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21.
建立了多孔毛细芯结构的平板热管在冷凝段不发生堵塞的情况下流动和传热的理论模型,分析了热管在毛细限下的最大传热量和热阻的变化.结果表明,丝网目数的增加和工作温度的升高会增大热管的传热能力,热管工质为水时的传热性能优于工质为丙酮和乙醇时的情况. 相似文献
22.
We investigate the heat generation in a nanoscale system coupled to normal leads and find that it is maximal when the average occupation of the electrons in the nanoscale system is 0.5, no matter what mechanism induces the heat generation. 相似文献
23.
波纹板式空冷器阻力与传热特性实验研究 总被引:5,自引:0,他引:5
在可改变风量和热水流量的实验条件下,对波纹板式空冷器的阻力与传热特性进行实验研究。得到了空气侧的阻力降关联式以及两侧的对流换热系数关联式,其适用于热水雷诺数在2000-8000之间、空气雷诺数在2000-10000之间。在相同工况下,比较了波纹板式、光管式和翅片管式空冷器的性能指标,结果表明:迎面风速在2.45-4.1 m/s之间,波纹板式空冷器传热系数达到100-160 W/m2/℃;约比光管式提高70%,但只有以管束外表面为基准的翅片管式传热系数的六分之一;板式空冷器单位体积换热量约是翅片管式空冷器的1.5倍,是光管式的15倍;板式空冷器单位功耗换热量约是光管式空冷器的5.5倍,而翅片管式空冷器与光管式空冷器则相差不大。 相似文献
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25.
Jian-binSong Min-qiaoRen Qing-yongChen Shu-yunWang Qing-xiangZhao Hong-fangZhang 莫志深 《高分子科学》2004,(5):491-496
Based on the X-ray scattering intensity theory and using the approximate expression for the atomic scattering factor, the correction factors for three crystalline peaks and an amorphous peak of Nylon 1212 were calculated and the formula of degree of crystallinity of Nylon 1212 was derived by a graphic multipeak resolution method. The degree of crystallinity calculated from the WAXD method is compatible with those obtained by density and calorimetry methods. 相似文献
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A coordination compound of erbium perchlorate with L-α-glutamic acid, [Er2(Glu)2(H2O)6](ClO4)4·6H2O(s), was synthesized. By chemical analysis, elemental analysis, FTIR, TG/DTG, and comparison with relevant literatures, its chemical composition and structure were established. The mechanism of thermal decomposition of the complex was deduced on the basis of the TG/DTG analysis. Low-temperature heat capacities were measured by a precision automated adiabatic calorimeter from 78 to 318 K. An endothermic peak in the heat capacity curve was observed over the temperature region of 290-318 K, which was ascribed to a solid-to-solid phase transition. The temperature Ttrans, the enthalpy △transHm and the entropy △transSm of the phase transition for the compound were determined to be: (308.73±0.45) K, (10.49±0.05) kJ·mol^-1 and (33.9±0.2) J·K^-1·mol^-1. Polynomial equation of heat capacities as a function of the temperature in the region of 78-290 K was fitted by the least square method. Standard molar enthalpies of dissolution of the mixture [2ErCl3·6H2O(s)+2L-Glu(s)+6NaClO4·H2O(s)] and the mixture {[Er2(Glu)2(H2O)6](ClO4)4·6H2O(s)+6NaCl(s)} in 100 mL of 2 mol·dm^-3 HClO4 as calorimetric solvent, and {2HClO4(1)} in the solution A' at T=298.15 K were measured to be, △dHm,1=(31.552±0.026) kJ·mol^-1, △dHm,2 = (41.302±0.034) kJ·mol^-1, and △dHm,3 = ( 14.986 ± 0.064) kJ·mol^-1, respectively. In accordance with Hess law, the standard molar enthalpy of formation of the complex was determined as △fHm-=-(7551.0±2.4) kJ·mol^-1 by using an isoperibol solution-reaction calorimeter and designing a thermochemical cycle. 相似文献
28.
根据强混合型河口海域的水流条件及边界条件特点,针对温排水污染源,从物理机制上提出了三维-多层二维平面扩散综合模型,并对实际河口海域流速场和温度场进行了模拟计算。 相似文献
29.
JeffreyYang KevinMattison 《中国颗粒学报》2003,1(5):219-222
Introduction The stability of a protein formulation to a variety of solu-tion perturbations is critical to its success as a pharma-ceutical product. Because of the sensitivity of the protein to solution changes, invasive characterization techniques can be problematic. Light scattering is a non-invasive technique that has received wide acceptance in the area of protein formulation and characterization. The scattering intensity of a small molecule is propor-tional to the square of the molecular… 相似文献
30.
本文介绍了周光主编《流体力学》(上、下册)的特色,指出这是一部全面系统讲授流体3种(动量、热量、质量)输运现象的教材,并提出了配合采用流体力学教学实验录相的建议方案 相似文献