...
首页> 外文期刊>Ocean Engineering >Flow through nets and trawls of low porosity
【24h】

Flow through nets and trawls of low porosity

机译:流经低孔隙度的网和拖网

获取原文
获取原文并翻译 | 示例
           

摘要

In trawls intended for harvesting marine zooplankton the mesh size and twine thickness may be as small as O(10~(-4)m), the porosity less than 0.5 and the appropriate Reynolds number O(10~0-10~2). The flow locally through the meshes varies strongly with the Reynolds number in this range, and the entire flow field, filtered volume and drag of such nets therefore depend strongly on the net parameters and towing velocity.rnThis paper presents a simplified model for the flow through and forces on inclined permeable screens based on pressure drop considerations. For conical nets the model provides simple expressions for the filtration efficiency and drag as functions of twine diameter, mesh opening, porosity, taper angle and flow (towing) velocity. Comparisons with test tank measurements of typical plankton nets show good agreement.
机译:在用于捕捞海洋浮游动物的拖网中,网眼尺寸和细绳厚度可小至O(10〜(-4)m),孔隙率小于0.5和适当的雷诺数O(10〜0-10〜2)。在此范围内,通过网孔的局部流量随雷诺数变化很大,因此,此类网的整个流场,过滤量和阻力在很大程度上取决于网参数和牵引速度。rn本文提出了一种简化的流过模型。基于压力降的考虑因素,对倾斜的可渗透筛网施加力。对于圆锥形网,该模型提供了过滤效率和阻力的简单表达式,它们是细绳直径,筛孔,孔隙率,锥角和流动(牵引)速度的函数。与典型浮游生物网的测试池测量结果的比较显示出很好的一致性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号