Numerical Simulation And Testing Study Of Air Distribution In The Non-unidirectional Clean Room

With the development of people' s life, clean room technology is being more and more widely used in industries and people' s daily life. The technology is extensively applied in those trades that have very high demands for manufacture settings such as health, microelectronics, microorganism, etc. Lots of domestic and foreign scientific researches prove that cleanliness in clean room is largely determined by efficiency of the high-efficiency filter and flow pattern. Non-unidirectional clean room is one kind of clean room. This kind of clean room both can fulfill most requirements in industries and can decrease equipment' s invest and running cost, so it is very widely used in the devise of clean room.Testing study and numerical simulation study are two most important methods to explore the principle of air distribution of clean room. Testing study needs relatively long cycle and much running cost, but numerical simulation study not only needs short cycle and little running cost but also can expediencely compare the varying devise. We may improve the design of the distribution of the clean room with the velocity field and pollutant concentration field that is gotten from the numerical simulation. So numerical simulation study is being more and more applied.Based upon the three-dimension stationary Navier-Strokes coupled equation and k- turbulent model and kechen turbulent model, the essay simulates the air distribution of the non-unidirectional clean room and compares and analyzes the results of two kinds of turbulence models. Inorder to verify the results of numerical simulation, some experiments are designed. Firstly the clean room model with the glassy material is designed to effectively observe fluid state, we draw the qualitatively conclusions: it is feasible to simulate the air distribution of clean room with CFD; numerical simulation of two turbulence models is viable. To further justify which turbulent model is more appropriate, primitive test is also performed: to collect date through experiment in the non-unidirectional clean room and compare it with the results of numerical simulation, and draw the quantitative conclusion that the results of k- turbulent model is more suitable than that of kechen.For years, design of air distribution of clean room is based upon experience, and there are no special quantitative requirements in the code for clean room. The essay achieves the simulation of the air distribution of non-unidirectional clean room with CFD and proves the conclusion of the simulation through tests; therefore it provides the feasibility to evaluate the design standard of air distribution in clean room by means of the not even coefficient and may serve as a reference to the design of clean room.