Hyper-gravity experiment enable the acceleration of the long-term transport of contaminants through fractured geological barriers.However,the hyper-gravity effect of the solute transport in fractures are not well unde...Hyper-gravity experiment enable the acceleration of the long-term transport of contaminants through fractured geological barriers.However,the hyper-gravity effect of the solute transport in fractures are not well understood.In this study,the sealed control apparatus and the 3D printed fracture models were used to carry out 1 g and N g hyper-gravity experiments.The results show that the breakthrough curves for the 1 g and N g experiments were almost the same.The differences in the flow velocity and the fitted hydrodynamic dispersion coefficient were 0.97–3.12%and 9.09–20.4%,indicating that the internal fractures of the 3D printed fracture models remained stable under hyper-gravity,and the differences in the flow and solute transport characteristics were acceptable.A method for evaluating the long-term barrier performance of low-permeability fractured rocks was proposed based on the hyper-gravity experiment.The solute transport processes in the 1 g prototype,1 g scaled model,and N g scaled model were simulated by the OpenGeoSys(OGS)software.The results show that the N g scaled model can reproduce the flow and solute transport processes in the 1 g prototype without considering the micro-scale heterogeneity if the Reynolds number(Re)critical Reynolds number(Recr)and the Peclet number(Pe)the critical Peclet number(Pecr).This insight is valuable for carrying out hyper-gravity experiments to evaluate the long-term barrier performance of low-permeability fractured porous rock.展开更多
为研究高超声速风洞部件的气动特性,运用空气的亥姆霍兹能状态方程和输运物性方程组,计算超高压工况下空气的热物性参数。将计算结果与美国国家标准与技术研究院(National Institute of Standards and Technology,NIST)数据库的实验数...为研究高超声速风洞部件的气动特性,运用空气的亥姆霍兹能状态方程和输运物性方程组,计算超高压工况下空气的热物性参数。将计算结果与美国国家标准与技术研究院(National Institute of Standards and Technology,NIST)数据库的实验数据进行比较,得到相对误差值。结果表明,空气亥姆霍兹能状态方程和输运物性方程组计算得到的空气热物性参数与NIST标准实验数据相比误差较小,可以应用于超高压状态下的空气热物性计算。展开更多
基金supported by the Basic Science Center Program for Multiphase Evolution in Hypergravity of the National Natural Science Foundation of China(No.51988101)the National Key Research and Development Project China(No.2018YFC1802300)+1 种基金the National Natural Science Foundation of China(No.42007262)the National Natural Science Foundation of China(No.42277128).
文摘Hyper-gravity experiment enable the acceleration of the long-term transport of contaminants through fractured geological barriers.However,the hyper-gravity effect of the solute transport in fractures are not well understood.In this study,the sealed control apparatus and the 3D printed fracture models were used to carry out 1 g and N g hyper-gravity experiments.The results show that the breakthrough curves for the 1 g and N g experiments were almost the same.The differences in the flow velocity and the fitted hydrodynamic dispersion coefficient were 0.97–3.12%and 9.09–20.4%,indicating that the internal fractures of the 3D printed fracture models remained stable under hyper-gravity,and the differences in the flow and solute transport characteristics were acceptable.A method for evaluating the long-term barrier performance of low-permeability fractured rocks was proposed based on the hyper-gravity experiment.The solute transport processes in the 1 g prototype,1 g scaled model,and N g scaled model were simulated by the OpenGeoSys(OGS)software.The results show that the N g scaled model can reproduce the flow and solute transport processes in the 1 g prototype without considering the micro-scale heterogeneity if the Reynolds number(Re)critical Reynolds number(Recr)and the Peclet number(Pe)the critical Peclet number(Pecr).This insight is valuable for carrying out hyper-gravity experiments to evaluate the long-term barrier performance of low-permeability fractured porous rock.
文摘为研究高超声速风洞部件的气动特性,运用空气的亥姆霍兹能状态方程和输运物性方程组,计算超高压工况下空气的热物性参数。将计算结果与美国国家标准与技术研究院(National Institute of Standards and Technology,NIST)数据库的实验数据进行比较,得到相对误差值。结果表明,空气亥姆霍兹能状态方程和输运物性方程组计算得到的空气热物性参数与NIST标准实验数据相比误差较小,可以应用于超高压状态下的空气热物性计算。
