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作为传热学理论的基本规律,傅里叶定律对于常规条件下的导热都是适用的.针对瞬态条件下的热波现象和非傅里叶导热已有不少理论和实验研究.近年来,热质理论指出在低温、极高热流密度的稳态条件下也会出现非傅里叶导热现象,其物理本质是热质惯性力作用不可忽略的体现.利用液氦制冷系统,在低温环境中对大电流加热条件下金属纳米薄膜中的导热过程进行实验研究,实验中可以产生高于1×1010Wm-2的热流密度.通过对不同金属纳米薄膜样品的重复测量,结果显示金属纳米薄膜平均温度明显高于傅里叶定律的预测值,并且温差随着热流密度的增加、环境温度的减小而逐渐增加,表明非傅里叶导热现象的存在,同热质理论的预测规律一致.
As the basic law of heat transfer theory, Fourier’s law is applicable to the heat conduction under normal conditions. There are many theoretical and experimental studies on thermal wave phenomena and non-Fourier thermal conduction under transient conditions. , Thermal theory indicates that non-Fourier thermal conduction will occur under steady state conditions of low temperature and very high heat flux density, and its physical essence is not negligible manifestation of the effect of thermal inertia force.Using liquid helium refrigeration system, in low temperature environment , The heat conduction in the metal nanofilms under high current heating was experimentally studied, and the heat flux density higher than 1 × 10 10 Wm-2 could be produced in the experiment.The repeated measurements of different metal nanofilms showed that the average The temperature is obviously higher than the predictive value of Fourier’s law, and the temperature difference increases with the increase of heat flux density and ambient temperature, which indicates that the existence of non-Fourier thermal conductivity is consistent with the prediction of heat mass theory.