为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14%3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一...为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14%3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一聚土比下随着龄期延长而提高;当聚土比为14%时,地聚合物处理软土的效果比较好。同时通过SEM扫描和CT扫描试验分析了软土加固后的微观结构特征,并在此基础上对微观结构与宏观性能之间的关系进行了分析。宏观与微观关系是强度越高,结构空隙越少。研究成果为地聚合物加固软土在实际工程中的应用提供了科学依据。展开更多
For combined sensible-latent heat storage system(CSLHS)(termed as the hybrid configuration),macro encapsulation can effectively solve the leakage problem of PCMs.However,due to the poor thermal conductivity of PCMs,th...For combined sensible-latent heat storage system(CSLHS)(termed as the hybrid configuration),macro encapsulation can effectively solve the leakage problem of PCMs.However,due to the poor thermal conductivity of PCMs,the charging performance of the hybrid configuration slightly increases compared to the solid structure(with only sensible materials).Meanwhile,the natural convection in the PCMs zone could improve the charging performance.So,how to improve natural convection intensity is a key issue for the CSLHS by macro encapsulating.It is found that adding fins can significantly enhance natural convection and accelerate the melting of PCM.In this paper,we proposed the hybrid configuration with fins built-in by macro encapsulation,and analyzed its charging performance with different fin structural parameters in the PCM zone by CFD simulation.In the case,the sensible heat storage material is high-temperature concrete and the PCM is a low-melting-point mixed molten salt.We analyzed the effects of fin number,fin length and fin thickness on the charging performance of the hybrid configuration respectively.From the result,the charging performance increases with the fin number,but the increase rate gradually decreases.When the fin number is 6,the charging performance increases by 20.18%compared to the situation without fin.The charging performance increases gradually with the fin length.Compared with the hybrid configuration without fin,for each 10 mm increase in fin length,its charging performances increase by 4.09%,5.26%,7.02%,8.77%,11.70%,and 15.79%,respectively.Different from number and length of fins,the effect of thickness on the charging performance is very small.When the fin thickness increased from 1 mm to 4 mm,the charging performance only increased by 2.3%.It indicates that the main reason for the improving the charging performance is to increase the natural convection intensity by dividing the PCM zone through fins.These results show that the charging performance of the CSLHS with macro encapsulation can be im展开更多
文摘为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14%3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一聚土比下随着龄期延长而提高;当聚土比为14%时,地聚合物处理软土的效果比较好。同时通过SEM扫描和CT扫描试验分析了软土加固后的微观结构特征,并在此基础上对微观结构与宏观性能之间的关系进行了分析。宏观与微观关系是强度越高,结构空隙越少。研究成果为地聚合物加固软土在实际工程中的应用提供了科学依据。
基金supported by National Key R&D Program of China(Grant numbers 2022YFB2405202)。
文摘For combined sensible-latent heat storage system(CSLHS)(termed as the hybrid configuration),macro encapsulation can effectively solve the leakage problem of PCMs.However,due to the poor thermal conductivity of PCMs,the charging performance of the hybrid configuration slightly increases compared to the solid structure(with only sensible materials).Meanwhile,the natural convection in the PCMs zone could improve the charging performance.So,how to improve natural convection intensity is a key issue for the CSLHS by macro encapsulating.It is found that adding fins can significantly enhance natural convection and accelerate the melting of PCM.In this paper,we proposed the hybrid configuration with fins built-in by macro encapsulation,and analyzed its charging performance with different fin structural parameters in the PCM zone by CFD simulation.In the case,the sensible heat storage material is high-temperature concrete and the PCM is a low-melting-point mixed molten salt.We analyzed the effects of fin number,fin length and fin thickness on the charging performance of the hybrid configuration respectively.From the result,the charging performance increases with the fin number,but the increase rate gradually decreases.When the fin number is 6,the charging performance increases by 20.18%compared to the situation without fin.The charging performance increases gradually with the fin length.Compared with the hybrid configuration without fin,for each 10 mm increase in fin length,its charging performances increase by 4.09%,5.26%,7.02%,8.77%,11.70%,and 15.79%,respectively.Different from number and length of fins,the effect of thickness on the charging performance is very small.When the fin thickness increased from 1 mm to 4 mm,the charging performance only increased by 2.3%.It indicates that the main reason for the improving the charging performance is to increase the natural convection intensity by dividing the PCM zone through fins.These results show that the charging performance of the CSLHS with macro encapsulation can be im
