Initially, the gas density
leaving VB2 (MV2) is lower than the gas density
in the upper part of Vessel 2 (Figure 5) but later the gas density
becomes higher (mark B) than the gas in the top of Vessel 2 and the density becomes even higher than the density in the upper part of Vessel 1 (mark C).
Caption: Figure 17: The effect of gas density
on apparent permeability of shale (pore diameter = 50 nm).
Here [[rho].sub.b] is the burned gas density
in the schlieren flame sphere, [[rho].sub.u] is the unburned gas density
, and [r.sub.f] is the instantaneous schlieren flame radius in the horizontal direction.
Fabian and his colleagues showed that these ripples correspond to places in the cluster where the gas density
is slightly higher than the average.
where [rho] is the gas density
(kg/[m.sup.3]), u is the gas velocity vector (m/s), [C.sub.i] is the mass fraction of species i (--), [D.sub.i,m] is the molecular diffusivity of species i ([m.sup.2]/s), [[mu].sub.t] is the turbulent viscosity (kg/m x s), S[c.sub.t] is the turbulent Schmitt number (= 0.7 for gases), and [R.sub.i] is the net rate of production by chemical reaction (kg/[m.sup.3] x s).
The relationship between diffusion and gas density
is clearly observed in Graham's Diffusion Law, which states that diffusion velocity is inversely proportional to the square root of gas density
is the gas density
, dV is the volume element and DT/D represents the temperature substantial derivative depending on time.
If the span gas is regulated at a pressure greater than local atmospheric conditions, the gas density
will be greater, yielding a false calibration.
Various studies have been performed during the last 40 years investigating the relationships between gas density
and airflow in a selection of obstructive disorders.
On entering the surrounding cooler air of the atmosphere, the hot gas begins to cool as it rises, which progressively reduces the gas volume, with a proportional increase in the gas density