This paper discusses the source of heat for spot welding and the theory of diffusion welding of brass and red copper. 探讨了点焊热量的来源和黄铜与紫铜的扩散焊机理。
Test shows that the depth of residual compressive after chemical heat treatment is correspondent with that of diffusion layer. 试验表明,化学热处理后残余压应力的深度往往与渗层深度相一致。
Influence of mineral admixtures on hydration heat of paste and chloride diffusion coefficient in concrete 掺合料对胶凝材料水化热及混凝土氯离子扩散系数的影响
The mixture ratio of C40 marine high performance concrete is optimized through test of the hydration heat of binding material, slump, chloride ion diffusion coefficient, anti-crack rand of concrete. 通过测试胶凝材料水化热、混凝土的坍落度和氯离子扩散系数、抗裂等级等性能,对C40海工混凝土的配合比进行了优化设计。
Besides the influence of temperature on specific heat of mixture, considered is also that of diffusion flow due to concentration discrepancies, thus making the theoretical model more exact. 除考虑温度对混合气比热的影响外,还考虑了由于浓度差异产生的扩散流动对混合气比热的影响,从而使理论模型进一步精确化。
The mass transfer equation was introduced into heat transfer model of falling film evaporation. The radial velocity, mass diffusion coefficient and variation of film thickness were taken into account. 将传质方程引入到垂直管降膜蒸发传热模型中,求解时考虑了径向速度、质量扩散系数和膜厚变化对传热的影响。
With actual measurement, some thermodynamic parameters such as bulk specific heat volume C ρ, coefficient of heat conductivity λ, and coefficient of heat diffusion H were obtained. 对计算中用到的材料参数如体积比热容Cρ、导热系数λ和热扩散系数H进行了实际测量和校正。
The concept of heat decomposition was put forward. Heat to the external cooler consists of both convection heat and equivalent "diffusion heat". 提出了热量分解概念,外取热器热量由对流热和当量扩散热两部分组成。
Proposes an evaluation index for the effect of a ventilation mode on controlling the highest temperature in a zone, i.e. the temperature effectiveness based on the heat source. Discusses the inverse problem of hybrid temperature diffusion. 提出了适用于评价通风方式对控制区域内最高温度的影响的指标&基于热源的温度效率,并探讨了复合温度扩散反问题。
This provides a theoretical basis for the further researching the influences of heat conductivity of coal wall on the seepage and diffusion of gas in the underground gasification of coal and the dry distillation pyrogenation of coal seam. 这为进一步研究煤壁导热对煤炭地下气化过程中气体渗流扩散及煤层干馏分解的影响,提供了必要的理论依据。
Based on the data of element diffusion, formation heat of phases and their stabilities, we-analysed the element diffusion at the interface of a binary diffusion couple and the formation of intermetallic phases. 根据元素扩散数据、相形成热和它们的稳定性,分析了二元扩散偶界面元素扩散和中间相的形成。
The temperature of heat set treatment was suggested to be 100-120 ℃ when the plasticization of plasticiser, the self-condensation of the functionalized silicone oils and coupling agents, the diffusion and thermal degradation of the macromolecular chain were considered. 考虑到增塑剂增塑作用、偶联剂及硅油自缩聚反应、大分子链的扩散以及大分子链可能热降解因素,建议热定型温度在100-120℃。
A Type of Simple Enclosed Heat Booster of Diffusion Pump 一种简易扩散泵封闭式加热器
A mathematical model using analogy principle of fluid and electrical circuit network was established. Many problems in conjunction with the pipe network, such as fluid flow in two phases, heat transfer and heat of diffusion were solved. 本课题利用流体及电网络相似性原理建立蒸汽网络的数学模型,结合网络技术解决两相流体动力学以及网络系统的传热、散热问题。
The influence of mass diffusion coefficient on the coupled heat transfer is small, and the increase of Reynolds number can restrain the component diffusion. 质扩散系数对耦合换热的影响很小,入口雷诺数的增加会抑制质扩散。
Thermo-chemical Treatment with Pure Heat Diffusion Penetration will be Replaced by Other Types of Energy Aided Diffusion Penetration in the 21~ ( st) Century 21世纪化学热处理将由其它能助扩渗代替纯热扩渗
The characteristics of mass and heat transfer of single liquid phase and gas-liquid two-phase flow in a vertical tube were studied with limiting diffusion current technique ( LDCT) and the theory of heat and mass transfer analogue. 用极限扩散电流技术(LDCT)对竖直管内的液体单相流与气液两相流的传质特性进行了测量,经三传类比由测量结果获得了传热特性。
The heat treatment experiments of carbon fiber with Ta powder at 2300'C prove that TaC was formed by diffusion of C into Ta. 炭纤维和Ta粉2300℃热处理实验表明,由于发生了C向Ta中扩散而生成TaC。
The results show that heat treatment could increase the depth of diffusion layer and rise the bounding strength of coating to substrate, but if the temperature of heat treatment was too high, the bounding strength would decrease because a brittle metallic compound formed. 结果表明:热处理可以使扩散层增厚,提高涂层与基体之间的结合强度。但是,如果热处理温度太高会生成脆性的金属间化合物,使涂层与基体之间的结合强度下降。
According to the model, oxygen consumption rate and heat liberation intensity of coal, diffusion coefficient and osmotic coefficient of oxygen is confirmed for key parameter to numerical simulation of coal self-ignition process, and these parameters are researched and test by experiment. 依据模型确定出煤自燃过程数值模拟所需的关键参数为煤的耗氧速度和放热强度及松散煤体内的氧气扩散系数和渗透系数,通过实验对其进行了研究和测试。
With the temperature of heat processing go up, the diffusion of atoms strengthen in the interface of aluminum-steel, the diffusion zone increase. 随着热处理温度的提高,铝-钢界面原子的扩散增强,扩散区域增大。
The ternary Cu-Al-Ni diffusion couples were prepared by mechanical method. The heat treatments of diffusion couples were carried out under different conditions. The interface diffusion layers were researched by means of color metallograph, microhardness and SEM. 本课题采用铆钉法制备Cu-Al-Ni三元扩散偶,将扩散偶在不同工艺条件下进行退火热处理后,利用彩色金相、显微硬度和扫描电镜等测试方法对界面扩散层特征进行观察分析。
According to the laws of heat transfer, the temperature of object surface entirely depends on the structure of the object, thermal properties of the material, the thermal diffusion rate and the heat exchange between surface and environment. 根据热传导规律,物体表面的温度完全取决于物体内部的的结构、材料的热物性、内部的热扩散率以及表面与外界环境的热交换。
At the same time, a coal stockpile temperature rising experimental table is developed. Experimental study of 2D heat and mass transfer regulation of horizontal air diffusion and vertical heat convection of coal stockpile covered with different fine coal in thickness. 同时建立了煤堆升温实验台,对覆盖不同厚度细煤煤堆沿水平方向的空气扩散和沿竖直方向的空气热对流的二维空间传热、传质规律进行了实验研究。