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RISS 인기검색어
- 검색키워드
- 저자 : R. N. Faria (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Adiabatic Capillary Tube Model for a Carbon Dioxide Transcritical Cycle
R. O. Nunes,R. N. Faria,N. Bouzidi,L. Machado,R. N. N. Koury 대한설비공학회 2015 International Journal Of Air-Conditioning and Refr Vol.23 No.2
This paper presents a mathematical model for a capillary tube using CO2 as fluid in steady flow transcritical cycle. The capillary tube is divided into N volumes controls and the model is based on applying the equations of conservation of energy, mass and momentum in the fluid in each of these volumes controls. The model calculates the mass flow of the CO2 in the capillary tube as a function of CO2 pressures at the inlet and outlet of the capillary and the temperature of CO2 at the input of this device. The capillary tube is considered to be adiabatic, and the limit of operation due to blocked flow condition is also considered in the model. The validation of the model was performed with experimental data and the results showed that the model is capable of predicting the mass flow in the capillary tube with errors less than 10%. The model was also used to determine the minimum diameter of the capillary tube for various conditions of CO2 transcritical cycle.
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SPIF-A: on the development of a new concept of incremental forming machine
R.J. Alves de Sousa,J.A.F. Ferreira,J.B. Sá de Farias,J.N.D. Torrão,D.G. Afonso,M.A.B.E Martins 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5
This paper presents the design and project of an innovative concept for a Single PointIncremental Forming (SPIF) Machine. Nowadays, equipment currently available for conducting SPIF resultmostly from the adaptation of conventional CNC machine tools that results in a limited range of applicationsin terms of materials and geometries. There is also a limited market supply of equipment dedicated toIncremental Sheet Forming (ISF), that are costly considering low batches, making it unattractive forindustry. Other factors impairing a quicker spread of SPIF are large forming times and poor geometricalaccuracy of parts. The following sections will depict the development of a new equipment, designed toovercome some of the limitations of machines currently used, allowing the development of a sounding basisfor further studies on the particular features of this process. The equipment here described possesses sixdegrees-of freedom for the tool, for the sake of improved flexibility in terms of achievable tool-paths and anextra stiffness provided by a parallel kinematics scheme. A brief state of the art about the existing SPIFmachines is provided to support the project’s guidelines.
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SPIF-A: on the development of a new concept of incremental forming machine
Alves de Sousa, R.J.,Ferreira, J.A.F.,Sa de Farias, J.B.,Torrao, J.N.D.,Afonso, D.G.,Martins, M.A.B.E. Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5
This paper presents the design and project of an innovative concept for a Single Point Incremental Forming (SPIF) Machine. Nowadays, equipment currently available for conducting SPIF result mostly from the adaptation of conventional CNC machine tools that results in a limited range of applications in terms of materials and geometries. There is also a limited market supply of equipment dedicated to Incremental Sheet Forming (ISF), that are costly considering low batches, making it unattractive for industry. Other factors impairing a quicker spread of SPIF are large forming times and poor geometrical accuracy of parts. The following sections will depict the development of a new equipment, designed to overcome some of the limitations of machines currently used, allowing the development of a sounding basis for further studies on the particular features of this process. The equipment here described possesses six-degrees-of freedom for the tool, for the sake of improved flexibility in terms of achievable tool-paths and an extra stiffness provided by a parallel kinematics scheme. A brief state of the art about the existing SPIF machines is provided to support the project's guidelines.
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