126 documents found, page 1 of 13
Multi-objective optimization of a 2D backward-facing step channel with porous b...
Cavaleiro Costa, Sérgio; Janeiro, Fernando M.; Malico, IsabelPorous baffles can be used to enhance heat transfer in various engineering applications, including electronic cooling, gas turbine blades, and chemical reactors. Also, the backward-facing step is a widely used configuration in fluid dynamics studies due to its simplicity and relevance to real-world geometries. This study examines heat transfer and flow characteristics in a backward-facing step channel featuring...
Literature review of Computational Fluid Dynamics modelling of thermocline tanks
Mané, Junior; Domingues, Nuno; Malico, IsabelA thermocline tank consists of a thermal energy storage system that allows the continuously operation of a Concentrated Solar Power plant even during periods of solar intermittency, making it a complementary and crucial asset in this type of systems. Accordingly, it is important to conduct a thorough evaluation of the system performance and using computational fluid dynamics (CFD) to such purpose as become incr...
Optimização económica da operação de armazenamento térmico a sais fundidos com ...
Pires, Celísio; Frederico, Felizardo; Mané, Junior; Canavarro, Diogo; Malico, Isabel; Horta, PedroA biomassa lenho-celulósica apresenta-se hoje como um recurso com potenciais novos usos, nomeadamente na produção de biocombustíveis na forma líquida como o bioetanol ou o biodiesel ou biocombustíveis na forma sólida e gasosos como o carvão vegetal, o biogás ou o gás de síntese. Portugal tem cerca de 35% do seu território coberto por floresta, apresentando-se a região do Alentejo como a que apresenta a maior va...
CFD analysis of twin turbulent plane jets confined by walls: Effects of geometr...
Zdanowski, Francisco; Malico, IsabelThis study investigates the flow and heat transfer behavior of heated twin turbulent plane parallel jets confined between isothermal walls. The focus is on understanding the impact of key geometric parameters: the separation ratio and offset ratio. While dual plane offset jets have been studied in various unconfined or isothermal configurations, the combined impact of heating, confinement and jet geometry remai...
Preliminary simulation results of a molten salt thermal storage thank for conce...
Mané, Júnior; Malico, Isabel; Domingues, Nuno; Ait El Cadi, Radia; Horta, PedroMolten salt thermal storage systems play a critical role in concentrated solar power (CSP) plants, ensuring energy storage and dispatchability. Among these, thermocline tanks offer the potential for cost reduction, compared to the standard thermal storage system implemented in CSP plants: a two-tank solution (for hot and cold fluid, individually). This paper presents initial results from a Computational Fluid D...
Composite SVR based modellingof an Industrial Furnace
Santos, Daniel; Rato, Luís; Gonçalves, Teresa; Barão, Miguel; Costa, Sérgio; Malico, Isabel; Canhoto, PauloIndustrial furnaces consume a large amount of energy and their operating points have a major influence on the quality of the final product. Designing a tool that analyzes the combustion process, fluid mechanics and heat transfer and assists the work done during energy audits is then of the most importance. This work proposes a hybrid model for such a tool, having as it base two white-box models, namely a detail...
Development of a reduced-order model of an industrial billet heating furnace
Alvarez, Frederico; Costa, Sérgio; Santos, Daniel; Canhoto, Paulo; Malico, Isabel; Rato, Luís; Gonçalves, Teresa; Barão, Miguel; Lima, Rui PedroThis work is part of the ongoing efforts under the Audit Furnace project to develop a reduced-order model (ROM) that allows for fast analysis of combustion, fluid flow and heat transfer processes that occur inside industrial furnaces. A billet heating furnace is considered here, which uses propane as fuel and processes circa 5000 kg of material per hour with a billet temperature set point at the exit of 745 ºC....
A influência das obstruções na ventilação em parques de estacionamento – estudo...
Cavaleiro Costa, Sérgio; Casaca, Cláudia; Malico, Isabel; Cardoso, Ricardo; Carvalho, AldaEste artigo apresenta um estudo preliminar sobre a influência e o impacto das obstruções na eficiência e dispersão do escoamento criado pelo sistema de ventilação de um parque de estacionamento. Modelou-se uma zona representativa de um parque de estacionamento coberto considerando diferentes distâncias de obstrução a ventilador de impulso e diferentes condições de escoamento angular à sua saída. As simulações f...
Modelling and optimization of the thermal equipment network of an industrial au...
Alvarez, Frederico; Canhoto, Paulo; Malico, Isabel; Lima, Rui PedroThe energy-intensive industry is an important player in the quest to meet the ambitious plans of the European Union to reduce the consumption of fossil fuels and, consequently, the emission of greenhouse gases, mainly CO2. In that sense, energy efficiency in thermal processes in industry becomes a key point to achieve those goals. Another important measure to achieve CO2 reduction targets is the use of green hy...
Simulation of an offset wall turbulent jet flow
Zdanowski, Francisco; Malico, IsabelJet flows are commonly observed in many real-world situations, such as in the exhaust plume from a rocket, the airflow from a jet engine or combustion equipment. The jet flow is a high-speed stream of fluid expelled from a relatively narrow orifice into a surrounding fluid with a lower velocity. Factors such as the jet velocity and pressure, size and shape of the orifice, and the properties of the surrounding f...