A numerical study on particle behaviors of fluid flow in pulverizer

Abstract

Abstract In the case of the developed countries, pulveriser systems exhibit a high level of sophistication, but competitive pressures threaten family farm units and rural communities. Also, the improvement of the added values of existing products has been concentrated. Until now, high-speed rotary milling machine which be capable of producing 20 kg/h of materials containing a large amount of fat without heat denaturation of about 20μm or less has not yet been commercialized in the world. There are two air stream mill techniques such as the jet and high-speed rotary mill methods among the air stream-type pulverizing method in the world markets. However, the high-speed rotary mill method is known as the only method of crushing the raw materials not only soybeans, but also coffee. In order to optimise the pulverised fluid flow, many aspects need to be taken into account. The objective of this paper is concentrated on a technique that can be finely pulverized to submicron size while maintaining the composition and nutrition without heat denaturation. First, a FEA (Finite Element Analysis) that the optimal number of revolution as input parameter is obtained through the impulse analysis to minimize the thermal denaturation has been carried out. Second, the optimum inlet velocity for producing particles less than 20μm is derived by checking the particle size distributions which employed particle behaviour analysis. Finally, the relationship between the flow and the kinetic characteristics of particles generated by crushing of soybeans for the development of high-speed rotary milling machine using the developed FEA models has been discussed