@article{Ramakrishnan_Dumoulin_2012, title={60-61 Performance evaluation of lined duct bends -Experiment vs. theory}, volume={40}, url={https://jcaa.caa-aca.ca/index.php/jcaa/article/view/2539}, abstractNote={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.}, number={3}, journal={Canadian Acoustics}, author={Ramakrishnan, Ramani and Dumoulin, Romain}, year={2012}, month={Sep.}, pages={60–61} }