流量計的儀表常數即雷諾數的介紹： 測量管內流體流量時往往必須了解其流動狀態、流速分布等。雷諾數就是表征流體流動特性的一個重要參數。 流體流動時的慣性力Fg和粘性力(內摩擦力)Fm之比稱為雷諾數。用符號Re表示。Re是一個無因次量。 流體力學中表征粘性影響的相似準數。為紀念O.雷諾而命名，記作Re。Re=ρvL/μ，ρ、μ為流體密度和動力粘度，v、L為流場的特征速度
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