速度分布

Used CFD software FLUENT, the three dimensional simulation to piston windorganization at the mine transportation drift were studied. The speeds, static pressuredistribution map at various characteristics sub-plane under different condition were obtained.The entire flow field was divided to different sub-area. The speeds, static pressure changingtendency at the typical position were analyzed. Mechanics origin of the piston wind wasdiscussed.

7采用计算流体力学软件FLUENT对矿井运输巷道内活塞风的风流组织进行了三维数值模拟，得出了不同状态下各特征子平面上的速度、静压分布，并对巷道内空气流域进行了分区，分析了典型位置上的速度、静压变化趋势，探讨了活塞风形成的力学原因。

Therefore liquid CO_2 avoids gas-solid multiphase flow, and supplies continuous low temperature gas for cryoprobe. Experimental results show that the 2-dimension temperature distribution for the first time, it includes:(1) The cooling velocity and freezing zone increases along the flux up at certain size of the cryoprobe in the same biological tissue.(2) As the diameter of cryoprobe increases, the temperature will descend faster, freezing zone will be broader obviously, and ice ball become larger. Until it arrives heat balance, the temperature keeps invariability.(3) Single freezing-thaw results in biggish mechanical injury already for loosen tissue such as pork liver; Successive freeze-thaw circle could quicken freezing and thaw velocity for compact tissue, and it has proved the more mechanical injury of successive freeze-thaw circle than the single freezing-thaw treatment.

文中首次对生物组织进行了二维温度场分布实验研究，得出：(1)当刀头大小一定，对同一组织冷冻时，流量越大，降温速度越快，降温影响区域越大；(2)随着冷刀直径的增加，降温速度随着增加；温度影响区域明显增大；冰球直径也随着增大，热量平衡后温度几乎不随时间变化；(3)对于结构疏松组织比如猪肺脏，单次冻融对组织已造成较大的机械破损；对于结构较致密组织，多次反复冻融可以使降温和复温速率增加，单次冻融的热应力造成的机械破损较小，多次冻融后造成的机械破损比单次冻融所造成的机械破损大；(4)直喷式刀头比导热式节能约15％。

Based on the Darcys law, the theoretical model of permeability measurement was established. And the influence of different testing methods and major process parameters such as fabric structure, fiber volume fraction, injection pressure, flow rate and resin viscosity on preform permeability were investigated in details. It was found that the permeability of fibrous reinforcement mainly lied on the preform architecture.

文中首先根据达西定律建立了渗透率测量的理论模型，深入研究了不同的测试方法及主要工艺参数(纤维织物织构、纤维体积含量、充模压力、流动速度、树脂粘度)对渗透特性的影响规律，发现多孔介质增强材料的渗透率主要取决于纤维织物的结构形式，预成型体孔隙分布及其体积分数、压实性对渗透率有较大的影响，提高充模压力和流动速度可以缩短充模时间，在一定程度上可以提高渗透率。

On the other hand, the S wave velocity structure shows an EW variation, this distribution feature corresponds to the distribution of epicenters and volcanoes, and the strike of faults.

另外，S波速度结构还反映出这一构造格局呈南北向的空间展布，并且与该区地震震源分布、断裂走向、火山分布有很好的对应关系。

This paper mainly focus on the heat transfer and flow in float glass tank s,and the effect of doghouse width on the velocity,temperature field and refining quality.

研究了浮法玻璃熔窑内传热与流动以及投料池宽度变化对熔窑内流场、温度场和玻璃熔制质量的影响，采用了 SIMPL EC算法计算了温度和速度场，计算了不同投料池宽度下的熔制因子分布和滞留时间微分分布。

To achieve the same final cooling temperature at constant cool-down different laminar cooling patterns play important roles in the cool-down rate along plate gauge and temperature distribution.

同等冷却速度下，为了达到相同的终冷温度，不同的层流冷却方式对中厚板厚度方向的冷却速度和温度分布产生重要的影响。

The results indicated that the axial velocity distribution of the mixture was a parabola-like curve along the radius and the change of the velocity was larger in the region within 0%～25% of the pipe width (about 15 mm) from the pipe walls, but smaller in other positions. The vortex changed greatly in the region within 0%～16.7% of the pipe width (about 10 mm) from the pipe walls and then decreased gradually to zero at the pipe center.

结果表明，混合颗粒的轴向速度呈类似抛物线状分布，在靠近管壁约0%～25%管宽范围内，即在试验装置距管壁约15 mm范围内，轴向速度变化较大，其他位置处变化较小；涡量在靠近管壁约0%～16.7%管宽范围内，即在试验装置距管壁约10 mm范围之内变化明显，从距离管壁10 mm到竖直管中心涡量逐渐减小到接近为零。

The flowfield numerical simulation of the axisymmetric jet emanating fromthe organ-pipe nozzle is made with the turbulence κ—ε two equations model, providing the basis for improving its cleaning ability.

采用湍流κ-ε二方程模型对风琴管式喷嘴内外流场进行数值模拟，弄清其流场的流动特性（轴向速度、径向速度的分布规律和衰减规律），为提高清除岩屑效率提供依据。

Firstly, saltating sand grains in various height layers mostly rotate clockwise; the rate of counterclockwise rotation changes from 16.7 to 33.3% for three different friction wind speed (u*= 0.67, 0.83, and 0.87 m/s). However, their mean rotational speeds were not significantly different, irrespective of whether the grains rotated clockwise or counterclockwise. The mean counterclockwise rotational speeds of sand grains for friction wind speed u*= 0.67, 0.83, and 0.87 m/s were 427, 519, and 604 rev/s, versus 429, 522, and 609 rev/s, respectively, in the clockwise direction.

首先，风沙流中各高度层内跃移沙粒旋转均以顺时针方向为主，逆时针方向旋转的沙粒数仅占总数的16.7-29.5%，但是无论逆时针还是顺时针旋转的沙粒，它们的平均旋转速度几乎没有差别(如u*＝0.67 m/s时，分别为427 rev/s和429 rev/s；u*＝0.83 m/s，分别为519 rev/s和522 rev/s；u*＝0.87 m/s，分别为604 rev/s和609 rev/s)；不同摩阻风速条件下各高度层内沙粒的旋转速度均服从Lorentzian分布。

Therefore, by comparing particle distribution of the spraying under different water pressure, and the nozzle's outlet velocity simulation get by Ansys, which is a software for mechanical simulation, a proposal of the application of 1.5mm nozzle, 8Mpa water pressure on the spot was put forward.

在比较多种光学测粒仪的基础上，选择Winner313系统测量不同孔径喷嘴在不同供水压力下喷雾雾场的粒径分布。通过分析比较喷嘴在不同压力下喷雾雾场的粒径分布和Ansys模拟得到的喷嘴内部及出水口速度场，建议现场应用1.5mm喷嘴、供水压力为8MPa进行喷雾。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。