Abstract This paper describes the design of an enhanced, plane channel, flowcell and its use for testing large-scale coated plates (0.6 m × 0.22 m) in fully developed flow, over a wide range of Reynolds numbers, with low uncertainty. Two identical, hydraulically smooth plates were experimentally tested. Uniform biofilms were grown on clean surfaces to test skin friction changes resulting from different biofilm thickness and densities. A velocity survey of the flowcell measurement section, using laser Doppler anemometry, showed a consistent velocity profile and low turbulence intensity in the central flow channel. The skin friction coefficient was experimentally determined using a pressure drop method. Results correlate closely to previously published regression data, particularly at higher speeds. Repeated measurements indicated very low uncertainty. This study demonstrates this flowcell’s applicability for representing consistent frictional drag of ship hull surfaces, enabling comparability of hydrodynamic drag caused by surface roughness to the reference surface measurements.

中文翻译：

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增强型平面通道流通池中大型板的摩擦阻力测量

摘要 本文描述了增强型平面通道流通池的设计及其在充分发展的流动中测试大型涂层板 (0.6 m × 0.22 m) 的用途，雷诺数范围很广，不确定性低。实验测试了两个相同的液压光滑板。在干净的表面上生长均匀的生物膜，以测试由不同生物膜厚度和密度引起的皮肤摩擦变化。使用激光多普勒风速测量法对流通池测量部分进行的速度调查显示，中心流道中的速度分布一致且湍流强度较低。皮肤摩擦系数是使用压降法通过实验确定的。结果与之前发布的回归数据密切相关，尤其是在更高的速度下。重复测量表明不确定性非常低。这项研究证明了该流通池适用于表示船体表面的一致摩擦阻力，从而能够将表面粗糙度引起的流体动力阻力与参考表面测量值进行比较。