The relation of bubble nucleation rate and degree of superheat, and phase change driving force and phenomenological coefficient, were analyzed based on phenomenological theory, respectively. 基于唯象理论,分析了汽泡核化速率和过热度以及相变驱动力和唯象系数的关系。
Control of degree of superheat and the practices of anhydrous aluminium fluoride 过热度的控制与无水氟化铝的实践应用
The results show that the degree of wall superheat increases as the inlet velocity decreases and the heat flux increases. 结果表明,壁面过热度随流速的增大而减小,随热流密度的增加而增大;
The results show that P can act as deoxidizer to react with Cu and form CuPO_3. However, excessive P addition results in a larger degree of superheat of the melt, hence aggravating the oxidation. 研究表明:P元素能在烧结过程中充当脱氧剂而与Cu反应生成CuPO3;但当P过量时,则会因熔体过热倾向明显而加剧氧化;
A simple thermodynamic model is adopted to analyse the impact of such cycle parameters of the system as discharge temperature of gas cooler, evaporating temperature, efficiency of compressor and expander and degree of superheat on the optimum high pressure. 运用热力学模型分析气体冷却器出口温度、蒸发温度、压缩机效率、过热度和膨胀机效率等参数对最优高压压力的影响。
Some problems as incorrect adjustment on the degree of superheat, general failure of the thermometer bulb, matching of the capacity and freezing of the TEV are presented. 介绍了热力膨胀阀应用于空调制冷系统的几个问题:过热调整不当、感温包常见故障、容量匹配及膨胀阀冻结故障等。
It is shown that the degree of superheat of molten steel and the deoxidation alloying are main factors for the formation of skin blowhole. 明确了钢液的过热度及脱氧合金化是铸坯产生皮下气泡的主要影响因素;
The experimental results showed that the heat transfer coefficient of falling film evaporation in a vertical tube with carrying gas introduced was greatly increased, and the degree of superheat of wall was reduced. 实验结果表明,采用降膜载气蒸发,可提高传热膜系数,降低壁面过热度。还将模型计算结果与实验结果进行了比较。
The theoretical minimum dendritic size of hypoeutectic Al-7% Si alloy refined by melt superheat treatment is about 20 μ m. The effect of degree of superheat on degree of undercooling was studied. (Al)枝晶得到一定程度的细化,而且细化的程度遵循指数函数的关系,利用回归分析得到熔体过热处理理论上能够细化亚共晶Al-7%Si合金的最小枝晶尺寸大约为20μm。
It is illustrated that discharge temperature of gas cooler, efficiency of expander and degree of superheat at the inlet of compressor can exert more influence on the optimum high pressure. 结果表明,气体冷却器出口温度、过热度和膨胀机效率对最优高压压力的影响较为明显。
The effects of different casting speeds, degree of superheat and secondary cooling to the central and angle part temperatures and the final solidification point have been studied. 研究了不同拉速、过热度及二冷比水量对铸坯表面中心和角部温度及铸坯凝固终点位置的影响。
It is found that the volume evaporation rate in the mixing tube mostly depends on three factors: the initial diameter of the droplet, the degree of superheat, the mass flow of saturated water and relative velocity between superheat vapor and saturated water. 研究发现:混合管中的饱和水蒸发过程快慢,最主要取决于四个因素:水珠初始直径、饱和水质量流量、过热度和相对速度。
The control principle and realization method of the electronic expansion valve regulating degree of superheat of the outdoor evaporator and the compressor capacity regulating condenser depression of the indoor condenser to satisfy indoor heating and hot water load are studied. 研究了电子膨胀阀调节室外蒸发器过热度与压缩机变容量调节室内冷凝器过冷度、满足室内供热与热水负荷的控制原理与实现方法。
Through solving continuity equation and energy equations, the mass flow and the degree of superheat changing map in the mixing duct are obtained. 并对连续方程和能量方程进行求解,获得了混合管内过热蒸汽质量流量和过热度的变化图。