Frictional resistance of antifouling coating systems
Frictional resistance of antifouling coating systems
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DOI：
10.1115/1.1845552
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发表时间：
2004-11-01
影响因子：
2
通讯作者：
Schultz, MP
中科院分区：
文献类型：
--
作者：
Schultz, MP
我们进行了一项实验研究，比较了几种船舶大厅涂层在未污染、污染和清洁条件下的摩擦阻力。水动力测试是在拖曳水箱中完成的，使用平板测试夹具，根据板长度和拖曳速度，以 2.8 x 10(6) -5.5 x 10(6) 的雷诺数 (Re-L) 范围进行拖曳。结果表明，在未污染条件下，涂层之间的摩擦阻力系数（C-F）差异不大。经过 287 天的海洋暴露后，观察到显着差异，其中有机硅防污涂料的 CF 增加最大。虽然一些表面在清洁后恢复到接近未污染的电阻，但涂层损坏导致其他涂层的 CF 显着增加。当中心线平均高度 (k = 0.17R(a)) 用作粗糙度长度尺度时，未污染涂层的粗糙度函数 Delta U+ 显示出对 Colebrook 型粗糙度函数的合理塌陷。使用基于藤壶高度和覆盖百分比的新粗糙度长度尺度，获得了藤壶污垢表面粗糙度函数的出色崩溃。
An experimental study has been made to compare the frictional resistance of several ship hall coatings in the unfouled, fouled, and cleaned conditions. Hydrodynamic tests were completed in a towing tank using a flat plate test fixture towed at a Reynolds number (Re-L) range of 2.8 x 10(6) -5.5 x 10(6) based on the plate length and towing velocity. The results indicate little difference in frictional resistance coefficient (C-F) among the coatings in the unfouled condition. Significant differences were observed after 287 days of marine exposure, with the silicone antifouling coatings showing the largest increases in CF. While several of the surfaces returned to near their unfouled resistance after cleaning, coating damage led to significant increases in CF for other coatings. The roughness function Delta U+ for the unfouled coatings showed reasonable collapse to a Colebrook-type roughness function when the centerline average height (k =0.17R(a)) was used as the roughness length scale. Excellent collapse of the roughness function for the barnacle,fouled surfaces was obtained using a new roughness length scale based on the barnacle height and percent coverage.