Numerical Simulation And Optimization Research On Effervescent Atomization Process Of Soy Protein Adhesive

Soy protein adhesive is used in wood-based panel production for its renewable advantages of short production cycle, large output, low cost, no free formaldehyde release to solve the problems on environment and energy which are caused by aldehydes adhesive. Nevertheless, its non-Newtonian fluid properties and high viscosity characteristic determine the poor atomization quality of common atomization method. Effervescent atomization is a kind of method which can achieve high viscosity liquid atomization. Research on effervescent atomization mechanism has analyzed the flow characteristics of soy protein adhesive and established of the constitutive equation, analysis of the effervescent atomization process has designed an effervescent atomization nozzle and work system that is suitable for soy protein adhesive, which have important theoretical significance and practical application value on soy protein adhesive application on fiberboard.Based on the theory of fluid mechanics theory, this paper has analyzed on effervescent atomization process of soy protein adhesive. According to flow characteristics of soy protein adhesive, combining the constitutive equation of non-Newtonian fluid, it can obtain that the constitutive equation of soy protein adhesive inside the effervescent atomization nozzle conforms to the power law model. Analysis of atomization process on the effervescent atomizing nozzle can obtain that the generation of atomization effect is through the overcoming of the surface tension. According to the research on effervescent atomization nozzle, the nozzle structure and the work conditions are analyzed for atomization effect of effervescent atomizing nozzle which can provide theoretical basis for optimization of the nozzle structure and the work conditions.Using the method of computational fluid dynamics, the effervescent atomization process is simulated. According to the application situation of effervescent atomizing technology, this paper has discussed the work plan of the evaluation on numerical simulation of effervescent atomization process with soy protein adhesive and analyzed basis contents, work conditions and evaluation methods. Using soy protein adhesive and water as the research object, a hybrid numerical simulation has analyzed the flow condition of non-Newtonian fluid and Newtonian fluid inside the effervescent atomization nozzle. Then a discrete numerical simulation by soy protein adhesive and air in the downstream of the nozzle fog has analyzed particle size distribution and particle size distribution of soy protein adhesive after atomization. All of them have proved that effervescent atomization is a feasible method to achieve atomization of soy protein adhesive.According to the parameters optimization of atomization on soy protein adhesive, hybrid numerical simulations of soy protein adhesive and air in different ALR are simulated. By observing the distribution of flow field under different ALR, the consumption of total energy and the atomization gas has been calculated and the best gas liquid ratio has been obtained. Then with discrete numerical simulation method on the validation, has proved that the theory of ALR is correct.According to the physical and chemical properties of soy protein adhesive, the results of numerical simulation and effervescent atomization theory, the work system of effervescent atomization for soy protein adhesive has designed. According to the properties of high viscosity of soy protein adhesive, it has analyzed the composition of work system. Based on the work parameters of numerical simulation and the best ALR, it has chosen and designed the structure of effervescent atomization nozzle and other important devices.The research, on effervescent atomization process of soy protein adhesive has deep analyzed the whole bubble process during the production to the atomization. The numerical simulation has done with the method of computational fluid dynamics. The work system has been designed according to the work conditions and results of simulation. All of these provide theoretical basis and technical support for application of soy protein adhesive.