I assumed friction when I talked about pressure drop
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送交者: gyro 于 2010-01-04, 14:43:53:
回答: 经验似乎是:堵住管子速度会变大。你的意思是这必须用粘性来解释? 由 lightman 于 2010-01-04, 14:13:59:
The pressure decreases along the flow, to overcome friction force.
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