Use of bulk modulus in dimensionless numbers The value of bulk modulus of a fluid (or equivalently speed of sound) is required to evaluate which engineering number? Choose the correct option.

Mechanical Engineering Hydraulics and Fluid Mechanics Difficulty: Easy
Choose an option
  • A
    Reynolds number
  • B
    Froude number
  • C
    Mach number
  • D
    Euler number

Answer

Correct Answer: Mach number

Explanation

Concept/Approach

  • Mach number M = V / c, where c = speed of sound = √(bulk modulus / density). Hence bulk modulus is essential for compressibility/sonic effects captured by Mach number.

Final AnswerMach number

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