Flow Development of a Gas-solid Suspension in a Microgravity Couette Apparatus
نویسندگان
چکیده
We analyze the development of a gas-solid flow in an axisymmetric shear cell without gravitational accelerations. A gas pressure gradient imposed on the cell induces a relative motion between the two phases, while the differential rotation of the cell boundaries allows the independent control of the solids agitation. We model variations of the cross-sectional averaged solid volume fraction, mean velocity and fluctuation energy along the cell using a technique similar to the integral treatment of a boundary layer. The theory finds a condition for which fully-developed flows can be achieved in regions of the cell.
منابع مشابه
Using Burnett Equations to Derive an Analytical Solution to Pressure-Driven Gas Flow and Heat Transfer in Micro-Couette Flow
The aim of the present study is deriving an analytical solution to incompressible thermal flow in a micro-Couette geometry in the presence of a pressure gradient using Burnett equations with first- and second-order slip boundary conditions. The lower plate of the micro-Couette structure is stationary, whereas the upper plate moves at a constant velocity. Non-dimensional axial velocity and tempe...
متن کاملCollisional Granular Flows with and without Gas Interactions in Microgravity
We illustrate the convenience of a long-lasting microgravity environment to study flows of granular materials with and without gas interaction. We consider collisional granular flows of nearly elastic identical spheres in an axisymmetric Couette channel featuring two cylindrical moving bumpy boundaries and two flat walls. We review governing equations for these flows, illustrate their solutions...
متن کاملHydrodynamic stability of a suspension in cylindrical Couette flow
A linear stability analysis was carried out for a dilute suspension of rigid spherical particles in cylindrical Couette flow. The perturbation equations for both the continuous fluid phase and the discontinuous particle phase were decomposed into normal modes resulting in an eigenvalue problem that was solved numerically. At a given radius ratio, the theoretical critical Taylor number at which ...
متن کاملExperimental Investigation of Natural Gas Components During Gas Hydrate Formation in Presence or Absence of the L-Tyrosine as a Kinetic Inhibitor in a Flow Mini-loop Apparatus
Hydrates are crystalline compounds similar to ice, with guest molecules like methane and ethane trapped inside cavities or cages formed by the hydrogen bounded framework of water molecules. These solid compounds give rise to problems in the natural gas oil industry because they can plug pipelines and process equipments. Low dosage hydrate inhibitors are a recently developed hydrate control tech...
متن کاملHydromagnetic Couette flow of class-II and heat transfer through a porous medium in a rotating system with Hall effects
Steady hydromagnetic Couette flow of class-II of a viscous, incompressible and electrically conducting fluid through a porous medium in a rotating system taking Hall current into account is investigated. Heat transfer characteristics of the fluid flow are considered taking viscous and Joule dissipations into account. It is noticed that there exists flow separation at the moving plate in the sec...
متن کامل