查询词典 heat flow

The effects of the flow and the geometric parameters on the flow and heat transfer characteristic are analyzed extensively.

总结了主要的结构参数和状态参数对流动与传热特性的影响规律。

ABSTRACT Flow pattern is of great importance in scientific research and engineering practice for two-phase flow and its heat transfer.

流型在汽液两相流及其传热的科研和工程实际中都是非常重要的。

The results show that the flow distribution in plate-fin heat exchangers can be effectively improved by changing the header configuration. It is also found that the effect of header configuration on the flow maldistribution in crosswise direction at the outlet area is greater than that in lengthwise direction.

实验结果表明，通过改变封头的结构，可以有效地改善换热器内部的物流分配；封头结构对物流分配不均匀性的影响主要表现在出口截面的横向方向上，而对纵向方向上的物流分配不均匀性的影响较小。

In this paper, the study of header configuration on fluid flow maldistribution was done and the influencing rule was found for the optimum of configuration in order to make the fluid flow more uniform in heat exchangers.

在本文中对封头结构进行了研究，得到上述因素对换热器内部物流分配不均匀性影响的规律，进而对其结构型式进行优化设计，最后达到改善换热器内部物流分配的目的。

The experimental results show that the time-average data of the FC-72 transient saturated and subcooled flow boiling heat transfer characteristics are not affected to a significant degree by the amplitude and period of the coolant mass flux oscillation. In fact, they resemble these for the stable flow boiling.

由实验结果发现介电冷却液的振荡振幅和周期对时间平均的FC-72暂态的饱和态和次冷态流动沸腾热传特徵没有明显的影响，类似稳态的流动沸腾。

The two tree water consumption characteristics, Populus simonii and Robinia pseudoacacie, and the interactions mechanism with environment factors were both studied at the level of leaf and singletree in terms of the modern technology of heat pulse sap flow and thermal dissipation sap flow probe. The two main purposes of study are to provide the science evidence in estimating the ecologic water consumption rules and to arrange better densities of the two tree species stand.

本文以北京市官厅库区水源涵养林的主要造林树种：小叶杨、刺槐为研究对象，采用当前国内外最先进的热脉冲式树干边材液流测定技术和热扩散式树干边材液流测定探针测定技术，从叶片和单株水平上探讨了刺槐和小叶杨的蒸腾耗水特性以及它们与环境因子之间的影响机理，其结果不仅可为更精确地估计生态用水定额提供科学依据，而且也可为该区域这两种树种的选择及其合理林分的密度起到一定的指导作用。

The results show that for the single-track shield tunnel in actual projects,the longitudinal ventilation velocity of 2.6~2.9 m/s can effectively prevent smoke from counter flow at a heat release rate of 10 MW;when the tunnel sector on fire with a longitudinal velocity of 2.9 m/s and the unfired tunnel sector with the velocity of 1~1.5 m/s from both ends,there is an air flow with the velocity of 6 m/s ...

模拟分析得出，对于地铁实际工程中的单线盾构圆形隧道，在10 MW火灾强度下，着火区间隧道内2.6~2.9 m/s左右的纵向风速可以有效阻止烟气发生逆流；在着火区间隧道2.9 m/s的纵向风速下，未着火区间隧道两端对送送风速度为1~1.5 m/s时，联络通道内有风速为6 m/s左右的气流流向着火区间隧道，可有效抑制烟气通过联络通道向未着火区间隧道蔓延，保证人员的安全疏散。

To solve the problems in present hydraulic calculations of gas pipe network such as numerous data-inputting, unprecise output and a lack of hydraulic calculation methods to keep consistent with steady flow and non-steady flow in real working conditions of gas pipe network, in the paper the author has set up a mathematical model of heat transfer process of gas in pipes on the basis of thermodynamic basic theories and obtained more accurate calculation methods of gas storage quantity in long conveying pipes and urban pipe network of high pressure. This research achievement has been applied to real pipe network.

本文研究目的是解决目前燃气管网水力计算中存在的诸如输入数据繁琐、计算精度不高、缺乏符合实际燃气管网工况的稳定流及不稳定流管网水力计算方法等问题，试图根据热力学基本理论建立燃气在管道中传热过程数学模型，给出较为精确的长输管线及城市高压管网储气量的计算方法，并将研究成果应用于实际管网运行中。

The Earth possibly is one by occupies the major part material stably the counter-flow inner layer as well as occupies the few parts the counter-flow outer layer to be composed, the former is constitutes the Earth quite stable movement, the attraction, the magnetic field and so on the macroscopic phenomenon foundation; The latter constitutes the Earth most to be rich in the change the beautiful semblance, such as: Land, islands, volcano, earthquake, plate movement and so on nature environment with each kind of great phenomenon, eliminate this this also are decide the Earth for the perfectly round spheroid basic reason, because the internal heat circular reactions is from starts, the huge energy finally becomes the Earth good fortune a beautiful rich life the star.

地球可能是一个由较稳定占绝大部分物质的对流内层以及占较少部分的对流外层组成，前者是构成地球比较稳定的运动、引力、磁场等宏观现象的基础；后者则构成地球最富于变化的美丽外表，诸如：陆地、岛屿、火山、地震、板块运动等等自然界环境与各种伟大的现象，除此这也是决定地球为浑圆球体的根本原因，因为内热循环反应是从一点开始的，巨大的能量最终把地球造化成一颗美丽的富有生命的星球。

A valve of cleanable design capable of maintaining unfavourable conditions for microbial activity on the downstream side and/or outlet of the valve, said valve comprising: A smooth and contoured body ( 5 ) with an integral upstream connector ( 1 ), downstream connector and defined fluid flow path; a flexible sealing membrane ( 9 ) being: selectively moveable into contact with the valve body to close the valve; selectively moveable out of contact with the valve body to open the valve; selectively operable to a range of positions to vary the flow rate of fluid through said valve; a defined internal shape that allows the fluid to drain out of the valve body; an elongated heater ( 7 ) secured into the valve body in a location so as not to be contact with the fluid or disrupt the internal smooth and contoured body, the heater being operative to heat the valve body to a predetermined temperature.

一种清洁设计阀，它能够在阀的下游侧和/或出口维持微生物活动的不利条件，所述的阀包括：一个平滑仿形主体(5)，它具有整体式的上游连接器(1)、下游连接器和确定的流体流动路径；一个柔性密封膜(9)，所述的密封膜：可以选择性地移动以便与所述阀体接触，从而闭合所述的阀；可以选择性地移动以便不与所述阀体接触，从而打开所述的阀；可以选择性地操作到一定范围的位置以改变通过所述阀的流体的流速；一个确定的内部形状，所述的内部形状允许流体从所述的阀体上排出来；一个细长的加热器(7)，它固定在所述阀体内的一个位置，以使加热器不与流体接触，或者说加热器不扰动内部平滑的仿形体，所述的加热器可以操作以加热阀体到预先确定的温度。

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。