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The square root of the ratio of the inertia force due to flow to the elastic force of fluid is known as-

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RRB JE ME CBT 2 Previous Paper 2: Held on 31 Aug 2019
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  1. Mach number 
  2. Strouhal number
  3. Froude number 
  4. Reynolds number

Answer (Detailed Solution Below)

Option 1 : Mach number 
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Detailed Solution

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Explanation:

Mach number

Mach number is defined as the ratio of inertia force to elastic force.

For the compressible fluid flow, Mach number is an important dimensionless parameter. On the basis of the Mach number, the flow is defined.

Mach Number

Type of flow

M < 0.8

Sub-sonic flow

0.8 < M <1.3

Trans-sonic

M = 1

Sonic flow

1.3 < M < 5

Super-sonic flow

M > 5

Hypersonic flow

Other important dimensionless numbers are described in the table below

Reynold’s number

Froude Number

Euler number

Weber Number

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