Bubble formation in an annular granular jet dispersed by a central air round jet

An annular granular jet surrounding an air jet at its core is studied experimentally using high‐speed digital photography. The experimental results show that particle bubbles in a periodic manner are formed whether the central air is swirling or not. This flow feature is induced by the intense interaction between the central air jet and the annular granular jet, and it is important for the dispersion of particles by the air jet in the near field. The interaction between the two phases is mainly intensified by higher superficial air jet velocity and the addition of swirl to the central air jet. The bubbling frequency, bubble size, bubble shape, and bubble growth rate are investigated by analyzing a large number of images. In addition, the dispersion angle of granular jet is found to be mainly governed by the radial growth rate of the bubble. © 2012 American Institute of Chemical Engineers AIChE J, 59: 1882–1893, 2013     

富气处理和输送工艺技术

富气输送工艺不要求在矿场提取天然气凝析液成分 ,可以简化油田、凝析气田的气体处理工艺 ,节省天然气凝析液的储运费用。富气输送可采取传统压力下单相输送、高压密相输送、两相输送等 3种基本方式。对富气处理、各种富气输送方式的技术特点进行了讨论和比较 ,指出选择富气输送方式要考虑管道长度、输气量、富气组成 (气体处理工艺 )、边界压力限制等关键参数。与油气长距离混输方案相比 ,只要经过脱硫、脱水处理 ,富气的长距离输送是较稳妥的技术方案。     

稠油精细注汽配套技术研究及应用

曙光油田稠油、超稠油油藏已经大规模开发,为了提高该类油藏的最终采收率,提出并实施了稠油精细注汽配套技术。该配套技术于2006年在曙光油田累计实施应用了111井次,措施成功率88.3%,平均单井增产原油317.1m~3,取得了较好的应用效果。     

Statistical micromechanical method for dynamic kinetic binary interaction among moderate dense gene-regulating bio-molecules

A statistical thermodynamical approach has been introduced to calculate shear viscosity and thermal flux for interactions among the gene-regulating biomolecular protein particles that operate in moderate density rigid-sphere fluids. Starting from the modified Boltzmann equation with the help of linear perturbation theory, the coefficients of distribution function were determined. On the basis of transport theory, we introduced computational forms of diffusion constant, mass flux, shear viscosity, and thermal flux. We examined the influences of changes in mass, diameter, and magnitude of the pair correlation function. The present method will be available to evaluate the local physical reaction properties of the gene-regulating particles.This work was presented, in part, at the 8th International Symposium on Artificial Life and Robotics, Oita, Japan, January 24–26, 2003     

The Thermal Conductivity, Thermal Diffusivity, and Heat Capacity of Gaseous Argon

This paper presents new absolute measurements for the thermal conductivity and thermal diffusivity of gaseous argon obtained with a transient hot-wire instrument. Six isotherms were measured in the supercritical dense gas at temperatures between 296 and 423 K and pressures up to 61 MPa. A new analysis for the influence of temperature-dependent properties and residual bridge unbalance is used to obtain the thermal conductivity with an uncertainty of less than 1% and the thermal diffusivity with an uncertainty of less than 4%. Isobaric heat capacity results were derived from measured values of thermal conductivity and thermal diffusivity using a density calculated from an equation of state. The heat capacities presented here have a nominal uncertainty of 4% and demonstrate that this property can be obtained successfully with the transient hot wire technique over a wide range of fluid states. The technique will be useful when applied to fluids which lack specific heat data.     

水平管密相气力输送的附加摩擦阻力系数

本文沿用Barth稀相气力输送理论,在试验基础上,得到在水平管内作密相气力输送时,砂粒在各种工艺参数下的附加摩擦阻力系数的经验关联式。结果发现,附加摩擦阻力系数λz随弗劳德数Fr的增加而减小;在λz与固气混合比μ的关系曲线上,存在一个使λz取最大值的临界固气混合比μm;当μ<μm,λz随μ的增加而增加;当μ>μM,λz随μ的增加而减小。μm随流动型式的变化而有所不同。经验关联式中,Fr的指数大于μ的3倍。该研究为进一步研究密相气力输送奠定了基础。     

高温高压下Fe^26物态方程数值计算

本文在球元胞、中心力场、相对论Fermi统计近似下,用平均原子模型计算了任意温度和密度下热稠密物质Fe~(26)的状态方程。     

二分图的无关分解及其在覆盖问题中的应用

为了大容量存贮器制造过程中因缺陷而造成成品率低的问题，或并行阵列中的容错重组问题，一般采用冗余修复的方法，该问题可以归结为对二分图的覆盖，且该问题属于ＮＰ完全问题。     

近年选煤技术综合评述

对1998年以来选煤技术的发展进行了评述。指出选煤技术的发展状况主要表现为:原煤入选比例继续提高,选煤厂规模及选煤装备趋向大型化;重介质选煤比例迅速上升,重介质旋流器选煤技术发展迅速;传统选煤方法及设备的分选效果得到提高;研究开发细粒煤的新选煤方法取得丰硕成果;模块化成为选煤厂建设的新模式;选煤生产过程自动控制和全厂自动化水平迈上新台阶。