热扩散系数

HT-7托卡马克等离子体电子热扩散系数与等离子体参数的关系

Relationship Between Electron Thermal Diffusivity and Plasma Parameters on the HT-7 Tokamak

PTR技术测量材料的热扩散系数的线性化方法

Linear method on measurement of thermal diffusivity by PTR technology

用激光脉冲法测量了晶体的热扩散系数，比较了晶体a轴和c轴的热扩散系数随温度的变化关系。

The thermal diffusion coefficient of the crystals were measured by the crystal pulse method .

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。

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 .

本文主要用光热辐射（PTR）技术理论来研究材料的热扩散系数和热导率。

This paper mainly studies on the thermal diffusivity and thermal conductivity by PTR method .

主要介绍从能量平衡分析来研究HT7托卡马克等离子体电子的热扩散系数。

The electron thermal conductivity in the HT 7 tokamak is obtained by analyzing the electron power balance .

结果表明，对于相变潜热随温度变化的相变过程，其主要影响因素仍然是Stefan数、相对导热系数、相对热扩散系数、相变温度宽度等基本无量纲数。

The results showed that the main influence factors on the solid liquid phase change process with a variable latent heat are Stefan number , relative thermal conductivity , relative thermal diffusivity and dimensionless phase change temperature width .

实验得到了铜在常温下的调制频率与相位差间的实验数据，通过对实验数据的线性拟合得到了铜的热扩散系数，以及铜-不锈钢在300K和20K低温下的接触界面层热阻。

The experimental data of copper was obtained about the phase lag dependence of modulation frequency at normal temperature , and the thermal diffusivity of copper was acquired by using the linear fit .

从光热辐射理论出发，推导出一维情况下PTR信号的振幅和位相表达式，讨论了光热信号的频率特性，介绍了一种用PTR技术测量不透明材料热扩散系数的优化方法；

We give PTR 's amplitude and phase signal of one dimension based on the theory of PTR , discuss the PTR 's signal 's frequency characteristic , and a method for measuring thermal diffusivity of opaque materials is introduced .

分析数据发现，胶料的热扩散系数均随温度的升高而减小，随N115炭黑填充量的增加而增大。

It is founded by analyzing the data that the thermal diffusivities of rubber decrease with increase of temperature and increase with increase of mount of N115 carbon .

将零热源项作为积雪层中含水和不含水雪层的边界，确定出相应含水和不含水雪层的有效热扩散系数。

The zero thermal source is defined as the snow without water .

利用激光法测量橡胶材料的热扩散系数及比热

Measurement of Thermal Degradation and Specific Heat of Tire Rubber by Laser Method

氯化钠水溶液热扩散系数的研究

Thermal diffusivity of aqueous solutions of sodium chloride

结果表明，热扩散系数降低时制品的硫化时间延长；

The results showed that the curing time of product extended when the heat diffusivity decreased ;

在理论分析部分，应用流体力学、传热学的基本理论，对挤出机内混炼胶的传热与流动特性进行分析；从热扩散系数、比热容和导热系数三方面来探讨混炼胶的热学性质。

In the part of theoretical analysis , the hydrodynamics and heat transfer essential theories have been used .

通过分析两个长度相同、宽度与厚度相同梁的瞬态冷却特性，获得其冷却时的温度衰减时间常数，便可以提取出表面加工多晶硅薄膜的热扩散系数。

The thermal diffusivity can be extracted from the time dependence of the two thermal resistances cooling in free air .

试验测得的断面流速、温度、紊动动能、雷诺应力等物理量，分析了分层流掺混强度和出水口附近交界面垂向热扩散系数的变化规律。

The mixing intensity and the interfacial vertical thermal diffusion coefficient near the outlet are analyzed based on the experimental data .

采用闪光脉冲法对晶体的热扩散系数进行测量，并由此计算出晶体的热导率。

Thermal diffusion coefficient was measured by flash method , and the thermal conductivity of CBN-28 was also calculated . 3 .

在相同温度下，随着含水率的增加，木材的横纹导热系数不断增大，比热增大且其随着温度的增长速率也增大，而热扩散系数减小。

Meanwhile , the thermal conductivity and specific heat increases with wood moisture content , but the thermal diffusivity decreases with the change of moisture .

石墨泡沫的孔径越小，环氧树脂浸渍量越少，复合材料的热扩散系数越大。

The smaller the pore size of graphite foams is , the lower the mass fraction of epoxy resin is , the higher thermal diffusivity would be .

采用非稳态热流法测定不同含水率稻谷的热导率和热扩散系数，进而求出比热容。

Thermal properties of rough rice were measured by the transient heat flow method using a probe that approximately as a line heat source at different moisture contents .

研究表明由于氧化铝高温熔体具有较大的热扩散系数，温度波较容易传到固液界面引起界面温度起伏；

Studies suggested that it has greater thermal diffusion coefficient because alumina high-temperature melt , temperature wave was relatively apt to pass to solid-liquid interface , so that caused the temperature of the interface to gurgitations ;

考虑材料的这种差别，保证接触热阻研究的可靠性，本文首先在所建立的光热实验平台上，进行了铜、不锈钢、铝的低温热扩散系数的实验研究。

To consider the difference , ensure the reliabilty of the investigation on thermal contact resistance , first , the thermal diffusivity on the copper , stainless steel and aluminium is studied at photothermal experimental platform .

另外，分析讨论了一次云闪放电通道各参数（温度、电子密度、电导率、电子的热导率和热扩散系数）沿通道的变化情况。

In addition , the changes of the parameters ( the temperature , the electron density , the electrical conductivity , the electron thermal conductivity and the electron thermal diffusivity ) along the discharge channel in one cloud lightning have been discussed .

而胶料中炭黑用量在25～40份范围内时，炭黑用量每增大1份，则胶料的热扩散系数增大约5%。

The heat diffusivity of the compound , in which the addition level of carbon black was in the range of 25 ~ 40 phr , increased by 5 % as the addition level of carbon black increased by every 1 phr .

以不同结构类型及密度的C/C复合材料为预制体，采用反应熔体渗透法制备了C/SiC复合材料，研究了不同结构C/SiC复合材料的密度、组分含量、热扩散系数与摩擦性能相互之间的关系。

Taking C / C composites of different structure and density as preform , C / SiC composites were prepared by reactive melt infiltration . The relationship among density , component content , thermal diffusion coefficient and friction properties of C / SiC composites was studied .

蚕茧干燥中的换热、扩散系数初探

Initial Investigations on Heat Exchange and diffusion Coefficients in Cocoon Drying

贴附射流蒸发传质法确定多孔介质热质扩散系数测定方法的研究

Study of the Measuring Method of Determining Thermal Mass Diffusivity of Porous Materials by Evaporating Mass Transfer with Adherent Jet

对多层多孔结构内传热传湿过程进行了实验方法的研究和探讨，发展了间接测定多孔材料的质扩散系数和热质扩散系数的实验方法。

The preliminary experimental research is conducted to the process of heat and moisture transfer in building elements , hence an experimental technique is developed for the indirectly measurement of mass diffusivity and thermo-mass diffusivity of the moist porous media .

采用非线性参数估计可同时估计出热扩散率、散热系数以及试样吸收的能量。

The nonlinear parameter estimation technique can simultaneously estimate the thermal conductivity , heat transfer coefficient and absorbed energy .