Asymptotic solutions for laminar flow based on blood circulation through a uniformlyporous channel with retractable walls and an applied transverse magnetic field

TY - JOUR

T1 - Asymptotic solutions for laminar flow based on blood circulation through a uniformlyporous channel with retractable walls and an applied transverse magnetic field

AU - Li, Lin

AU - Lin, Ping

AU - Zhang, Hong

AU - Zheng, Liancun

AU - Si, Xinhui

N1 - This work is partially supported by the National Natural Science Foundation of China (Nos. 91430106, 11302024), Fundamental Research Funds for the Central Universities (Nos: 06108038, FRF-BR-13-023, FRF-TP-15-036A3), and the foundation of the China Scholarship Council in 2014 (File No. 154201406465041).

PY - 2017/2/15

Y1 - 2017/2/15

N2 - This paper is concerned with asymptotic solutions of a nonlinear boundary value problem (BVP), which arises in a study of laminar flow in a uniformly porous channel with retractable walls and an applied transverse magnetic field. For different ranges of the control parameters (i.e. α,Re and M) arising in the BVP, four cases are considered using different singular perturbation methods. For the first case, unlike those in the existing literature, we make use of the Lighthill method and successfully construct an asymptotic solution with high-order derivatives at the center of the channel. For the second case, under large suction we consider M2 = O(1) and M2 = O(Re), respectively, which will further extend the applying range of asymptotic solutions. In other cases, asymptotic solutions with a boundary layer are successfully constructed. In addition, numerical solutions presented for each case agree well with asymptotic solutions, which illustrates that the asymptotic solutions constructed in this paper are more reliable. Finally, the influences of some parameters on flow field are discussed to develop a better understanding of the flow problem.

AB - This paper is concerned with asymptotic solutions of a nonlinear boundary value problem (BVP), which arises in a study of laminar flow in a uniformly porous channel with retractable walls and an applied transverse magnetic field. For different ranges of the control parameters (i.e. α,Re and M) arising in the BVP, four cases are considered using different singular perturbation methods. For the first case, unlike those in the existing literature, we make use of the Lighthill method and successfully construct an asymptotic solution with high-order derivatives at the center of the channel. For the second case, under large suction we consider M2 = O(1) and M2 = O(Re), respectively, which will further extend the applying range of asymptotic solutions. In other cases, asymptotic solutions with a boundary layer are successfully constructed. In addition, numerical solutions presented for each case agree well with asymptotic solutions, which illustrates that the asymptotic solutions constructed in this paper are more reliable. Finally, the influences of some parameters on flow field are discussed to develop a better understanding of the flow problem.

KW - Bvp4c

KW - Laminar flow

KW - Magnetic field

KW - Porous and retractable channel

KW - Singular perturbation method

UR - https://www.scopus.com/pages/publications/85007275684

U2 - 10.1016/j.powtec.2016.12.033

DO - 10.1016/j.powtec.2016.12.033

M3 - Article

AN - SCOPUS:85007275684

SN - 0032-5910

VL - 308

SP - 398

EP - 409

JO - Powder Technology

JF - Powder Technology

ER -