what is RNS equation ?don't copied google
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Answer:
Reactive nitrogen species (RNS) are a family of antimicrobial molecules derived from nitric oxide (•NO) and superoxide (O2•−) produced via the enzymatic activity of inducible nitric oxide synthase 2 (NOS2) and NADPH oxidase respectively. NOS2 is expressed primarily in macrophages after induction by cytokines and microbial products, notably interferon-gamma (IFN-γ) and lipopolysaccharide (LPS).[2]
In this paper, a steady laminar axisymmetrical flow in a straight constricted pipe is considered. The RNS/Prandtl equations are presented as an asymptotic limit of the Navier–Stokes equations. This set of equations is shown to include at first order several asymptotic descriptions of the full Navier–Stokes equations: the Blasius regime, interacting boundary layer theory, triple deck theory, the Poiseuille regime and double deck theory. These theories are all characterised by a constant pressure in each cross section. Thus, these equations are able to describe the transitions between flow regions that correspond to different classical asymptotic descriptions or regimes that are usually done with the full Navier–Stokes equations. One potential application is to predict the order of magnitude of the wall shear stress in a constricted pipe. This prediction will be compared with Navier–Stokes computations for a case of a severe constriction.