The morphology of particle agglomerates on a cylindrical fiber was observed carefully in the collection mechanisms of inertia and interception. Based on the observation, the contribution of filtration and operation conditions, such as Stokes number, interception parameter, filtration time and so on were discussed. For particles having a small interception parameter, captured particles tend to grow in a transverse direction to the mean air flow when particle inertia is small, so that the maximum

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... deposition appears at a certain angle from the front stagnation point, and then it shifts to a smaller angle as inertia increases. Even when particles have a large interception parameter, the general feature of the deposition pattern against particle inertia is maintained, but the particles form porous and complicated agglomerates.