Auteur Jader R. Barbosa Jr.
Documents disponibles écrits par cet auteur (7)
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A 2D hybrid model of the fluid flow and heat transfer in a reciprocating active magnetic regenerator
Pablo A. Oliveira, Auteur ; Paulo V. Trevizoli, Auteur ; Jader R. Barbosa Jr., Auteur |This paper evaluates the thermal behavior of a magnetic-Brayton-based parallel plate reciprocating active magnetic regenerator (AMR). A time-dependent, 2D model of the fluid flow and the coupled heat transfer between the working fluid and the so[...]
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Paulo J. Waltrich, Auteur ; Jader R. Barbosa Jr., Auteur ; Christian J.L. Hermes, Auteur |We investigate an alternative tube-fin evaporator design (accelerated flow evaporator, AFE) in which the air-side local heat transfer coefficient is increased due to a progressive reduction of the free-flow area. For a given heat transfer rate, [...]
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Marcus Vinícius C. Alves, Auteur ; Jader R. Barbosa Jr., Auteur ; Alvaro T. Prata, Auteur |A model is presented for calculating the volume flow rate in an eccentric-tube centrifugal oil pump for reciprocating compressors. The oil pump assembly consists of a pick-up tube with an inclined inlet that is mounted off-center with the cranks[...]
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Moisés A. Marcelino Neto, Auteur ; Jader R. Barbosa Jr., Auteur |A method based on the theory of departure functions coupled with the Peng and Robinson (1976) equation of state was used to calculate the thermodynamic properties (internal energy, enthalpy, entropy and specific volume) of refrigerant-oil mixtur[...]
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Augusto G. Ulson de Souza, Auteur ; Jader R. Barbosa Jr., Auteur |An experimental assessment of the heat transfer coefficient in spray cooling of plain and enhanced upward-facing surfaces is presented. All surfaces of the heater were thermally insulated apart from the top end, onto which pieces with different [...]
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Marcus V. C. Alves, Auteur ; Jader R. Barbosa Jr., Auteur ; Alvaro T. Prata, Auteur |This work presents a mathematical analysis of an oil supply system for reciprocating compressors. The system is based on a single screw pump attached to the bottom end of the vertical rotating shaft immersed in the oil sump. The fluid flow in th[...]
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Rodrigo A. Pizarro-Recabarren, Auteur ; Jader R. Barbosa Jr., Auteur ; Cesar J. Deschamps, Auteur |The stiction effect is a source of thermodynamic losses in compressor suction and discharge systems. Deformation of the lubricant film between the valve and the seat delays the valve opening, as larger pressure differences between the cylinder a[...]
