Creating corners in kitchen sinks
Creating corners in kitchen sinks
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在厨房水槽中创造角落
作者：
C. Ellegaard;A. E. Hansen;A. Haaning;Hansen Kim;Anders Marcussen;T. Bohr;J. L. Hansen;S. Watanabe
当来自喷嘴的垂直液体射流撞击平坦表面时，就像自来水撞击厨房水槽一样，水流形成的环中会出现不连续性。在这种变形时，水的深度在距射流一定距离处突然改变（“圆形水跃”，，，，）。我们现在发现，如果射流中含有比水更粘稠的液体，就会形成静止的多边形图案，从而打破轴对称性。多边形的尖角承载着较大的径向通量，而侧面则对水流产生阻力。
When a vertical jet of liquid from a nozzle hits a flat surface, as in tap water striking the kitchen sink, a discontinuity appears in a ring created by the flow. At this deformation the depth of the water alters abruptly (the ‘circular hydraulic jump’,,,,) at some distance from the jet. We have now discovered that if the jet contains a liquid more viscous than water, stationary polygonal patterns form, breaking axial symmetry. The sharp corners of the polygons carry a large radial flux, while the sides generate resistance to the stream.