Estimate of the energy spectrum characteristics of shock processes in a fluid

It follows from the results obtained that the upper frequency of possible local pulsations in a fluid is determined by two factors: the quantityα, which depends on the kinematic viscosity of the fluid Υ, the mean velocity of the nonstationary flow vav, the tube diameter d, and the relative depth of the shock process characterized by the parameter\((\sqrt 3 /8)(\mu c/v_{av} ) \simeq 0.2\tilde v/v_{av} \).