对流

Some key problems whether the height and diameter of the reactor chamber can be further increased,how to optimize the temperature and concentration fields above the susceptor,etc.are explored.

模拟结果发现：(1)通过对反应器形状进行优化，使进口处流道趋向于流线的形状，可以大大地削弱甚至消除由流道扩张引起的涡旋；(2)在影响对流涡旋的几何参数中，反应腔高度起主要作用，而反应腔直径影响较小。

TG turbine ventilators can run by the natural wind or the temperative difference between indoor and outdoor without the electricity power.They can exhaust the hot and the harmful air indoor and improve the environment indoor. They belong to the environmental protectings products. It can lower the indoor'stemperature, the good working environment can improve the workers' working efficiency.

通冠无动力风机无需电力，通过自然风或室内外温差，轻易驱动涡轮叶片，节能环保，实现无成本运转，并不间断地使空气加速对流，排除室内的热废气体，改善室内的空气环境，降低室内温度，带动员工的工作积极性，提高公司的整体工作效益。

In 1973 the Institute of Chemical Metallurgy was engaged to carry out research on fluidizcd roasting of titaniferous iron ore containing vanadium, with the special objective of utilizing the local resources of natural gas and hydraulic electric power, by reduction of the ore with a hydrogen-rich gas followed by melting of the reduced cinder in an electric furnace in order to separate the iron from a slag rich in vanadium and titanium.

化工冶金研究所于1973年接受了&流态化焙烧还原钒钛铁矿&的任务，要求结合当地资源，用天然气还原铁精矿，用水力发电熔化焙砂，再从熔渣中提取钒和钛。我们对流态化还原的若干方面开展了试验研究，包括铁精矿还原反应数据的获得和有关分析，以及可供应用的两种流态化反应器的工程研究。第一种是气控式多层流态化床，第二种是快速流态化反应器。此外，对于流态化还原中的失流以及熔砂的渣～铁分离和从熔渣中提取钒钛，也进行了试验研究。

Its generated mechanism is that poten-tial instability is touched off by the convergent and thermodynamics near theground in the favourable weather controlled by trough of high altitude.Thatmakes effective potential energy release greatly, forming strong convection.Meanwhile, intensive storms with convection are occurred because of the plentyof moisture flowing into the basin and favourable topograph...

吐鲁番盆地的大降水具有降水时间短、强度大、范围小，雨量集中等特点，它的发生机制是在高空低槽控制的有利天气形势下，地面动力辐合作用和热力作用触发了大气中的潜在不稳定结构，使得大气有效位能大量释放，形成强烈的对流；同时，有充沛的水汽输入盆地，在有利地形条件下，产生强对流暴雨。

The analytical calculation of the solar collecting performance of Trombe wall which use one-dimensional thermal network have been presented.

本文借助计算程序采用一维热网络模型对特朗贝墙体的集热性能进行了分析计算，计算中考虑了被绝大多数同类研究忽略的空气间层内玻璃盖板侧的自然对流换热，以及玻璃盖板与吸热面的辐射换热。

And has brilliant prospect due to its simple structure, good economy and energy saving performance.Based on the full scale passive solar experimental building in DUT, in which the researcher carried experiment as the main method and the CFD simulation as the minor method, the research focuses on passive ventilation formed by the Trombe wall. This paper analyzed the indoor thermo and humidity performance of passive solar building with Trombe wall, and the different ventilation patterns in different seasons, revealing the role of passive ventilation in improving indoor environment. Also the paper researched the characteristics of passive ventilation on air flow and heat transfer mechanicsms, and put forward the best control and adjusting method. Meanwhile the paper gained an empiric formula in use of calculating the natural convection heat transfer and found the key factor of influing the indoor environment.

本研究以被动式采暖降温技术为依托，采用实验和CFD数值模拟的研究方法，重点研究了新型被动式太阳房在不同气候条件下室内热湿环境的动态变化规律，分析不同季节下被动式太阳房内不同的被动式通风模式以及不同被动式通风模式在改进室内热湿环境方面的作用：揭示了特定被动式通风流动和换热特性、控制与预测方法；得到了计算被动式通风对流换热量的经验公式以及影响室内热湿环境的关键因素；了解了含有特朗贝墙体被动式太阳房的自身优势和仍待改进的方面；在实体大被动式太阳房实验技术方面积累了一定的经验。

In this paper, the heat transfer of a two-dimensional steady-state uncompressible fluid flow across the elliptic tube s was studied .

本文分析了二维稳态不可压缩流体横掠椭圆管束的强迫对流换热问题。

In order to understand the mechanism of pollution process around insulator under the wet condition better,based on the principle of computational fluid dynamics CFD, the numerical model,which was used to analyze three-dimensional two-phase uncompressible turbulent flow field around composite insulator in wet weather and convection-diffusion of dust particles,was established.Then,the dynamic simulation of the general approach,which was used to analyze solid dust particles' wet deposition process around composite insulator with application of CFD software-Fluent,was proposed.

为深入了解绝缘子外部在湿润条件下的积污机理，基于计算流体力学原理CFD建立了求解湿润气象条件下复合绝缘子外部三维两相粘性不可压缩湍流流场的基本控制方程组和尘埃颗粒对流扩散的基本方程，提出应用CFD软件Fluent可对复合绝缘子表面固体尘埃颗粒湿沉降过程进行动态模拟的一般方法。

The present experiment demonstrated that the unhomogeneity of surface tension induced by gradient magnetic field near the surface of liquid could lead to surface deformation, the quantity and direction of deformation are directly related to the distribution of gradient filed, and a new way to the research of the kinetics of Buoyant-Thermcapillary Convection is proposed.

得到了结论：液体表面附近处的梯度磁场将引起表面张力的不均匀而使其发生变形，变形量及方向与磁场强度和梯度的空间分布有直接关系，为浮力-热毛细对流的相关研究提供一种新的途径。

In the following chapters, a set of three-dimensional mathematical models involving the heat transfer of the coolant turbulent flow and heat conduction coupling, which is applicable in engineering, was established according to currency N-S control equation, the SIMPLER algorithm in an unstaggered grid system, SMART scheme and k- e turbulence model are used in the flowfield ; The method of whole-field dispersed and solved are appled in the temperature field.

流场计算中，采用同位网格上的SIMPLER算法和低雷诺数κ-ε湍流模型，对流扩散项采用SMART格式离散；温度场计算中采用整场离散，整场求解。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。