used in these functions are determined by a series of computational fluid dynamics simulations. The onset of inversion and the viscosity after inversion are also investigated. It is found that the critical volume fraction of oil in the inception of inversion is dependent on the oil viscosity and a factor regarding the combined effects from the emulsifier, pH value, droplet size, and the shear rate. A series of simulations using the proposed model has been carried out and compared with the experimental results, such as the film thickness and the extension of oil pool for various rolling speeds and supply oil concentrations. The numerical outputs are basically in agreement with the experiments.


Author(s):  
Jianbin Luo ◽  
Liran Ma

The oil-in-water emulsion has been widely used as lubricant in metal working such as metal rolling and cutting. The film formation ability of emulsion was considered as an important factor for evaluating the lubricating effectiveness. Although the film formation characteristics have been widely investigated, the mechanism is still not well understood. Furthermore there were seldom results reported on the emulsion with an oil volume percentage less than 1%. The film formation characteristic of emulsions with ultra-low oil concentration (0.005vol%) between a smooth plate and a highly polished steel ball was investigated. The effects of oil concentration and emulsifier concentration were investigated. New viewpoints on the film formation mechanism of emulsion were proposed.


2021 ◽  
pp. 152808372110408
Author(s):  
Chandra Jeet Singh ◽  
Samrat Mukhopadhyay ◽  
Raju Seenivasan Rengasamy

Many industries discharge oil-in-water emulsion in the waste stream, often above the permissible limit causing serious environmental hazards. Porous media such as membrane and coalescence beds are employed to treat oily wastewater. A coalescence bed filter consists of either fibrous or granular packing and is used for removing larger oil droplets less than 100 μm from secondary emulsions. Fibrous media have higher porosities and specific surface areas than coarse granular media and hence give higher oil removal efficiency. To design an efficient fibrous coalescence bed filter for treating industrial discharge, understanding the mechanism of oil separation is important. This involves the surface wettability of fibers relating to surface chemistry and roughness. Further, fiber diameter, filter bed’s height, porosity, and pore size in relation to the oil droplet size and throughput and influent oil concentration are interactive parameters that affect the efficiency of coalescence. The performance of coalescence filtration is evaluated by analyzing the oil concentrations and D50 droplet sizes in the influent and effluent. In this article, the above-mentioned subjects are comprehensively reviewed from the reported research works, which highlights the complex nature of fibrous coalescence filtration.


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