Flow boiling in small diameter channels

Many studies have been carried out on two-phase flow heat transfer in channels with hydraulic diameter bigger than 6 mm, but relatively little work has been done for small diameter channels in the meso and compact range (diameter from 0.1 to 3 mm). The use of exchangers with small channels in refrigeration units, which are very numerous besides, could bring a significant reduction of the internal volume of the exchanger, and therefore diminish the refrigerant charge of the whole refrigerating system. One can imagine the interest to widen knowledge on the flow and the heat transfer in small-diameter tubes. This paper examine the thermal behavior of refrigerants boiling in small pipes. The correlations available for in-tube evaporation heat transfer coefficient are discussed and evaluated, when possible, and new research areas of relevance than can contribute to expand the use of small-diameter channels evaporators in refrigeration units are suggested.     

热风炉系统振动管路的流体力学行为分析

管内的一些流体流动行为是引起管路系统振动的重要原因之一。针对钢铁工业高炉热风炉大型设备在运转过程中的振动问题，应用流体力学相关理论重点分析了热风炉周围管路结构的流体力学行为，指出了弯管中二次流旋涡和收缩扩散管段边界层分离旋涡流动是诱发管路振动的机理，从而会给工程设计一些有益的启发。     

平展流燃烧器内湍流输运过程的数值模拟

采用任意拉格朗日一欧拉(ALE)框架下的有限体积法对平展流湍流输运特性进行了数值模拟研究。根据平展流特征对湍流模拟的κ-ε模型进行了修正，并对计算网格的生成进行了探讨，在此基础上分析了旋流强度对平展流输运特性的影响以及两个平行平展流间的相互作用。     

循环流化床锅炉燃料颗粒度对流化燃烧的影响

循环流化床锅炉近些年来在我国得到较大发展，并不断的完善、提高。根据多年的运行实践经验，介绍了燃料的颗粒度对流化燃烧的影响并给出恰当的燃烧粒度范围和级配的比例。     

Numerical simulation of turbulent flow in helically coiled open-channels with compound cross-sections

Turbulence structure in a helically coiled open channel flow is numerically simulated using three different turbulence models-the Launder and Ying model, the Naot and Rodi model, and the nonlinear k-ε model (SY model). Simulation results were compared with observation of (i) turbulent flows in alternating point-bar type channel bends with rectangular sections, and (ii) straight open channel flows with compound cross-sections. Based on calculations of the impact of various channel curvatures on turbulence characteristics, accuracy of the three turbulence models was analyzed with observed data as a qualitative reference. It has been found out that the Launder and Ying model and the nonlinear k-εmodel are able to predict the same general trend as measured data, and the simulation of the effect of the centrifugal force on the formation of secondary currents produces a correct pattern.     

LJ船用微机测流系统的应用

LJ船用微机测流系统是能自动完成测深、测速、流量计算等一系列工作的水测验仪器。经过哈尔滨水站检验，证明该系统可以在大中河流测站使用。     

Capillary Micro-Flow Through a Fiber Bundle（Ⅰ）

The present work considered the capillary micro-flow through a fiber bundle. The resin heights in the fiber btundle as a function of time were used to detemine the experimental valises of capillary pressure and the permeability by the nonlinear regression,fitting method. The fitting curves showed a good agreement with experiments. However, these values of capillary pressure from short-time experiments were much lower than the theoretical results from the Yang-Laplace Equation. More accurate capillary presswre was predicted from the presented long-run experiment.     

NS-A型分解炉系统冷模试验结果与分析

利用NS—A型分解炉十分之一的冷态模型测试了炉、窑两路气的管道阻力特性，分解炉内的流场及物料停留时间．测试说明：1要注意调节炉、窑两路气的管道阻力．以满足需要的流量分配；2分解炉内气体流动几乎是平推流，返混小．固气停留时间比较小，要使燃料充分燃烧，必须考虑足够大的炉容；3由于炉内物料有分层现象．减小了分解炉的有效容积，因此设计分解炉要尽量避免该种现象发生．     

矿井通风网络非稳定流动数值解收敛性分析

利用分析数学的压缩映射原理，对矿井通风网络非稳定流动数学模型进行了分析，得出了数学模型数值解收敛的条件．确定了以惯性系数排序选择最小生成树的回路选择方案，为矿井通风网络非稳定流动数学模型数值解的收敛性提供了理论依据．     

酒西盆地原油溶解气中稀有气体同位素特征研究

对酒西盆地青西坳陷青西油田和南部隆起鸭儿峡油田8个原油样品进行了稀有气体测试分析,探讨了原油中氦的来源问题.青西油田4口井和鸭儿峡油田527井、702井原油3He/4He (Rc)为10-8量级,推测其原油中稀有气体是壳源放射性成因的,同时也说明与青西油田和鸭儿峡油田527井、702井有关的推覆断层的切割深度限于地壳范围内.鸭儿峡油田501井、114井原油样品3He/4He (Rc)达10-7量级,说明有少量幔源氦的混入,而与这两口井有关的推覆断层的切割深度可能已达地幔.酒西盆地大地热流值较低,平均50.9mWm-2(6),表明其大地构造活动性较我国东部盆地弱.