Hot Glue Machine,Industrial Hot Glue Machine,Hot Melt Glue Machine,Automatic Hot Glue Dispenser Dongguan Jinwang Ultrasonic Equipment Co.,Ltd , https://www.jwultrasonic.com
Static mixer
Mixing operations are extremely common and important processes , such as gas - liquid contact, extraction, reaction, heat transfer, etc. are all related to mixing. Static mixer is a new type of unit equipment . It started late in this field in China . Usually , it is mostly used to imitate equipment in other countries. It has not conducted in-depth research on the mixing mechanism of static mixer itself. This paper aims at mixing mechanism of a static mixer for in-depth research, zui final purpose of this study is to improve the mixing efficiency of static mixers and provide a theoretical basis for the design and manufacture. In this paper , the mixing mechanism of the flow field in a static mixer is studied. Studies have shown that fluids have two flow patterns , laminar flow and turbulent flow in a static mixer . When laminar flow is "split position, recombining," the three elements and the fluid is regularly repeated action, to achieve mixing. When the turbulence, in addition to the above three elements, the direction of fluid creates a vortex in the flow cross-section, so that the fluid is divided finely, then mixed. By vorticity equation calculated flow field of the inner tube, plotted versus time vorticity qualitative results: vorticity with the movement time and position continue to decay. The flow field distribution in a static mixer is an incompressible viscous flow distribution. Theoretical calculations show that the velocity distribution satisfies the Navier - Stokes equation , and in the case of low Reynolds numbers , the equation is a linear equation and has its exact analytical solution. The motion and force of fluid flow in a static mixer was investigated. Studies have shown that the flowing material passes through a static mixer, there are four basic motion: split stream; stream change direction; the opposite outer stream; then the mixture. There are three forces affect droplet formation, i.e. the shear stress, the surface tension of the liquid, viscous stress in the dispersed phase. In the turbulent state , the shear stress and the surface tension of the liquid are the main factors determining the droplet size , and the viscous stress is often negligible. The static mixer hydraulic parameters and pressure drop were calculated. Calculations show that the pressure drop static mixer is the number of times an empty tube while the flow rate of resistance and viscosity with changes; connection status component helix angle, the smoothness of the front and rear edges of the module, and the shape deviations of the neighboring cell assembly Etc. also has an effect on flow resistance ; the coefficient of friction is independent of the number of components. The heat transfer mechanism of the fluid was studied. Studies have shown that, regardless of the fluid in the mixing tube which is in fluid state are heat transfer boundary laminar boundary layer. The theoretical calculation formula of heat transfer number and boundary layer length is obtained by summarizing the energy equation of the laminar boundary layer in the tube and solving the energy equation. Through the experimental curve, it is found that the mixing number of the mixing unit is very important for the mixing effect of the static mixer . When the number of mixing components exceeds four , the velocity pulse value at the outlet of the static mixer tends to be constant , that is , when there are too many mixing components , the turbulence intensity of the fluid cannot be further increased. The degree of fluid mixing is uniquely determined by the number of units in the mixer , regardless of the velocity, viscosity, and pressure of the fluid. After analyzing the shortcomings of traditional static mixers , zui theoretically designed a low-shear, high-performance static mixer .