Encontrado(s) 2170865 resultado(s)
Encontrada(s) 217087 página(s)
Encontrada(s) 217087 página(s)
- Silva, P.B.
- Nogueira, G. D. R.
- Duarte, C. R.
- Barrozo, Marcos
[EN] Acerola (Malpighia emarginata D.C.) is a tropical fruit which has attracted recent industrial interest, due to its high levels of bioactive compounds and vitamin C. However, acerola processing generates a substantial amount of wastes, which can represent up to 40% of total processed volume. The drying of acerola residues in a new dryer, developed by our research group, named as roto-aerated dryer, has been investigated. This dryer provides a better fluid-particle contact than the conventional rotatory dryer. A pre-drying system with infrared lamps has been installed in the feed of this new dryer. The effect of the pre-treatment of this fruit residues with ethanol was also investigated. The results shown that the roto-aerated dryer assisted by infrared radiation hybrid combined with a pre-treatment with ethanol is a good alternative for processing fruit residues, aiming their reuse. It was possible to identify conditions under which the phenolic, flavonoid, and antioxidant capacity presented high levels after drying. The main phenolic compounds were idenfied by HPLC., The authors are thankful for the financial support agencies CAPES, CNPq and FAPEMIG.
- Camacho Vidal, Mª Mar|||0000-0002-2342-2105
- Casanova, Miguel Ángel
- Fenollosa Ribera, María Loreto
- Ribal Sanchis, Francisco Javier|||0000-0002-9355-0145
- Martínez-Lahuerta, Juan José
- Martínez Navarrete, Nuria|||0000-0001-8345-8495
[EN] Fruit is a highly valuable food whose consumption should be encouraged. In addition, it would be desirable to design processes and products to channel the surplus and take advantage of the post-harvest losses that limit its fresh marketing. Freeze-drying is a known industrial process that permits the obtaining of high quality products, despite having always been labeled as very expensive. In this study, the economic feasibility of freeze-drying to obtain powdered fruit has been proven, as it yields a product more than twice as cheap as when obtained by spray-drying, recognized for its low cost., The authors thank the Ministerio de Economía y Competitividad for the financial support given through the Project AGL 2012-39103.
Implementation of P-Controller in Computational Fluid Dynamics (CFD) Simulation of a Pilot Scale Outlet Temperature Controlled Spray Dryer
- Afshar, Sepideh
- Jubaer, Hasan
- Metzger, Lloyd
- Patel, Hasmukh
- Selomulya, Cordelia
- Woo, Meng Wai
[EN] Most of the CFD simulations of spray dryers reported in the literature utilizes a fixed air inlet temperature numerical framework. In this paper, a numerical framework was introduced to model spray drying as an outlet air temperature controlled process. A P-controller numerical framework was introduced which allows the inlet temperature to be automatically adjusted based on the required outlet temperature set point. This numerical framework was evaluated with a simulation of a two-stage pilot scale spray drying system at the Davis Dairy Plant (South Dakota State University) which is used for commercial contract spray drying operation.
The infrared radiation and vacuum assisted drying kinetics of flue-cured tobacco leaf and its drying quality analysis
- Zhu, Wenkui
- Guo, Gaofei
- Liu, Chaoxian
- Cheng, Liangyuan
- Wang, Le
[EN] Dehydration is widely involved in tobacco processing such as tobacco leaf curing, tobacco trip redrying and cut tobacco drying, which plays a key role due to its effect on the physical and chemical quality of tobacco. The current drying methods in tobacco processing mainly use heat conduction, heat convection or their combination to dehydrate tobacco materials. However, radiation heat transfer as one of basic heat transferways has not been investigated in the tobacco drying. In the present work, infrared radiation dryer was designed to explore the tobacco infrared radiation drying characteristics. The effect of radiation heat transfer conditions and vacuum on the drying kinetics and temperature of tobacco leaves was investigated. Diffusion coefficient of middle tobacco leaves C2F is between 0.848×10-10 ~ 1.597×10-10 m2/s. At the same time, the pore structure andpetroleum ether tobacco extracts in dried tobacco were also analyzed in order to explore the different effects of infrared radiation drying and traditional drying technology on tobacco quality.
Determination and modelling of the particle size dependent residence time distribution in a pilot plant spray dryer
- Ruprecht, Nora
- Kohlus, Reinhard
[EN] The residence time distribution (RTD) in a pilot plant spray dryer was characterised for two kinds of air distributors (centrifugal and parallel flow) and for different atomizing air pressures. To determine the RTD - and the RTD of different particle size fractions - the particle concentration and size at the dryer outlet was measured continuously using a particle counter. Results were modelled using the Bodenstein number and the CSTR in series model. An increasing nozzle pressure leads to a decrease in mean residence time and a more narrow distribution. The influence of nozzle pressure is more pronounced than of air distributor and particle size fraction.
- Bailey, Jannika
- Castro Giráldez, Marta|||0000-0001-9360-6869
- Esteves, Alfredo
- Fito Suñer, Pedro José|||0000-0001-9666-276X
[EN] Solar ovens have become a very popular technology for cooking, specially, in underdeveloped countries where access to firewood is scarce, time consuming and expensive. The benefits of solar cooking are multiple, such as saving money, as this device requires no fuel, as well as having an important impact in the environment, decreasing carbon dioxide emissions and decreasing deforestation. One challenge for food industry is to get to know the behaviour of food cooked with solar technology. The aim of this study was to model the drying process of white and red grape in solar oven using thermodynamics and spectrophotometry measurements, controlling the irradiation effect blocking the Ultraviolet radiation using a polarized vinyl film, The authors Pedro J. Fito and Marta Castro-Giraldez acknowledge the financial support from the Spanish Ministerio de Economía, Industria y Competitividad, Programa Estatal de I+D+i orientada a los Retos de la Sociedad AGL2016-80643-R, Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER). The autor Jannika Bailey wants to thank “Servicio Español para la Internacionalización de la Educación (SEPIE)”, Bec.ar and “Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)” for the support in her PhD studies, as well as her mobility and stay in Spain.
Evaluación de la molestia psicoacústica centrada en la aspereza (Rougtheness). Validación de un nuevo modelo
- Cortés Gallego, Manuela
En este trabajo se propone validar, reajustar y en lo posible mejorar, un modelo teórico propio que nos ayude a predecir no solo la aspereza, sino los distintos parámetros psicoacústicos más representativos que determinan la calidad sonora. Para ello se modificarán y se desarrollaran ciertos programas implementados en MATLAB. También se adecuará un entorno gráfico más sencillo y visual que nos ofrecerá la posibilidad de calcular cada parámetro según un método.
Diseño, montaje y análisis de prestaciones de sistemas inalámbricos de banda ancha basados en el estándar IEEE 802.16
- Carrasco Torres, Carlos
El objetivo principal de este proyecto es comparar las diferentes prestaciones ofrecidas entre un equipo WiMAX y un Pre-WiMAX y poder así demostrar las grandes deficiencias que ofrecen los sistemas Pre-WiMAX.
- Bou Escrivà, Antoni
Conseguir que la empresa Muros Enric tenga presencia en Internet. Para ello se diseñará y realizará un sitio web con los datos más relevantes de la empresa.
Diseño e implementación de un nodo sensor para la medida de parámetros físico-químicos en piscinas climatizadas
- González Legidos, Juan Manuel
El objetivo de este proyecto es desarrollar un sistema que obtenga la información de los sensores y transmitirla por Ethernet.