查询词典 vapor density

The osculations are conducted on the two-dimensional hydrofoil section,based on a single-fluid model of the cavitation:the liquid/vapor mixture is considered as a homogeneous fluid whose eompsition is regulated by mass tranfer equation.The RNG k-ε turbulence model with modified eddy viscosity coefficient is used for computing,and the coefficient is related to the vapor and liquid densities in cavitated regions for simulating the cavitating flow.

实验采用高速录像技术观察了云状空化随时间的结构变化，应用 LDV 测量了云状空化条件下翼型周围的速度分布；采用 N-S 方程和基于空泡动力学方程的空化模型计算了绕水翼云状空化流场，湍流模型采用了 RNG k-ε方程，为了改善空化流动的计算精度，引入了一种与空化区域水汽相密度相关的系数，对湍流涡黏性系数进行了修正。

Flow of fluid, including liquid and mixture gas of vapor and air, is presented with Darcys law. Capillary transportation of liquid and diffusive transportation of vapor and air are considered in heat and mass transfer in porous media during drying.

液体和气体在多孔介质中的流动遵循达西定律，同时考虑了液体传输时的毛细效应和蒸汽与空气分子的相互扩散效应。

In the thesis, a mathematical simulation model is developed to describe the low-temperature multi-effect distillation configuration, including the low temperature multi-effect distiller, the preheater, the condenser, the flashing box and the thermal vapor compress, which considers the boiling point elevation and the temperature losses in the demister and vapor transmission lines.

本文建立了描述低温多效蒸馏海水淡化系统，包括的蒸发器、预热器、冷凝器、闪蒸罐和喷射器的热力过程数学模型，模型考虑了盐水沸点升高、蒸汽在除沫器和管道中流动因摩擦引起的温差损失在内的多种热力学损失。

The results indicated that,during MV drying,moisture distribution in wood was relatively uniform,without an obvious moisture content gradient along the direction of thickness of wood.Moisture distribution in wood was more uniform in the last period of drying.Above Fiber Saturation Point,the movement of moisture through wood was assumed to be permeable movement of free water and vapor under the action of pressure gradient;below FSP,moisture existing in vapor form in wood moved in response to a pressure gradient.Moisture transfer caused by heat diffusion and a moisture content gradient could be neglected.

研究结果表明：在微波真空干燥过程中，木材内部的含水率分布比较均匀，在厚度方向没有明显的整体性含水率梯度，特别是在干燥的后期，木材内部的含水率分布更加均匀；当含水率在纤维饱和点以上时，木材中的自由水和水蒸气在压力梯度的作用下以渗透流的形式在木材内部迁移；当含水率在FSP以下时，木材中的水分在压力梯度的作用下以水蒸气的形式向木材表面迁移；因热扩散、含水率梯度引起的水分迁移可以忽略不计。

Environment factor effected the water vapor flux variation. Net radiation and ground heat were key factors to affect water vapor flux.

环境因子在很大程度上制约着水汽通量的变化，以净辐射和土壤热通量地温对水汽通量的影响最大。

1 These test methods cover the determination of water vapor transmission of materials through which the passage of water vapor may be of importance, such as paper, plastic films, other sheet materials, fiberboards, gypsum and plaster products, wood products ,and plastics.

这些测试方法用于测定透湿性很重要的材料，如纸，塑料薄膜，其他板材，纤维板，石膏和石膏产品，木制产品和塑料制品等的透湿性。

To obtain sulphuric acid, Cyrus Harding had only one operation to make,to calcine the sulphate of iron crystals in a closed vase, so that thesulphuric acid should distil in vapor, which vapor, by condensation, wouldproduce the acid.

赛勒斯·史密斯制造硫酸的最后一道工序，是把硫酸铁的结晶密封在瓶子里，进行锻烧，使之蒸发为水汽，经过冷却，就可以变成硫酸了。

By way of introducing expression of salt solution concentration and Hendeson equation that describes equivalent moisture curve of hygroscopic material, the heat and mass transfer model is simplified and provides a theory proof that the transportation direction of water and vapor in the pore material is opposite but effects of two items can be integrated as an expression, Compared to traditional vapor permeating, the calculated results from the presented model in this paper that salt is not taken into considered is accurate.

根据建筑围护结构自身所处环境特点，开拓性建立了吸湿区范围内含盐多孔材料的热质迁移数学模型，通过引入描述平衡湿度曲线的Hendeson方程和盐溶液浓度的表达式，对含盐多孔介质热质迁移数学模型进行了简化，从理论上论证了多孔材料中液态水分和水蒸汽迁移二者过程的相反性和统一性。

The purpose of the study is to investigate the performance of the complex vapor chambers composed of various particle diameters (270~400mesh) and structures (particle or tree-like shapes). In this study, the wickers consisted of sintered copper powders and meshes were used to form the complex vapor chambers in the evaporation area.

中文摘要本研究利用烧结式铜粉作为均热板蒸发区之微结构，搭配铜网制成复合式均热板，探讨不同粒径(270~400mesh)及结构型态粉末经烧结之后对复合式均热板性能之影响。

Vapor explosion is a compositive multiphase phenomenon including four stages: coarse premixing, triggering, propagation and expansion. The mechanisms involved in the vapor explosion process have not been understood, which prevents predicting the explosion precisely.

蒸汽爆炸是一个综合的多相流现象，包括粗混合、触发、传播和膨胀四个阶段，目前蒸汽爆炸过程中的机理还未被完全了解，这阻碍了对蒸汽爆炸现象进行准确预测。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。