IRVF patterns, rather than RI, depended on RAP, suggesting a correlation with renal congestion. In addition, IRVF patterns strongly correlated with clinical outcomes independent of RAP and other risk factors and might provide additional information to stratify vulnerable HF patients.
The effect of diluents on the laminar burning velocity
of the premixed methane–air–diluent flames was numerically
studied using the Chemkin package. The mechanisms of dilution, thermal-diffusion,
and chemical effects of diluents on the laminar burning velocity were
analyzed quantitatively at different dilution ratios for different
diluents. Results show that the laminar burning velocity is decreased
in the order from helium, argon, nitrogen, and carbon dioxide. In
the case of N2, the thermal-diffusion and chemical effects
can be negligible and the decrease of the laminar burning velocity
is largely caused by the dilution effect. The dilution, thermal-diffusion,
and chemical effects of CO2 suppress the laminar burning
velocity, where the dilution effect plays a dominant effect among
them. For helium and argon diluents, the chemical effect can be negligible
and the thermal-diffusion effect enhances the laminar burning velocity.
Therefore, the dilution effect has a much larger suppression effect
on decreasing the laminar burning velocity to counteract the thermal-diffusion
effect of helium and argon. An empirical formula of the laminar burning
velocity that takes into account the adiabatic flame temperature and
thermal diffusivity is obtained. Good correlations between the laminar
burning velocity and mole fraction of H + OH at the position of the
maximum mole fraction of the H radical in the flame are also demonstrated.
The laminar burning velocity has the same tendency with the product
of thermal-diffusion and chemical reaction terms as a function of
the dilution ratio for different diluents. The adiabatic flame temperature
plays a dominant influence on the laminar burning velocity, and thermal
diffusivity has a secondary influence on methane–air–diluent
flames.
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