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PHENOMENOLOGICAL TWO-PHASE MULTI-ZONE COMBUSTION MODEL FOR DIRECT-INJECTION DIESEL ENGINES
K. ZHANG,M. XU,J. WEI,Y. CUI,K. DENG 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.5
This paper proposed a quasi-dimensional combustion model from a new observed two-phase penetration and combustion phenomenon in diesel spray. In the model, fuel spray was divided into two of liquid and gas phase areas. Considering the phenomenon that separation of gas and liquid phase in diesel spray occurs during spray penetration, gas and liquid area of spray are discretized respectively. Liquid phase areas play important role in fuel mass transport, however gas phase areas are the main region for fuel combustion in the model. Fuel and air mixing rate of gas phase zone is the key for the calculation of combustion rate. Validation experiments are designed by using optimal Latin hypercube design method. Comparison of calculations and experiments show that the model is able to predict diesel engine performance at different engine speeds, loads, and injection pressure and timing, and provides guidance for the design of engines.
K. B. Nie,Z. H. Zhu,K. K. Deng,Y. C. Guo,J. G. Han 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
In this work, a Mg–Zn–Ca magnesium matrix nanocomposite containing nano-sized TiC particles was firstly processed bymultidirectional forging (MDF). With increasing the forging temperature from 230 to 310 °C for 1 MDF pass or the numberof MDF passes at 270 °C, both volume fractions and average sizes of recrystallized grains increased. The average sizes ofprecipitated MgZn2phases increased with the increase in either the initial forging temperature or MDF passes, and the volumefractions gradually decreased with increasing the initial forging temperature or decreasing the MDF passes. With decreasingthe initial MDF temperature, thermal expansion mismatch strengthening slightly decreased while fine-grain strengtheningand Orowan strengthening gradually increased, resulting in a gradual increased yield strength. The elongation of the presentnanocomposite gradually increased from 8.2% after 1 MDF pass to 22.7% after 6 MDF passes, while both yield strength andultimate tensile strength did not change significantly. This could be ascribed to that although the fine-grain strengtheninggradually reduced, there was no significant change in the Orowan strengthening caused by MgZn2phases with increasingthe number of MDF passes.
Large-Pore Apertures in a Series of Metal-Organic Frameworks
Deng, H.,Grunder, S.,Cordova, K. E.,Valente, C.,Furukawa, H.,Hmadeh, M.,Gandara, F.,Whalley, A. C.,Liu, Z.,Asahina, S.,Kazumori, H.,O'Keeffe, M.,Terasaki, O.,Stoddart, J. F.,Yaghi, O. M. American Association for the Advancement of Scienc 2012 Science Vol.336 No.6084
<P>We report a strategy to expand the pore aperture of metal-organic frameworks (MOFs) into a previously unattained size regime (>32 angstroms). Specifically, the systematic expansion of a well-known MOF structure, MOF-74, from its original link of one phenylene ring (I) to two, three, four, five, six, seven, nine, and eleven (II to XI, respectively), afforded an isoreticular series of MOF-74 structures (termed IRMOF-74-I to XI) with pore apertures ranging from 14 to 98 angstroms. All members of this series have noninterpenetrating structures and exhibit robust architectures, as evidenced by their permanent porosity and high thermal stability (up to 300C). The pore apertures of an oligoethylene glycol-functionalized IRMOF-74-VII and IRMOF-74-IX are large enough for natural proteins to enter the pores.</P>
Deng S.,Lang K.,Wang J.,Tremblay A.,Matsuura T. 한국막학회 1997 멤브레인 Vol.7 No.1
Porous asymmetric membranes were prepared from polyetherimide polymer by the phase-inversion technique under different conditions. The performance of the membranes was tested for the removal of acetone vapour from nitrogen. A membrane which showed a high acetone permeability and a high selectivity was chosen and tested further for the separation of different organic vapours from nitrogen. The molecular structure of organic vapours and the selectivity were correlated. A strong correlation was also found between the chromatographic retention time of the organic vapour and the selectivity. These experimental results led to the conclusion that the sorption is the factor governing the separation of volatile organic compounds from nitrogen. A membrane was also prepared by coating the surface of a porous polyetherimide membrane with silicone rubber. The performance of membranes with and without silicone rubber coating was compared.
Membrane for the Removal of Volatile Organic Compounds from Air
Deng, S.,Lang, K.,Wang, J.,Tremblay, A.,Matsuura, T. The Membrane Society of Korea 1997 멤브레인 Vol.7 No.1
Porous asymmetric membranes were prepared from polyetherimide polymer by the phase-inversion technique under different conditions. The performance of the membranes was tested for the removal of acetone vapour from nitrogen. A membrane which showed a high acetone permeability and a high selectivity was chosen and tested further for the separation of different organic vapours from nitrogen. The molecular structure of organic vapours and the selectivity were correlated. A strong correlation was also found between the chromatographic retention time of the organic vapour and the selectivity. These experimental results led to the conclusion that the sorption is the factor governing the separation of volatile organic compounds from nitrogen. A membrane was also prepared by coating the surface of a porous polyetherimide membrane with silicone rubber. The performance of membranes with and without silicone rubber coating was compared.
Xiangtao Deng,Tianliang Fu,Zhaodong Wang,Guohuai Liu,Guodong Wang,R. D. K. Misra 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.1
We underscore here a novel approach to extend the boundaries of mechanical properties of Ti-Nb low-carbon steel via combination of ultrafast cooling and deformation during austenite-to-ferrite transformation. The proposed approach yields a refined microstructure and high density nano-sized precipitates, with consequent increase in strength. Steels subjected to ultra-fast cooling during austenite-to-ferrite transformation led to 145 MPa increase in yield strength, while the small deformation after ultra-fast cooling process led to increase in strength of 275 MPa. The ultra-fast cooling refined the ferrite and pearlite constituents and enabled uniform dispersion, while the deformation after ultra-fast cooling promoted precipitation and broke the lamellar pearlite to spherical cementite and long thin strips of FexC. The contribution of nano-sized precipitates to yield strength was estimated to be ~247.9 MPa and ~358.3 MPa for ultrafast cooling and deformation plus ultrafast cooling processes. The nano precipitates carbides were identified to be (Ti, Nb)C and had a NaCl-type crystal structure, and obeyed the Baker-Nutting orientation relationship with the ferrite matrix.