Ceramic filters are used to avoid slag and impurities in foundry applications. When not properly applied, the presence of these filters may have a significant influence on mould filling. 3-D casting simulation has bee...Ceramic filters are used to avoid slag and impurities in foundry applications. When not properly applied, the presence of these filters may have a significant influence on mould filling. 3-D casting simulation has been applied to study the effects of the use of a ceramic filter on the metal flow in a gating system. Instead of using a pressure drop model to represent the behaviour of a fluid metal flow passing through a filter, a real exact filter geometry, which is created by a high resolution CT-scan and a non-destructive imaging technique, in the gating system is applied in the simulation. In this research, nodular cast iron is poured into a block casting. A depressurized gating system is used. After a choke, a filter with different orientations is placed in the system. Mould filling coupled with temperature is simulated. Geometries using different orientations of the filter, and without the filter have been researched. The simulated results show that the filter has no influence on the pouring time of the casting if the choke section is small enough compared to the effective section of the filter. Although the filter has no significant influence on the flow patterns in the block casting itself, the flow patterns in the filter zone are different. When the liquid metal passes a horizontal filter, it will be broken into many small streams and show a shower effect. After the part under the filter is full, the shower effect disappears. When the filter is located at the vertical position, due to the gravity, the shower effect is less. If no filter presents on the system, the liquid metal passes through the filter zone with a high speed and causes surface turbulence.展开更多
Structural Heart is a new fi eld within the division of cardiovascular service lines.Structural heart has broadened the scope of delivery of cardiovascular care with its ability to deliver new valves and devices to he...Structural Heart is a new fi eld within the division of cardiovascular service lines.Structural heart has broadened the scope of delivery of cardiovascular care with its ability to deliver new valves and devices to heart patients who were once turned down for traditional open-heart surgery through the use of transcatheter delivery systems and device designs.However,in the absence of an open-surgical fi eld,the main limitation in transcatheter device development and patient-centric care is the inability of the Structural Heart Implanter to palpate the patient’s cardiac anatomy for device sizing and delivery.Application of 3D printing and 3D modeling are becoming a useful toolkit for Structural Heart Implanters,Imagers,and Device specialists within the Heart Team to use as a communication tool and case planning resource to optimize patient care,and patient safety.Transcatheter interventions have revolutionized not only the fi eld of cardiology,but additionally the fi eld of biomedical engineering within Cardiovascular Medicine through the incorporation of 3D simulation technology.展开更多
文摘Ceramic filters are used to avoid slag and impurities in foundry applications. When not properly applied, the presence of these filters may have a significant influence on mould filling. 3-D casting simulation has been applied to study the effects of the use of a ceramic filter on the metal flow in a gating system. Instead of using a pressure drop model to represent the behaviour of a fluid metal flow passing through a filter, a real exact filter geometry, which is created by a high resolution CT-scan and a non-destructive imaging technique, in the gating system is applied in the simulation. In this research, nodular cast iron is poured into a block casting. A depressurized gating system is used. After a choke, a filter with different orientations is placed in the system. Mould filling coupled with temperature is simulated. Geometries using different orientations of the filter, and without the filter have been researched. The simulated results show that the filter has no influence on the pouring time of the casting if the choke section is small enough compared to the effective section of the filter. Although the filter has no significant influence on the flow patterns in the block casting itself, the flow patterns in the filter zone are different. When the liquid metal passes a horizontal filter, it will be broken into many small streams and show a shower effect. After the part under the filter is full, the shower effect disappears. When the filter is located at the vertical position, due to the gravity, the shower effect is less. If no filter presents on the system, the liquid metal passes through the filter zone with a high speed and causes surface turbulence.
文摘Structural Heart is a new fi eld within the division of cardiovascular service lines.Structural heart has broadened the scope of delivery of cardiovascular care with its ability to deliver new valves and devices to heart patients who were once turned down for traditional open-heart surgery through the use of transcatheter delivery systems and device designs.However,in the absence of an open-surgical fi eld,the main limitation in transcatheter device development and patient-centric care is the inability of the Structural Heart Implanter to palpate the patient’s cardiac anatomy for device sizing and delivery.Application of 3D printing and 3D modeling are becoming a useful toolkit for Structural Heart Implanters,Imagers,and Device specialists within the Heart Team to use as a communication tool and case planning resource to optimize patient care,and patient safety.Transcatheter interventions have revolutionized not only the fi eld of cardiology,but additionally the fi eld of biomedical engineering within Cardiovascular Medicine through the incorporation of 3D simulation technology.
