  This text is a compilation of some of the notes that the author has written
during the development of the low-order model "DICO" [2, 8, 10, 11] for vowel
phonation and the even more rudimentary glottal flow model [9] for processing
high-speed glottal video data. The following subject matters are covered: (i)
Incompressible, laminar, lossless flow models for idealised rectangular and
wedge shape vocal fold geometries. Equations of motion and the pressure
distribution are computed in a closed form for each model using the unsteady
Bernoulli's theorem; (ii) The assumption of incompressibility and energy loss
(i.e., irrecoverable pressure drop) of the airflow in airways (including the
glottis) is discussed using steady compressible Bernoulli theorem as the main
tool; (iii) Inertia of an uniform waveguide is studied in terms of the
low-frequency limit of the the (acoustic) impedance transfer function. It is
observed that the inductive loading in the boundary condition sums up with the
waveguide inertance in an expected way; (iv) It is shown that an acoustic
waveguide, modelled by Webster's lossless equation with Dirichlet boundary
condition at the far end, will produce the expected mass inertance of the fluid
column as the low-frequency limit of the impedance transfer function.
