Porous liquid-conducting micro-heat exchangers have garnered considerable attention for their role in efficient heat dissipation in small electronic devices.This demand highlights the need for advanced mathematical mo...Porous liquid-conducting micro-heat exchangers have garnered considerable attention for their role in efficient heat dissipation in small electronic devices.This demand highlights the need for advanced mathematical models to optimize the selection of mixed heat exchange media and equipment design.A capillary bundle evaporation model for porous liquid-conducting media was developed based on the conjugate mass transfer evaporation rate prediction model of a single capillary tube,supplemented by mercury injection experimental data.Theoretical and experimental comparisons were conducted using 1,2-propanediol-glycerol(PG-VG)mixtures at molar ratios of 1:9,3:7,5:5,and 7:3 at 120,150,and 180℃.The Jouyban-Acree model was implemented to enhance the evaporation rate predictions.For the 7:3 PG-VG mixture at 180℃under the experimental conditions of the thermal medium,the model's error reduced from 16.75%to 10.84%post-correction.Overall,the mean relative error decreased from 11.76%to 5.98%after correction.展开更多
以乙二醇和环氧氯丙烷为原料,合成了一种新的高分子化合物:聚乙二醇丙三醇(PEGG),用红外光谱和核磁共振对其进行了表征。用流延法制备了丝素蛋白/PEGG共混膜,用X射线衍射法,红外光谱法对共混膜的结构进行测试分析,结果表明,随着PEGG含...以乙二醇和环氧氯丙烷为原料,合成了一种新的高分子化合物:聚乙二醇丙三醇(PEGG),用红外光谱和核磁共振对其进行了表征。用流延法制备了丝素蛋白/PEGG共混膜,用X射线衍射法,红外光谱法对共混膜的结构进行测试分析,结果表明,随着PEGG含量的增加,丝素蛋白(SF)的结晶度有所下降,PEGG与丝素蛋白之间有氢键结合,因此可能抑制了s ilkⅠ结晶。测试了共混膜的力学性能,结果表明,共混膜的断裂伸长率、弹性随着PEGG含量的增加而增大,共混膜的断裂强度均高于24M Pa,而杨氏模量都小于80 M Pa。SF/PEGG共混膜具有良好的柔软性和弹性。展开更多
分别采用乙醇、乙二醇和丙三醇为钴离子溶剂,用水合肼在室温下还原钴盐制备钴粉,研究了不同钴离子溶剂对所制备钴粉形貌的影响及其机理。研究结果表明:所制备的钴粉均由FCC和HCP两相混合组成。以乙醇为钴离子溶剂,当钴离子的浓度足够低...分别采用乙醇、乙二醇和丙三醇为钴离子溶剂,用水合肼在室温下还原钴盐制备钴粉,研究了不同钴离子溶剂对所制备钴粉形貌的影响及其机理。研究结果表明:所制备的钴粉均由FCC和HCP两相混合组成。以乙醇为钴离子溶剂,当钴离子的浓度足够低时(0.045 mol/L),出现树枝状的颗粒,其余钴离子浓度下,原生钴颗粒形貌为类球形。采用多元醇(乙二醇、丙三醇)为钴离子溶剂时,由于一定量的多元醇会聚集形成微反应器,有利于表面光滑的球形原生钴粉颗粒生成。乙醇的添加量通过影响晶核的形核、生长、扩散等过程来影响产物形貌。多元醇的添加量主要通过影响溶液的黏度和微反应器的完整性和数量等来影响产物的形貌。乙二醇的添加量在80 m L时,获得了均匀的、表面光滑的球形钴粉颗粒。展开更多
基金the funding support of National Natural Science Foundation of China(21978204)。
文摘Porous liquid-conducting micro-heat exchangers have garnered considerable attention for their role in efficient heat dissipation in small electronic devices.This demand highlights the need for advanced mathematical models to optimize the selection of mixed heat exchange media and equipment design.A capillary bundle evaporation model for porous liquid-conducting media was developed based on the conjugate mass transfer evaporation rate prediction model of a single capillary tube,supplemented by mercury injection experimental data.Theoretical and experimental comparisons were conducted using 1,2-propanediol-glycerol(PG-VG)mixtures at molar ratios of 1:9,3:7,5:5,and 7:3 at 120,150,and 180℃.The Jouyban-Acree model was implemented to enhance the evaporation rate predictions.For the 7:3 PG-VG mixture at 180℃under the experimental conditions of the thermal medium,the model's error reduced from 16.75%to 10.84%post-correction.Overall,the mean relative error decreased from 11.76%to 5.98%after correction.
文摘以乙二醇和环氧氯丙烷为原料,合成了一种新的高分子化合物:聚乙二醇丙三醇(PEGG),用红外光谱和核磁共振对其进行了表征。用流延法制备了丝素蛋白/PEGG共混膜,用X射线衍射法,红外光谱法对共混膜的结构进行测试分析,结果表明,随着PEGG含量的增加,丝素蛋白(SF)的结晶度有所下降,PEGG与丝素蛋白之间有氢键结合,因此可能抑制了s ilkⅠ结晶。测试了共混膜的力学性能,结果表明,共混膜的断裂伸长率、弹性随着PEGG含量的增加而增大,共混膜的断裂强度均高于24M Pa,而杨氏模量都小于80 M Pa。SF/PEGG共混膜具有良好的柔软性和弹性。
文摘分别采用乙醇、乙二醇和丙三醇为钴离子溶剂,用水合肼在室温下还原钴盐制备钴粉,研究了不同钴离子溶剂对所制备钴粉形貌的影响及其机理。研究结果表明:所制备的钴粉均由FCC和HCP两相混合组成。以乙醇为钴离子溶剂,当钴离子的浓度足够低时(0.045 mol/L),出现树枝状的颗粒,其余钴离子浓度下,原生钴颗粒形貌为类球形。采用多元醇(乙二醇、丙三醇)为钴离子溶剂时,由于一定量的多元醇会聚集形成微反应器,有利于表面光滑的球形原生钴粉颗粒生成。乙醇的添加量通过影响晶核的形核、生长、扩散等过程来影响产物形貌。多元醇的添加量主要通过影响溶液的黏度和微反应器的完整性和数量等来影响产物的形貌。乙二醇的添加量在80 m L时,获得了均匀的、表面光滑的球形钴粉颗粒。
