Computer modelling for the deposition of spherical particulates in a hollow cylinder medium
One of the main objectives in our task is to develop a way to make uniform low-density-materials. The current method being studied is by means of deep filtration. We are trying to deposit sub-micron particulates uniformly in a porous medium. The behavior of depositing particulates inside a porous medium is a very complicated phenomenon. It varies with the structure of the porous medium, the fluid dynamics, the particulate properties, etc. All these factors will influence the balance between the mass transfer and the deposition kinetics in the system. It is a desire to develop some computer models that will guide us in the right direction for the development of various systems. This report is devoted to the most basic and the simplest model developed for this purpose. The model presented deals with the deposition behavior of uniform spherical particulates inside a matrix composed of uniform hollow cylinders. We have limited ourselves to the case of 100% sticking coefficient (or capture probability). This specific condition will make the whole system become mainly mass transfer controlled. The basic mass transfer calculations are based on the theoretical solution for the diffusion of aerosol in a laminar pipe flow. The results of the model suggest that it is an intrinsic phenomenon to have much heavier deposition at the upstream entrance area. Therefore, in order to accomplish a uniform deposition, special modifications may be required. A listing of the computer code is included in appendices.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5473290
- Report Number(s):
- UCID-20816; ON: DE86013922
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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CYLINDERS
DENSITY
POROSITY
F CODES
FLUID MECHANICS
PARTICULATES
DEPOSITION
COMPUTERIZED SIMULATION
FILTRATION
MASS TRANSFER
MATHEMATICAL MODELS
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COMPUTER CODES
MATERIALS
MECHANICS
PARTICLES
PHYSICAL PROPERTIES
SEPARATION PROCESSES
SIMULATION
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640410 - Fluid Physics- General Fluid Dynamics
990200 - Mathematics & Computers