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Numerical Simulation of Nano-TiO2Air Cleaning Devices Based on Optical Fiber Technology

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Tutor: HeGuoGeng
School: Huazhong University of Science and Technology
Course: Refrigeration and Cryogenic Engineering
Keywords: Air purification,photocatalytic,gas-solid two-phase flow,the trajectory of parti
CLC: TU834.8
Type: Master's thesis
Year:  2013
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Abstract:
Contemporary architecture use more closed decoration, decoration materials andfurniture spilled out formaldehyde, ammonia, benzene, particles, biological contaminantsand volatile organic compounds, so people paid more and more attention on indoor airpurification technology. In this paper we analyzes nano-TiO2photocatalytic degradationmechanism of organic pollutants in the air and introduced a device of photocatalyticdegradation of organic compounds based on fiber optic technology¡ª¡ªmop fan, wesimplify the device, in this paper£¬ we have done some gas-solid flow numerical analysisand wall reaction numerical analysis.Common experimental methods are organic particles flow along the fiber direction andcontingency attached on the fiber, and none of the numerical simulation of chemicalreaction process and distribution of organic particles in the device has been done. Themain innovations of this paper is that the organic particles cross swept the fibers andcollision with the fibers£¬during the multiple collisions a catalytic reaction has reacted, andwe simulated the catalytic reaction of organic particles in the device.Four boundary conditions for the deviceare used in this paper, they are£ºVelocityinletboundary condition, outflow boundary condition, pressure outlet boundary conditionand wall boundary condition.Velocity Inlet boundary conditionis used in discrete phasesimulation and wall chemical reaction simulation, outflow boundary conditions is used inthe discrete collision simulation£¬pressure outlet boundary conditions is used in the thewall chemical reaction outlet conditions, all other boundary is set as the wall boundaryconditions, the default setting is no-slip condition.This paper use CFD software to simulate the collision between organic particles andfiber from different fiber arrangement, different fiber diameters and different inlet velocity,and analysed the trajectory and the residual time of particles in the device£¬after thesimulation we got two optimum devices. The paper also use user-defined chemicalreaction model to simulate the photocatalytic chemical reaction the in the device, thesimulation based on the organic particles¡¯ chemical reaction analogous to the pulverizedcoal combustion chemical reaction£¬after simulation we got a most optimum device model.
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