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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 _d (where is the circular frequency and _d is 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 _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. ©2008 Acoustical Society of America

Contents

• Introduction
• Analysis for sound attentuation
  • A.Nonlinear particle drag and heat transfer
  • B.Droplet Reynolds number
• Results and comparison
  • A.Effect of nonlinear particle relaxation
  • B.Comparison with experimental data
• Conclusion
• Acknowledgments
• REFERENCES
• FIGURES