Abstract:To provide foundation for optimal design of the filter and the inlet and outlet of the tunnel, dynamics method was used to analyze the mechanism of air purifier and deduce theoretically filter resistance in absorption process. Starting from the internal air flow field in an air purifier, a geometric model of internal wind field was built and porous medium was adopted to simulate the filter. Fluent software was applied to numerically simulate internal wind flow. The different values of pressure field and velocity field were measured and analyzed on three crosssections of different heights (0.05 m, 010 m and 015 m) with inlet velocity changing from 1 to 5 m/s. The results show that the wind flow remains steady when inlet velocity is 1-2 m/s, HEPA filter produces the strongest flow resistance at section of 0.10 m high. Therefore, the area of air inlet and outlet should be increased to be consistent with the main wind channel so as to get better internal flow field and meanwhile to avoid vortex phenomenon and lower flow superposition effect at the outlet. Fluent software simulation produces effective results and can provide theoretical basis for solving flow field issues in practice.
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