Abstract
A study has been made of the pressure-time relationships existing during the impact of water drops on fabric surfaces. The impact was recorded by a high-speed motion-picture camera. Calculations of the pressure exerted by the waterdrop, the depth of penetration, and the manner in which the waterdrop deforms during impact are given. The theory described gives important principles that could be used for the design of water-repellent fabrics. If the fabric surface is plain the pores must be small so that the pressure required to force water through them will be high. An alternative or complementary method is to make the fabric surface highly compressible (e.g., raised fabrics); the pressure exerted by the raindrops will be much smaller than in the former case. The requirements for the testing of water-repellent fabrics are examined in the light of the theo retical and experimental results reported herein.
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