We model the lung parenchyma as an elastic half-space and the pleura as a taut elastic membrane in smooth or in welded contact with the half-space. In each instance we deduce that the presence of a sufficiently high surface tension T in the pleural membrane will lead to the existence of a cutoff frequency f0 for the Rayleigh-type surface waves, and we derive an equation which gives T in terms of f0 and parameters that characterize the layered medium. We performed experiments on four inflated horse lungs at transpulmonary pressures of 5, 10, and 15 cmH2O. A comparison of the experimental results and the theoretical predictions provides an empirical test to the validity of the modeling.
Effect of Pleural Membrane on the Propagation of Rayleigh-Type Surface Waves in Inflated Lungs
Man, C., Jahed, M., Lai-Fook, S. J., and Bhagat, P. K. (September 1, 1991). "Effect of Pleural Membrane on the Propagation of Rayleigh-Type Surface Waves in Inflated Lungs." ASME. J. Appl. Mech. September 1991; 58(3): 731–737. https://doi.org/10.1115/1.2897256
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