Linear Stability of Axial Flow in an Annular Pipe

1970 ◽  
Vol 13 (3) ◽  
pp. 829 ◽  
Author(s):  
S. Carmi
Keyword(s):  
Linear Stability ◽  
Axial Flow ◽  
Annular Pipe

The effect of sheared axial flow on the linear stability of the Z‐pinch

1996 ◽  
Vol 3 (2) ◽  
pp. 554-560 ◽  
Author(s):  
T. D. Arber ◽  
D. F. Howell
Keyword(s):  
Linear Stability ◽  
Axial Flow ◽  
Z Pinch

scholarly journals UNSTEADY HEAT TRANSFER IN AN ANNULAR PIPE. PART II: SWIRLING LAMINAR FLOW

2012 ◽  
Vol 12 (6) ◽  
Author(s):  
Kelvin Ho Choon Seng
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Dimensional Analysis ◽  
Transfer Problem ◽  
Axial Flow ◽  
Outer Diameter ◽  
Unsteady Heat Transfer ◽  
Ansys Cfx ◽  
Inner Diameter ◽  
Annular Pipe

The   heat  transfer   problem  in   magnetocaloric regenerators  during  magnetization  has  been  described  and investigated for convective heat transfer by means of axial flow in part I of this series.   This work will focus on enhancing the unsteady heat  transfer using swirling laminar flow generated using axial vanes.   The governing parameters for this  studyare,  the  D*  ratio  (Inner  diameter/Outer  diameter)  and  the swirl number, S.   The study is conducted  using  dimensional analysis and commercial CFD codes provided by ANSYS CFX. The  hydrodynamics and the  heat transfer of the  model are compared with data from similar cases found in literature and is found to be in the vicinity of good agreement.Keywords-  Annular ducts; unsteady heat transfer;  magnetic refrigeration/cooling;   swirling   laminar    flow;    dimensional analysis.

Flow Over a Sudden Expansion in an Annular Pipe: Steady Axisymmetric Flow and its Stability

2016 ◽  
Author(s):  
Behnaz Beladi ◽  
Hendrik C. Kuhlmann
Keyword(s):  
Linear Stability ◽  
Axisymmetric Flow ◽  
Three Dimensional ◽  
Normal Modes ◽  
Staggered Grid ◽  
Sudden Expansion ◽  
Algebraic Equations ◽  
Neutral Curves ◽  
Implicitly Restarted Arnoldi ◽  
Annular Pipe

The stability of the axisymmetric incompressible Newtonian flow in an annular pipe suddenly expanding radially inward is investigated. The axisymmetric steady basic flow is discretized using primitive variables and second-order finite volumes on a staggered grid. The resulting algebraic equations are solved by Newton–Raphson iteration. A three-dimensional global linear stability analysis is performed. The solutions to the linear stability problem are represented by normal modes. The generalized eigenvalue problem is solved using an implicitly restarted Arnoldi algorithm which is provided by the ARPACK library and a Cayley transformation. Stability boundaries have been computed for a range of parameters varying the outlet radius ratio. The physical instability mechanisms are studied by a an posteriori analysis of the kinetic energy transferred between the basic state and the critical mode. Neutral curves and critical modes are presented and the instability mechanisms are discussed.

Hemodynamic effects of pump flow reduction in patients with axial flow pumps during exercise training

2012 ◽  
Vol 60 (S 01) ◽  
Author(s):  
P Ganslmeier ◽  
HJ Schneider ◽  
A Keyser ◽  
M Michl ◽  
M Foltan ◽  
...  
Keyword(s):  
Exercise Training ◽  
Axial Flow ◽  
Hemodynamic Effects ◽  
Flow Reduction ◽  
Pump Flow

Axial-flow propeller pump for small rice farms and fishponds

Waterlines ◽  
1989 ◽  
Vol 8 (2) ◽  
pp. 10-12 ◽  
Author(s):  
Stickney ◽  
Salazar
Keyword(s):  
Axial Flow
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