Abstract
The effect of hydrodynamic focusing through a surface with multiple pores is investigated. The flow field of a single drop impacting a surface with n number of pores is established by solving the Laplace equation as a result of an instantaneous pressure impulse with complex analysis. The liquid velocity penetrating into the pores is derived and applied to find the critical penetration depth at which the impacting liquid ceases motion. It was found that the liquid penetration velocity rapidly diminishes as the number of pores increases. Implications for liquids splashing onto garments and the corresponding critical thickness such that liquid does not completely penetrate are discussed.
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