Numerical Simulation Of Heat Transfer Performance By Ultrasonic Evaporator

In the process of chemical production,they’re the main focused problem that how to improve heat transfer intensity effectively,to save energy consumption and to reduce production operation cost.However,they’re common problems that high energy consumption and low yield in the traditional evaporators.How to optimize and improve evaporators become an urgent problem to be solved in the current chemical production.The application of ultrasonic technology to the evaporation unit was put forward in this paper,which combined with ultrasonic and evaporation characteristics,so we design a new type of evaporation device operation and be reasonable optimization of evaporation process,in order to study the heat transfer performance of experiments and to analyse the numerical simulation.This article uses the research to design and manufacture of ultrasonic evaporation device,which carried out pure water to strengthening heat transfer experiment,and combined with the experiment of ultrasonic heating evaporator interior flow field and temperature field numerical simulation,optimization and technical improvement of the technology of.ultrasonic guidance evaporator to provide the reference.The following conclusions:1)To single factor experiment,this article selects the fixed effect model of feed rate,evaporation temperature,power density which analyzed in single factor experiment,and combined with experimental data for the establishment of the single factor regression model,through the verification results show that the accuracy of the regression model,which can be used to predict single factor under the condition of heat transfer coefficient.The best operating parameters respectively,the single factor experimental conditions for the feed rate of 40L/h,evaporation temperature 70℃,power density of 0.8 A.2)Uniform design experiment,in the design of the analysis of the effect of dual factors on the heat transfer coefficient,set up double factors under the condition of optimum operating parameters,and to establish the heat transfer coefficient and regression equation of the operating parameters,put forward applicability of regression equation under experimental conditions.The best operating parameters of the feed rate of 30 L/h-55 L/h,evaporation temperature of 70℃-90℃,power density of OA-1.2 A in using experimental design.3)Using FLUENT for ultrasonic heating evaporator of indoor heat transfer performance to the numerical simulation of flow field and temperature field.The image of characterization of the tube boiling state of ultrasonic cavitation,wall shear stress and outlet pipe plate were analyzed,and concluded that inner loop in nucleate boiling violent turbulent,to guide the process improvement and optimization of ultrasonic evaporator reasonable reference is put forward.