Roque Rubén Andrés García

Roque Rubén Andrés García
Spanish National Research Council | CSIC · Centro de Tecnologías Físicas "Leonardo Torres Quevedo"

Doctor of Engineering

About

19
Publications
2,307
Reads
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45
Citations
Citations since 2017
12 Research Items
44 Citations
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201720182019202020212022202302468101214
201720182019202020212022202302468101214
201720182019202020212022202302468101214

Publications

Publications (19)
Poster
Full-text available
Freeze drying processes assisted by power ultrasound require an airborne power ultrasonic transducer (APUT) [1,2] placed inside the drying chamber. The numerical study of the acoustic field generated by the APUT allows the optimization of the system in terms of maximum energy concentration and maximum efficiency of the process. The APUT transducer...
Article
Full-text available
Acoustophoretic blood plasma separation is based on cell enrichment processes driven by acoustic radiation forces. The combined influence of hematocrit and hydrodynamics has not yet been quantified in the literature for these processes acoustically induced on blood. In this paper, we present an experimental study of blood samples exposed to ultraso...
Article
Full-text available
Acoustophoretic blood plasma separation is based on cell enrichment processes driven by acoustic radiation forces. The combined influence of hematocrit and hydrodynamics has not yet been quantified in the literature for these processes acoustically induced on blood. In this paper, we present an experimental study of blood samples exposed to ultraso...
Article
The recent development of a novel family of power ultrasonic transducers with extensive radiating surfaces represents a step forward in the implementation of new airborne power ultrasonic (APU) technologies for drying process intensification at low temperature. These systems have been successfully used to assist drying of different products at labo...
Article
In order to obtain the maximum efficiency in industrial processes assisted by airborne power ultrasound, the ultrasonic systems must be capable of generating an acoustic field with a maximum energy concentration in the desired areas. In this paper, the acoustic performance of two different ultrasonic systems is presented. The first system correspon...
Conference Paper
The application of airborne power ultrasounds to enhance freeze drying processes has become a promising, green and efficient technology. It has been proved that this technology accelerates drying kinetics obtaining a good quality final product. The effectiveness of this process comes from the generation of a high-intensity ultrasonic field by an ai...
Conference Paper
Airborne power ultrasound (APU) has a great potential for food industry applications due to its ability to induce the desired physical changes in solid products such as vegetables and fruits. It has been extensively reported that the application of APU accelerates the drying rate without producing a significant impact on the final quality of the pr...
Article
Some industrial processes like particle agglomeration or food dehydration among others can be enhanced by the use of power ultrasonic technologies. These technologies are based on an airborne power ultrasonic transducer (APUT) constituted by a pre-stressed Langevin-type transducer, a mechanical amplifier and an extensive plate radiator. In order to...
Poster
Full-text available
Industrial processes assisted by airborne power ultrasound have become an attractive field for industries because of its sustainability (low energy consumption, non-pollutant or green processes). In order to obtain the desired effects, the airborne power ultrasonic transducers (APUT) have to work properly, vibrating at the desired frequency and ach...
Poster
Full-text available
The use of airborne power ultrasonic transducers (APUT) for food dehydration processes may carry important advantages regarding energy consumption, processing time and quality of the final product. The high intensity acoustic field generated by the transducer, and propagated along the processing chamber provokes the desired effects in the samples l...
Article
Food dehydration processes assisted by power ultrasound constitute an efficient and green technology. In order to obtain good results with this technology it is necessary to take into account several aspects regarding the ultrasonic generation by a power ultrasonic transducer, the energy propagation in the fluid media and absorption in the samples....
Article
Full-text available
Airborne power ultrasound is a green technology with a great potential for food and environmental applications, among others. This technology aims at producing permanent changes in objects and substances by means of the propagation of high-intensity waves through air and multiphase media. Specifically, the nonlinear effects produced in such media a...
Conference Paper
Full-text available
Resumen Los procesos asistidos por ultrasonidos de potencia se han convertido en una solución atractiva en el ámbito industrial debido a su sostenibilidad (bajo consumo energético, procesos no contaminantes). Con el fin de obtener los efectos deseados en estos procesos, los transductores ultrasónicos de potencia tienen que trabajar a la frecuencia...
Conference Paper
Full-text available
Resumen En los últimos tiempos, los procesos asistidos por ultrasonidos de potencia (UdP) se han convertido en un atractivo campo para las industrias debido a su sostenibilidad (bajo consumo energético, bajo poder contaminante...). Estos procesos están basados en la explotación adecuada de los efectos no lineales asociados a la propagación de ondas...
Article
Full-text available
Process intensification constitutes a high interesting and promising industrial area. It aims to modify conventional processes or develop new technologies in order to reduce energy needs, increase yields and improve product quality. It has been demonstrated by this research group (CSIC) that power ultrasound have a great potential in food drying pr...
Conference Paper
Full-text available
It has been proved that the use of power ultrasounds (UdP) has brought many advantages in industrial processes. Due to the nature of UdP transducers and its working regime, it is crucial to have a control and characterization system with a high process capacity and high resolution.
Conference Paper
Full-text available
This work aims to show the most recent advances on the use of power ultrasound (PU) to enhance mass transfer processes (MTP) in foodstuff. Mass transfer tests have been performed using airborne ultrasonic piezoelectric transducers working at 18 -22 kHz and power capacities from 100 W up to 300 W. The effect of ultrasound for the improvement of the...
Conference Paper
Full-text available
During the last years a great effort has been done by the Group of Ultrasonic Systems and Technologies (GSTU) CSIC towards the introduction of innovative industrial processes based on the application of airborne ultrasonic plate transducers. This technology has been specifically designed for the treatment of multiphase gaseous media characterized b...

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