This paper presents an improved method for time-domain modelling of transient laminar flow through tapered tubes. This method is based on the transmission line method (TLM), a technique using transfer functions and delays to calculate the pressures and/or flows at the ends of the tube. However, unlike previous methods that are limited to non-tapered tubes or are inaccurate at low frequencies, the method presented here is applicable across a wide range of taper ratios, dissipation numbers, and frequency content. The new model is compared in the frequency domain to a boundary value problem solution and in the time domain to a method of characteristics solution.

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