In this work,a novel ultrahigh-strength Al-10Zn-3.5Mg-1.5Cu alloy was fabricated by powder metallurgy followed by hot extrusion.Investigations on microstructural evolution and mechanical properties of the fabricated s...In this work,a novel ultrahigh-strength Al-10Zn-3.5Mg-1.5Cu alloy was fabricated by powder metallurgy followed by hot extrusion.Investigations on microstructural evolution and mechanical properties of the fabricated samples were carried out.The results show that the grain size of sintered samples matches with the powder particles after ball milling.The relative densities of sintered and hot extruded samples reach 99.1%and 100%,respectively.Owing to the comprehensive mechanism of grain refinement,aging and dispersion strengthening,the ultimate tensile strength,yield strength and elongation of the Al-10Zn-3.5Mg-1.5Cu alloy after hot extrusion and subsequent heat treatment achieve 810 MPa,770 MPa and 8%,respectively.展开更多
Forced and mixed convection heat and mass transfer are studied numerically for water containingmetallic corrosion products in a heated or cooled vertical tube with variable thermophysical propertiesat super-critical p...Forced and mixed convection heat and mass transfer are studied numerically for water containingmetallic corrosion products in a heated or cooled vertical tube with variable thermophysical propertiesat super-critical pressures. The fouling mechanisms and fouling models are presented. The influenceof variable properties at super-critical pressures on forced or mixed convection has been analyzed.The differences between heat and mass transfer under heating and cooling conditions are discussed. Itis found that variable properties, especially buoyancy, greatly influence the fluid flow and heat masstransfer.展开更多
Flow rate distribution is important in a multi channel system when the flow is heated non-uniformly.This paper describes a steady state approach for obtaining the flow distribution among various tubes of complex multi...Flow rate distribution is important in a multi channel system when the flow is heated non-uniformly.This paper describes a steady state approach for obtaining the flow distribution among various tubes of complex multi channel system. Based on the present approach,a program has been developed,which is directly applied in thermal hydraulic design and investigation of 600MW supercritical variable-pressure once through boiler.展开更多
A numerical study is reported of laminar natural convective heat and mass transfer on a vertical cooled plate for water containing metal corrosion products at super-critical pressures. The influence of variable proper...A numerical study is reported of laminar natural convective heat and mass transfer on a vertical cooled plate for water containing metal corrosion products at super-critical pressures. The influence of variable properties at super-critical pressures on natural convection has been analyzed. The difference between heat and mass transfer under cooling or heating conditions is also discussed and some correlations for heat and mass transfer under cooling conditions are recommended.展开更多
基金Project(FRF-GF-19-012AZ)supported by the Fundamental Research Funds for the Central Universities,China。
文摘In this work,a novel ultrahigh-strength Al-10Zn-3.5Mg-1.5Cu alloy was fabricated by powder metallurgy followed by hot extrusion.Investigations on microstructural evolution and mechanical properties of the fabricated samples were carried out.The results show that the grain size of sintered samples matches with the powder particles after ball milling.The relative densities of sintered and hot extruded samples reach 99.1%and 100%,respectively.Owing to the comprehensive mechanism of grain refinement,aging and dispersion strengthening,the ultimate tensile strength,yield strength and elongation of the Al-10Zn-3.5Mg-1.5Cu alloy after hot extrusion and subsequent heat treatment achieve 810 MPa,770 MPa and 8%,respectively.
文摘Forced and mixed convection heat and mass transfer are studied numerically for water containingmetallic corrosion products in a heated or cooled vertical tube with variable thermophysical propertiesat super-critical pressures. The fouling mechanisms and fouling models are presented. The influenceof variable properties at super-critical pressures on forced or mixed convection has been analyzed.The differences between heat and mass transfer under heating and cooling conditions are discussed. Itis found that variable properties, especially buoyancy, greatly influence the fluid flow and heat masstransfer.
文摘Flow rate distribution is important in a multi channel system when the flow is heated non-uniformly.This paper describes a steady state approach for obtaining the flow distribution among various tubes of complex multi channel system. Based on the present approach,a program has been developed,which is directly applied in thermal hydraulic design and investigation of 600MW supercritical variable-pressure once through boiler.
文摘A numerical study is reported of laminar natural convective heat and mass transfer on a vertical cooled plate for water containing metal corrosion products at super-critical pressures. The influence of variable properties at super-critical pressures on natural convection has been analyzed. The difference between heat and mass transfer under cooling or heating conditions is also discussed and some correlations for heat and mass transfer under cooling conditions are recommended.
