Carbon fiber reinforced polyamide 12(CF/PA12),a new material renowned for its excellent mechanical and thermal properties,has drawn significant industry attention.Using the steady-state research to heat transfer,a ser...Carbon fiber reinforced polyamide 12(CF/PA12),a new material renowned for its excellent mechanical and thermal properties,has drawn significant industry attention.Using the steady-state research to heat transfer,a series of simulations to investigate the heat transfer properties of CF/PA12 were conducted in this study.Firstly,by building two-and three-dimensional models,the effects of the porosity,carbon fiber content,and arrangement on the heat transfer of CF/PA12 were examined.A validation of the simulation model was carried out and the findings were consistent with those of the experiment.Then,the simulation results using the above models showed that within the volume fraction from 0% to 28%,the thermal conductivity of CF/PA12 increased greatly from 0.0242 W/(m·K)to 10.8848 W/(m·K).The increasing porosity had little influence on heat transfer characteristic of CF/PA12.The direction of the carbon fiber arrangement affects the heat transfer impact,and optimal outcomes were achieved when the heat flow direction was parallel to the carbon fiber.This research contributes to improving the production methods and broadening the application scenarios of composite materials.展开更多
为更好地开展自主化压水堆(pressurized water reactor,PWR)子通道分析软件传热模型的评价工作,对国家核安全局目前在审的几款国产自主化压水堆子通道分析软件的传热模型开展分析研究。首先,确认传热模型对于自主化压水堆子通道分析软...为更好地开展自主化压水堆(pressurized water reactor,PWR)子通道分析软件传热模型的评价工作,对国家核安全局目前在审的几款国产自主化压水堆子通道分析软件的传热模型开展分析研究。首先,确认传热模型对于自主化压水堆子通道分析软件的实际意义,即软件传热模型计算的相关参数主要体现在液相能量守恒方程的封闭过程中。然后通过对核态沸腾起始点(onset of nucleate boiling,ONB)模型的实验确认以及敏感性分析。最终得到ONB模型的计算偏差对通道内轴向压力、燃料包壳外壁面温度等参数的计算结果影响很小。虽然ONB模型的计算偏差会对通道内空泡份额以及偏离泡核沸腾比(departure from nucleate boiling ratio,DNBR)产生一定影响,但仅局限于ONB起始点附近位置,对后续高空泡份额、更小DNBR的通道轴向位置的参数计算影响很小。展开更多
基金Projects(52206216,52376085)supported by the National Natural Science Foundation of ChinaProject(2023JJ40744)supported by the Natural Science Foundation of Hunan Province,China。
文摘Carbon fiber reinforced polyamide 12(CF/PA12),a new material renowned for its excellent mechanical and thermal properties,has drawn significant industry attention.Using the steady-state research to heat transfer,a series of simulations to investigate the heat transfer properties of CF/PA12 were conducted in this study.Firstly,by building two-and three-dimensional models,the effects of the porosity,carbon fiber content,and arrangement on the heat transfer of CF/PA12 were examined.A validation of the simulation model was carried out and the findings were consistent with those of the experiment.Then,the simulation results using the above models showed that within the volume fraction from 0% to 28%,the thermal conductivity of CF/PA12 increased greatly from 0.0242 W/(m·K)to 10.8848 W/(m·K).The increasing porosity had little influence on heat transfer characteristic of CF/PA12.The direction of the carbon fiber arrangement affects the heat transfer impact,and optimal outcomes were achieved when the heat flow direction was parallel to the carbon fiber.This research contributes to improving the production methods and broadening the application scenarios of composite materials.
文摘为更好地开展自主化压水堆(pressurized water reactor,PWR)子通道分析软件传热模型的评价工作,对国家核安全局目前在审的几款国产自主化压水堆子通道分析软件的传热模型开展分析研究。首先,确认传热模型对于自主化压水堆子通道分析软件的实际意义,即软件传热模型计算的相关参数主要体现在液相能量守恒方程的封闭过程中。然后通过对核态沸腾起始点(onset of nucleate boiling,ONB)模型的实验确认以及敏感性分析。最终得到ONB模型的计算偏差对通道内轴向压力、燃料包壳外壁面温度等参数的计算结果影响很小。虽然ONB模型的计算偏差会对通道内空泡份额以及偏离泡核沸腾比(departure from nucleate boiling ratio,DNBR)产生一定影响,但仅局限于ONB起始点附近位置,对后续高空泡份额、更小DNBR的通道轴向位置的参数计算影响很小。
