2D Navier-Stokes stability computations for solid rocket motors - Rotational, combustion and two-phase flow effects

1997 ◽  
Author(s):  
Eric Daniel ◽  
Nicolas Lupoglazoff ◽  
Francois Vuillot ◽  
Thierry Basset ◽  
Joel Dupays ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Navier Stokes ◽  
Phase Flow ◽  
Two Phase ◽  
Solid Rocket Motors ◽  
Rocket Motors ◽  
Flow Effects ◽  
Solid Rocket

Effects of particle size on two-phase flow loss in aluminized solid rocket motors

2019 ◽  
Vol 159 ◽  
pp. 33-40 ◽  
Author(s):  
Ziyan Li ◽  
Ningfei Wang ◽  
Baolu Shi ◽  
Shipeng Li ◽  
Rongjie Yang
Keyword(s):  
Particle Size ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Solid Rocket Motors ◽  
Rocket Motors ◽  
Flow Loss ◽  
Solid Rocket

On shock waves in two-phase flow: effects of inter-phase heat transfer and slip

1999 ◽  
Vol 45 (11) ◽  
pp. 687-696
Author(s):  
W.E. Lear ◽  
C.R. Jackson ◽  
S.A. Sherif
Keyword(s):  
Heat Transfer ◽  
Shock Waves ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Effects

Two-Phase Flow Considerations in PEMFC Design and Operation

2008 ◽  
Author(s):  
Jon P. Owejan ◽  
Jeffrey J. Gagliardo ◽  
Jacqueline M. Sergi ◽  
Thomas A. Trabold
Keyword(s):  
Liquid Water ◽  
Proton Exchange Membrane ◽  
Two Phase Flow ◽  
Bipolar Plate ◽  
Gas Diffusion ◽  
Proton Exchange ◽  
Phase Flow ◽  
Two Phase ◽  
Flowing Hydrogen ◽  
Flow Effects

A proton exchange membrane fuel cell (PEMFC) must maintain a balance between the hydration level required for efficient proton transfer and excess liquid water that can impede the flow of gases to the electrodes where the reactions take place. Therefore, it is critically important to understand the two-phase flow of liquid water combined with either the co-flowing hydrogen (anode) or air (cathode) streams. In this paper, we describe the design of an in-situ test apparatus that enables investigation of two-phase channel flow within PEMFCs, including the flow of water from the porous gas diffusion layer (GDL) into the channel gas flows; the flow of water within the bipolar plate channels themselves; and the dynamics of flow through multiple channels connected to common manifolds which maintain a uniform pressure differential across all possible flow paths. These two-phase flow effects have been studied at relatively low operating temperatures under steady-state conditions and during transient air purging sequences.

On convergent schemes for two-phase flow of dilute polymeric solutions

2018 ◽  
Vol 52 (6) ◽  
pp. 2357-2408 ◽  
Author(s):  
Stefan Metzger
Keyword(s):  
Finite Element ◽  
Two Phase Flow ◽  
Stokes Equations ◽  
Navier Stokes ◽  
Phase Flow ◽  
Two Phase ◽  
Extra Stress Tensor ◽  
Spring Force ◽  
Polymeric Solutions ◽  
Fokker Planck

We construct a Galerkin finite element method for the numerical approximation of weak solutions to a recent micro-macro bead-spring model for two-phase flow of dilute polymeric solutions derived by methods from nonequilibrium thermodynamics ([Grün, Metzger, M3AS 26 (2016) 823–866]). The model consists of Cahn-Hilliard type equations describing the evolution of the fluids and the unsteady incompressible Navier-Stokes equations in a bounded domain in two or three spatial dimensions for the velocity and the pressure of the fluids with an elastic extra-stress tensor on the right-hand side in the momentum equation which originates from the presence of dissolved polymer chains. The polymers are modeled by dumbbells subjected to a finitely extensible, nonlinear elastic (FENE) spring-force potential. Their density and orientation are described by a Fokker-Planck type parabolic equation with a center-of-mass diffusion term. We perform a rigorous passage to the limit as the spatial and temporal discretization parameters simultaneously tend to zero, and show that a subsequence of these finite element approximations converges towards a weak solution of the coupled Cahn-Hilliard-Navier-Stokes-Fokker-Planck system. To underline the practicality of the presented scheme, we provide simulations of oscillating dilute polymeric droplets and compare their oscillatory behaviour to the one of Newtonian droplets.

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