FIG. 1.

(a) The experiment setup to simulate mucus plug dynamics in a collapsed lung airway of the 12th generation. (b) A C940-gel plug in the PDMS channel. (c) The channel dimensions: $a$—half channel width and $h$—channel height. From Hu et al., Fluid-Structure-Sound Interactions and Control. Proceedings of the 2nd Symposium on Fluid-Structure-Sound Interactions and Control, Lecture Notes in Mechanical Engineering 2014, Hong Kong, Macau, May 20–May 23 2013, edited by Y. Zhou, Y. Liu, L. Huang, and D. H. Hodges. Copyright 2013 Springer Science and Business Media. Reproduced with permission from Springer Science and Business Media.