蒸发

Through simulating the cooling stage of a hanging water droplet and the temperature variation of cryogen droplets in cryogen spray, the model is validated by the reasonable agreement with the experimental measurements.

有关液滴初始参数对液滴蒸发冷却特性影响的研究结果表明，本模型可以为制冷剂喷雾冷却实际应用于激光治疗鲜红斑痣手术提供有效的分析方法。

The thesis can be divided into five parts as follows: First, the structural characteristics of finned-pipe evaporator are analyzed. After selecting suitable microelement controller, the heat-transfer and mass-transfer processes are analyzed for every microelement under the conditions of dryness, wetness and frostiness. Based on previous equations, some parameters of frostiness are confirmed and the frost-growing model is set up under frost condition. Some hypotheses are postulated and with the help of the equation of mass-conservation, energy-conservation and momentum-conservation, the evaporation model which fits in the dynamic simulation is built, which set a solid foundation for system simulation. Second, the starting and stopping behaviors under disturbed condition are analyzed and calculated by using the dynamic concentrative parameter model, which gives some advice to better prescribe refrigeration system and set theoretic foundation for carrying out automatic control of refrigeration system. Third, the normal running process is analyzed and calculated by means of rational matching theory, which gives some advice on how to better understand the parameter change under steady state and the affection of inlet-parameter on evaporator. Fourth, the simulation software with dynamic characteristic is designed, which can be applied to calculate thernio-parameter of cryogen, air humidity and frost thickness under different initial and boundary conditions, and to carry out dynamic simulation under conditions of dryness, wetness and frostiness, at the same time, to achieve detection and simulation at any stage from starting to stopping.

本文的主要内容如下：1对翅片管蒸发器结构特点进行分析，选取适当的微元控制体，就干、湿和霜工况下对每个微元分别进行传热传质分析，基于经验关系式确定霜的有关参数，对于霜工况下的霜生长建立模型，经适当假设，运用质量守恒、能量守恒和动量守恒方程建立适合动态仿真的蒸发器数学模型，为系统仿真奠定基础； 2对蒸发在大扰动下的开、停机过程，运用动态集中参数模型进行分析和计算，为更好地描述制冷系统运行的全过程奠定基础，同时也为制冷系统实现自动控制提供一定的理论基础； 3对蒸发器正常运行过程，运用动态分布参数和参数间定量耦合的观点来分析和计算，为更好地了解稳态工况下各点参数的变化情况及各入口参数对蒸发器动态特性的影响即蒸发器性能对各参数变化的敏感性； 4编写翅片管蒸发器动态特性仿真计算程序，可以计算不同边界条件和初始条件下的制冷剂热力参数、空气温湿度和霜厚度分布场，实现对翅片管蒸发器在干、湿和霜工况下的动态仿真。

The mechanism of made it by vacuum evaporation using DTB crystallizer is studied, and the detail of the technical flow is discussed.

本论文主要讨论了用DTB型结晶器、采用真空蒸发结晶法制备较大颗粒硫酸钠的机理、具体的工艺流程以及各种因素对结晶粒度的影响。

The mechanism of made it by vacuum evaporation using DTB crystallizer is studied, and the detail of the technical flow is discussed. The factors which influence the granularity of anhydrous sodium sulfate are studied .

本论文主要讨论了用DTB型结晶器、采用真空蒸发结晶法制备较大颗粒硫酸钠的机理、具体的工艺流程以及各种因素对结晶粒度的影响。

His words seemed to evaporate as he spoke them, deadened by the too-still air in this strange room.

他的话似乎被蒸发了，被这个奇怪房间里特别安静的空气吸收掉。

Temperature of corresponding bar conductors is the same in both change way and distribution so as that temperature of all bars is restricted within the same value and distribution scope by decalescence of medium evaporation.

与此相应的线棒导体温度具有相同变化和分布，从而将绕组所有线棒温度以介质蒸发吸热方式限制在相同的分布和量值。

The phase transition limit of the most of cooling medium is called as vaporization point. Along with the increase of decalescence of cooling medium, gas contents increases and degree of dry steam rises.

冷却介质主流发生相变的点称之为蒸发点，其后随着介质不断吸热，气态含量增多，蒸汽干度上升。

Filtration, decantation, distillation, evaporation and crystallization are physical separating methods without formation of new substances.

过滤、倾析、蒸馏、蒸发和结晶法都是物理分离法，它们没有生成新的物质。

As a result of the great decliner, the groundwater system's recharge, runoff and discharge have evolved from charactered with rain-evaporation to with exploitation; and the natural flow field charactered with flowing from piedmont to coastal plain have changed into the new charactered with exploitation, and of which groundwater decrease cones as the convergers.

水位大幅下降，使华北平原浅层地下水系统以降水-蒸发为主导的天然补径排方式演变为以人工开采为主导的新的补径排方式，从山前平原经中部平原向滨海流动的天然地下水流场演变为以开采为主导、以地下水水位降落漏斗为汇点的新流场。

Absorbs the water from the defroster and evaporates the condensation naturally.

面料凝结队服的除霜吸收水和自然蒸发，冷凝。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐