单通道滚筒干燥机内温度场和流场数值模拟

东北大学硕士学位论文AbstractNumerical Simulation of Temperature Field andFluid Field within the Single Channel Drum DryerAbstractThe single channel drum dryer works in a main way of drying with convention.It hasbeen widely used in the fields of chemistry,light industry,coal,building materials andmetallurgy.This article describes the working principle of the drum dryer and fluid dynamicsoftware FLUENT is used to analysis and research in the paper.It can get the simulationresults which guide the actual dry operation.Pre-treatment technology is applied to complete the work of dividing grid,and then aseries of setup and analysis should be done in the post-processing.The analysis of this issue ismainly considered between the gas phase and gas-solid phase.The simulation of gas phase isrelatively simple and the chosen physical models are few,so it iterates fast.Change the size ofthe air inlet,simulate flow field of gas phase again and analysis the results which has beenchanged.The analysis of gas-solid phase can refer to the simulation results of the gas analysis.It is complex to research the process of the gas-solid phase.And the standard k-smodel,evaporation model,hybrid model and component transport model are chosen tosimulate the fluid flow.Besides,SIMPLE algorithm is selected.Inlet and outlet arerespectively imposed on velocity boundary condition and pressure boundary condition.Afterthe simulation,the velocity distribution,the temperature distribution and the pressuredistribution can get.Transform the program,for example,increase windshield board,andsimulate the gas-solid phase once more.Contrast to these distribution picture,it conclude thatthe windshield board interfere with the flow of air,which not only is energy made full use of,but also maximum velocity is reduced,particle residence time is increased and drying qualityis improved.Uniform and Rammler Rosin-methods are selected to define particle size distributionand use discrete phase model to simulate particle trajectory in order to simulate the particlediameter distribution and particle retention time distribution.Then draw a conclusion:thesmall particle diameter follows better properties and is more subject to hot air.The largerparticle diameter is,the greater inertia and centrifugal force are.Ⅲ-