Abstract
The collection efficiencies and pressure drops across model grid filters were measured as a function of particle size, gas composition, and flow rate. The monodisperse, latex spheres ranged from 0.36 to 1.0 μm. Measurements indicated that the pressure drop could be correlated with the Fuch-Stechkina equation with a constant C HK ⋍ 0.52 . These results for the argon-helium mixtures had been previously reported for air and nitrogen. A modified channeling model was developed to relate the overall efficiency measurements to a single fiber efficiency. Electron micrographs and measurements with filters of different thicknesses were consistent with the model. The single fiber efficiency was found to be a function of Stokes number alone for Stk > 0.2. At lower Stokes number, the efficiency was a function of both the Reynolds and Stokes numbers. Qualitative agreement was found with the shape of the curve between experiment and trajectory calculations based on the Kuwabara model. However, these calculations considerably underestimated the collection efficiency which was found to agree quantitatively with a trajectory calculation based on potential flow at large Stokes numbers.
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