helical loop 中文意思是什麼
helical loop
解釋
小圈曲-
When f is about fr, for curved pipes, the secondary flow appears eight vortexes for annular cross section and four for circular and four or six for elliptical ; for helical pipe, the secondary flow appears as a loop flow for annular and circular cross section, and a saddle flow for elliptical cross section
當f在fr左右時,對于彎管,環形截面上存在八個渦,圓截面上存在四個渦,橢圓截面上存在四個或六個渦;對于螺旋管,圓截面和環形截面上二次流表現為環流,橢圓截面上表現為鞍流。
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