Spectral Attenuation of Sound in Dilute Suspensions with Nonlinear Particle Relaxation

Kandula, Max

PID  :  NTRS Document ID: 20130011777
RP-ID  :  KSC-2008-167

学科分类：声学和超声波

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Previous studies on the sound attenuation in particle-laden flows under Stokesian drag and conduction-controlled heat transfer have been extended to accommodate the nonlinear drag and heat transfer. It has been shown that for large particle-to-fluid density ratio, the particle Reynolds number bears a cubic relationship with (omega(tau))(sub d) (where omega is the circular frequency and (tau)(sub d) the Stokesian particle relaxation time). This dependence leads to the existence of a peak value in the linear absorption coefficient occurring at a finite value of(omega(tau))(sub d). Comparison of the predictions with the test data for the spectral attenuation of sound with water injection in a perfectly expanded supersonic air jet shows a satisfactory trend of the theory accounting for nonlinear particle relaxation processes.