PREDICTION OF THE PROPAGATION AND LEAKAGE OF TORSIONAL WAVES IN A WAVEGUIDE OF ARBITRARY CROSS‐SECTION IMMERSED IN A FLUID

A Semi‐Analytical Finite Element (SAFE) method is developed to model accurately the propagation velocity and leakage of guided waves along an immersed waveguide with arbitrary non‐circular cross‐section. Thus an accurate inverse model is provided to measure the density of the fluid by measuring the change of the torsional wave speed. Experimental results obtained with a rectangular bar in a range of fluids show good agreement with the theoretical predictions.