题目内容

A _______ consists of a fixed amount of mass, and no mass can cross its boundary.

A. closed system
B. open system
C. control volume
D. cycle

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The critical Reynolds number of a rough-walled pipe is about _______.

A. 3x106
B. system
C. 3x105
D. streamline
E. 2 000
F. pathline
G. particle
H. 1 500 7 A ___C____ is the locus of points traversed by a given particle as it travels in a field of flow; it provides us with a “ history ” of the particle’s locations.

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In the Eulerian description of motion the velocity vector, in general, depends on three space variables and time, that is, V=V(x, y, z, t). Such a flow is a _______.

A. three- dimensional flow
B. two-dimensional flow
C. one-dimensional flow
D. None of the above is true

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A _______ fluid is a fluid whose stress versus rate of strain curve is linear and passes through the origin.

A. Newtonian fluid
B. non-Newtonian fluid
C. turbulent flow
D. laminar flow

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The attractive forces between the molecules of a _______ are large that it tends to retain its shape.

A. liquid
B. fluid
C. gase
D. solid

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A _______ consists of a fixed amount of mass, and no mass can cross its boundary.

A. closed system B. open system C. control volume D. cycle

The critical Reynolds number of a rough-walled pipe is about _______.

In the Eulerian description of motion the velocity vector, in general, depends on three space variables and time, that is, V=V(x, y, z, t). Such a flow is a _______.

A _______ fluid is a fluid whose stress versus rate of strain curve is linear and passes through the origin.

The attractive forces between the molecules of a _______ are large that it tends to retain its shape.

A. closed system
B. open system
C. control volume
D. cycle