Carlos E. F. do Amaral's research while affiliated with Federal University of Technology - Paraná/Brazil (UTFPR) and other places

... Estas mudanças de direção ocasionam perturbações nos parâmetros do escoamento bifásico líquido-gás em golfadas, portanto tornando-se necessário prever o comportamento destes escoamentos. Os estudos realizados por (Zheng et al., 1994;Hill et al., 1996;Al-Safran et al., 2005;Barbosa, 2010;e Conte et al., 2011); buscam entender o comportamento do escoamento quando se produz uma mudança de direção. Devido a este cenário, neste trabalho é desenvolvido um estudo ...

... The identification of two-phase flow regimes has been realized with optical visualization or using electric sensors, such as mesh wire [20] or capacitive sensors [21]. To the best of our knowledge, no identification methods have been proposed using the liquid velocity information. ...

... low sensors are key components in industrial control processes, which can be used for the investigation of fluid flow behaviors (for example, in pilot plants). Flow sensors based on optical fiber Bragg gratings (FBGs) have been developed and tested [1] [2][3] [4][5] [6] [7][8] [9]. In this sensor type, the Bragg wavelength shift is proportional to the force exerted by the fluid flow. ...

... Ideally, to obtain images with minimum uncertainty of the geometrical properties of the detected object, image processing can be done without further complex techniques once high contrast almost creates binary images (Cameron, 2011;Chan et al., 2007;Fu et al., 2015;Hart, 2000;Lazar et al., 2010). Other complex techniques might sometimes be necessary to extract the morphological characteristics of the target object such as subsequent filtering (Ajayi and Sheehan, 2012), morphological operations (Ahmed, 2011;Amaral et al., 2013;Widyatama et al., 2018), watersheding, and so on. ...

... Single and two-phase flow characterization using optical fiber Bragg gratings (FBG): uses hydrodynamic pressure applied by the liquid or air/liquid flow to the optical fiber induces deformation that can be detected by the FBG; given that the applied pressure is directly related to the mass flow [2], It is easy for unauthorized people to disable the monitoring system by cutting the network wires and it is difficult to locate the position of the fault in a wire. Enabling Interoperability and Extensibility of Future Supervisory Control and Data Acquisition (SCADA) system: uses satellite communications which is very expensive to operate and maintain, complex to install, large and requiring significant space to install, requiring significant amounts of power to operate and unreliable in harsh weather, the system involves network collecting data from equipment sensors that transmit and receive data with a distant control center [12]. ...

... Ofuchi et al. [103] also investigated slug flow, comparing the WMS results with those of an ultrasound probe. Do Amaral et al. [137] compared the WMS results with the prediction of the Taitel flow map [138], getting good agreement in several flow patterns. They also made an interesting qualitative comparison with high-speed camera. ...

... Deendarlianto et al. [8] detected the instantaneous liquid hold-up in adiabatic counter-current two-phase flow by using the constant electric current method (CECM) which showed a satisfying result. On the other hand, the use of high speed camera combined with image processing technique also has been used by some researchers [9][10][11][12][13][14][15][16]. Even though some limitations exist, such as the need of transparent observation area, the advantages which is provided by image processing technique make this method can be clearly classified as a powerful and potential method. ...

... Indeed, each regime has its hydrodynamics and heat and mass transfer characteristics. Various predictive models for pressure drop Shadloo et al. 2020;Thaker et al. 2021;Arabi et al. 2021c), void fraction (França and Lahey Jr 1992;Silva et al. 2011), or heat transfer coefficient (Vaze and Banerjee 2011;Hibiki 2018a, 2018b) are all flow regime-dependent. Thus, the proper estimation of flow transitions boundaries is important to establish the model equations (Zhang et al. 2017). ...

... Noninvasive analysis based on optical techniques is becoming increasingly of interest in the biomedical field [1]. Optical-based monitoring techniques are safe and simple means to detect the physical properties of light in biological tissues [2]. ...

... The second layer is the hidden layer, where the number of neurons is adjusted accordingly to achieve better classification (fixed by trial). The third layer is the output layer, and the number of neurons equals the number of unit categories of blood sample requiring discrimination [17]. ...