60-61 Performance evaluation of lined duct bends -Experiment vs. theory


  • Ramani Ramakrishnan Department of Architectural Science, Ryerson University, Toronto, ON, Canada
  • Romain Dumoulin ETS, Montreal, QC, Canada


Acoustic spectroscopy, Climate control, Numerical analysis, Acoustic propagation, Acoustical performance, Empirical relations, Field measurement, High frequency, HVAC system, In-buildings, Lined ducts, Liner material, Performance evaluation, Propagation constant


Acoustical performances of simple elbow silencers, used in building HVAC systems, have been conventionally evaluated using empirical relations based on laboratory and/or field measurements. The current investigation has made use of COMSOL, a powerful multiphvsics numerical analysis tool and has attempted to provide results based on multi-dimensional analysis. The acoustic propagation in the liner material uses the complex propagation constant and complex density of bulk reacting material. A given acoustic field was assumed at the inlet of the elbow and the outlet is connected to a long anechoic termination. To accommodate high frequency calculation, COMSOL suggests using a length of pipe in front of the elbow within which scattered acoustic field is calculated to provide the required acoustic field at the inlet of the lined (or unlined) elbow.

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How to Cite

Ramakrishnan R, Dumoulin R. 60-61 Performance evaluation of lined duct bends -Experiment vs. theory. Canadian Acoustics [Internet]. 2012 Sep. 1 [cited 2024 Jul. 13];40(3):60-1. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2539



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