题目内容

Two fluid flow patterns are ______ and ______ . Reynolds number can be used to judge the flow pattern. The expression of Reynolds number in circular pipe is Re=______ . And the corresponding critical value of Re is ______ .

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The force acting on the fluid can be divided into two types, including ______ and ______ .

What kind of approach can be used to describe fluid flow in fluid dynamics?

A. Lagrangian approach
B. Reynolds approach
C. Bernoulli approach
D. Eulerian approach

In approximate models, ( ) is widely used in model experiments about oil flow.

A. Froude model
B. Reynolds model
C. Euler model
D. Complete similitude model

Commonly, the equipment used for measuring velocity and flow rate in engineering are ______ and ______ .

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