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New type of spherical pore Al alloy foam with low porosity and high strength

Science China Chemistry 2004年第5期47卷 407-413页

作者： ZOU Yi HE Deping JIANG Jiaqiao Department of Material Science and Engineering Southeast University Nanjing 210096 China Department of Material Science and Engineering Southeast University Nanjing 210096 China Department of Material Science and Engineering Southeast University Nanjing 210096 China

A computer system for displacement sensor is developed to obtain the real-time curve of the liquid porosity of molten Al alloy foam. The relationship between the curve ofP I-t and the change of the shape of the cells (spherical, similar spherical and polygonal) in the foaming process is analyzed. The changes of cell diameter and cell wall thickness are studied. And the the controlling methods of a new Al alloy foam with spherical pores, low porosity and high strength are developed on this basis. Also, the stress-strain curve during compressive deformation and energy absorption characteristics are investigated and compared with polygonal pore Al alloy foam with high porosity. Keywords spherical pore - low porosity - high strength - interface shifting - Al alloy foam These authors contributed equally to this work.

关键词： spherical pore, low porosity, high strength, interface shifting, Al alloy foam.

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Characterization of Microbial Transport in Cylindrical pores

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Chinese Journal of Chemical Engineering 2006年第6X期14卷 819-824页

作者：刚洪泽刘梅堂牟伯中 Department of Chemistry East China University of Science and Technology Shanghai 200237 China

The mathematical model to characterize the transport of microorganisms in a finite-length cylindrical pore with the inside surface rich in microbial nutrients is developed, and the transport behavior of microorganisms in such a pore is discussed. Incorporated with key parameters such as microbial chemotaxis, diffusion, in-situ propagation and water flooding, this model is focused on the concentration profile of microorganisms in both radial and axial directions in the cylindrical pore during microbial transport under these parameters. Prediction by simulation based on the model shows that higher concentration of microorganism at and near the pore inside surface occurred during water flooding, and the radial concentration gradient in the cylindrical pore was consequently formed mainly due to microbial chemotaxis. Prediction also provides better understanding on the transport mechanism of microorganism in cylindrical pores, which is believed to be significant in the process of microbial enhanced oil recovery.

关键词： microorganism, transport, cylindrical pore, chemotaxis

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