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18821677827金蟲 (正式寫手)
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[求助]
一小段英文,謝謝大佬。
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| 這是因為摩擦系數(shù)f與壓力降成正比,脈動流是由定常流疊加一個強制振動流,故脈動流的流量隨時間呈周期性變化,進而致使壓力降呈現(xiàn)周期性變化,最終致使摩擦系數(shù)f呈現(xiàn)周期性變化。定常流場下流體流量維持恒定,致使摩擦系數(shù)幾乎沒有變化。 |

木蟲 (正式寫手)
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試一下啊, 講究著用: A factor is that the friction coefficient (f) is proportional to the pressure drop. The pulsating flow is composed of a steady flow superimposed with a forced vibration flow, and changes periodically with time, which in turn causes the pressure drop to show periodic changes, hence the friction coefficient (f) gives the periodic changes. The friction coefficient hardly changes if the fluid flow is kept constant under the stationary flow field. |

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