TY - JOUR

T1 - Burgers equation with no-flux boundary conditions and its application for complete fluid separation

AU - Watanabe, Shinya

AU - Matsumoto, Sohei

AU - Higurashi, Tomohiro

AU - Ono, Naoki

N1 - Funding Information:
The work was partially supported by JSPS Grant-in-Aid for Scientific Research(C) #15K05841 .

PY - 2016/9/15

Y1 - 2016/9/15

N2 - Burgers equation in a one-dimensional bounded domain with no-flux boundary conditions at both ends is proven to be exactly solvable. Cole-Hopf transformation converts not only the governing equation to the heat equation with an extra damping but also the nonlinear mixed boundary conditions to Dirichlet boundary conditions. The average of the solution v is conserved. Consequently, from an arbitrary initial condition, solutions converge to the equilibrium solution which is unique for the given v. The problem arises naturally as a continuum limit of a network of certain micro-devices. Each micro-device imperfectly separates a target fluid component from a mixture of more than one component, and its input-output concentration relationships are modeled by a pair of quadratic maps. The solvability of the initial boundary value problem is used to demonstrate that such a network acts as an ideal macro-separator, separating out the target component almost completely. Another network is also proposed which leads to a modified Burgers equation with a nonlinear diffusion coefficient.

AB - Burgers equation in a one-dimensional bounded domain with no-flux boundary conditions at both ends is proven to be exactly solvable. Cole-Hopf transformation converts not only the governing equation to the heat equation with an extra damping but also the nonlinear mixed boundary conditions to Dirichlet boundary conditions. The average of the solution v is conserved. Consequently, from an arbitrary initial condition, solutions converge to the equilibrium solution which is unique for the given v. The problem arises naturally as a continuum limit of a network of certain micro-devices. Each micro-device imperfectly separates a target fluid component from a mixture of more than one component, and its input-output concentration relationships are modeled by a pair of quadratic maps. The solvability of the initial boundary value problem is used to demonstrate that such a network acts as an ideal macro-separator, separating out the target component almost completely. Another network is also proposed which leads to a modified Burgers equation with a nonlinear diffusion coefficient.

KW - Coupled quadratic map

KW - Exactly solvable model

KW - Fluid separation

KW - No-flux boundary condition

KW - Shock collision

KW - Two-dimensional network

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U2 - 10.1016/j.physd.2016.05.004

DO - 10.1016/j.physd.2016.05.004

M3 - Article

AN - SCOPUS:84974539392

SN - 0167-2789

VL - 331

SP - 1

EP - 12

JO - Physica D: Nonlinear Phenomena

JF - Physica D: Nonlinear Phenomena

ER -