Compared to traditional high-pressure die casting(HPDC),horizontal squeeze casting(HSC)is a more promising way to fabricate high-integrity castings,owing to a reduced number of gas and shrinkage porosities produced in...Compared to traditional high-pressure die casting(HPDC),horizontal squeeze casting(HSC)is a more promising way to fabricate high-integrity castings,owing to a reduced number of gas and shrinkage porosities produced in the casting.In this paper,the differences between HSC and HPDC are assessed,through which it is shown that the cavity filling velocity and the size of the gating system to be the most notable differences.Equipment development and related applications are also reviewed.Furthermore,numerical simulation is used to analyze the three fundamental characteristics of HSC:slow cavity filling,squeeze feeding and slow sleeve filling.From this,a selection principle is given based on the three related critical casting parameters:cavity filling velocity,gate size and sleeve filling velocity.Finally,two specific applications of HSC are introduced,and the future direction of HSC development is discussed.展开更多
This study examines the benefits of incorporating passive techniques into multilayer hollow clay brick walls to improve their dynamic thermal performance.The finite element approach was used to solve the incompressibl...This study examines the benefits of incorporating passive techniques into multilayer hollow clay brick walls to improve their dynamic thermal performance.The finite element approach was used to solve the incompressible Navier-Stokes and energy equations to analyze the dynamic thermal response of walls exposed to real thermal excitations of the Marrakesh climate.The results show that increasing the emissivity from 0.1 to 0.9 significantly increases the total heat load over 24 h.Furthermore,filling 100% of the cavities with insulation materials delayed the temperature peak by about 2.3 h and lowered the decrement factor by roughly 43%,with a value smaller than 0.07.In addition,it is demonstrated that the total thermal load is reduced by approximately 28% for improved wall configurations(100% insulation filling cavities)compared to traditional wall configurations(100% air filling cavities),which aids in improving building energy efficiency.展开更多
文摘Compared to traditional high-pressure die casting(HPDC),horizontal squeeze casting(HSC)is a more promising way to fabricate high-integrity castings,owing to a reduced number of gas and shrinkage porosities produced in the casting.In this paper,the differences between HSC and HPDC are assessed,through which it is shown that the cavity filling velocity and the size of the gating system to be the most notable differences.Equipment development and related applications are also reviewed.Furthermore,numerical simulation is used to analyze the three fundamental characteristics of HSC:slow cavity filling,squeeze feeding and slow sleeve filling.From this,a selection principle is given based on the three related critical casting parameters:cavity filling velocity,gate size and sleeve filling velocity.Finally,two specific applications of HSC are introduced,and the future direction of HSC development is discussed.
文摘This study examines the benefits of incorporating passive techniques into multilayer hollow clay brick walls to improve their dynamic thermal performance.The finite element approach was used to solve the incompressible Navier-Stokes and energy equations to analyze the dynamic thermal response of walls exposed to real thermal excitations of the Marrakesh climate.The results show that increasing the emissivity from 0.1 to 0.9 significantly increases the total heat load over 24 h.Furthermore,filling 100% of the cavities with insulation materials delayed the temperature peak by about 2.3 h and lowered the decrement factor by roughly 43%,with a value smaller than 0.07.In addition,it is demonstrated that the total thermal load is reduced by approximately 28% for improved wall configurations(100% insulation filling cavities)compared to traditional wall configurations(100% air filling cavities),which aids in improving building energy efficiency.