Project abstract for group puichen

Numerical Study of Particle Filtration

These researchers are using MSI resources for five projects. In the first, they are developing a model for the design of pleated filters with particle loading with the aid of numerical simulation. They are calculating particle deposition on filter media from the interaction of gas flow field and particle trajectory. The simulation will help to understand the performance of pleated filters with dust cake buildup and lead to new design criteria for this condition.

The second project involves modeling and designing of a gasoline particulate filter. Gasoline particulate filter (GPF) plays an important role in controlling fine particle emission from gasoline engines, especially for the newly-developed gasoline direct injection engine used in light-duty vehicles. The backpressure and filtration performance of GPF will be modeled for both clean and loaded conditions, and the results will be used to guide the design of better GPF for vehicle applications. 

The third project is modeling of the charging efficiency of nanoparticle agglomerates. Charging efficiency of aerosols plays a significant role in particle precipitation, filtration, electrical measurement and many other applications. The charging study of agglomerates which have complicated structures is challenging. The charging efficiency is dependent on the particle properties such as the electrical capacitance, surface area, and possibly other parameters. Numerical calculation of the electrical capacitance may be carried out by a variational method which seeks to minimize the electrical potential energy. Difficulties in the calculation arise in the particle structure, polydispersity of the primary particles, and necking between the primary particles. After the electrical capacitance is computed, it can be combined with other parameters to give the charging efficiency

In the fourth project, the researchers are modeling solar chimneys for air pollution control. With the greenhouse effect, the solar chimneys are able to absorb and filtrate polluted air. The objective of this study is to simulate flow fields and operating performance in solar chimneys with different geometries and dimensions. A final solar chimney will be determined based on the numerical results, and built in the laboratory for experimental use.

The fifth project is a numerical assessment of the effect of upstream flow non-uniformity to particle deposition pattern and filter performance under particle loading. The project aims to understand the flow field under non-uniform flow conditions and the particle transportation properties under it. This work will be important for filtration system and filter design in practical application. 

A bibliography of this group’s publications acknowledging MSI is attached.