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Journal articles on the topic 'Automation; Fluid behavior; Flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Janocha, H., B. Rech, and R. Bölter. "PRACTICE-RELEVANT ASPECTS OF CONSTRUCTING ER FLUID ACTUATORS." International Journal of Modern Physics B 10, no. 23n24 (October 30, 1996): 3243–55. http://dx.doi.org/10.1142/s0217979296001690.

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The flow resistance of electrorheological fluids (ER fluids) can be controlled by applying electric fields. Thus, ER fluids are suitable for the application in actuators, using high-voltage sources for the generation of the field. The behaviour of an ER fluid actuator not only depends on the properties of the individual actuator components (ER fluid, energy transducer and energy source) but especially on their combined efforts as a system. Based on a possible scheme for the design of ER fluid actuators, this paper presents important practice-relevant aspects of a systematic actuator construction. Here the behaviour of a commercial ER suspension is examined and compared to a homogeneous ER fluid without yield point using a rotational viscometer and a flow-mode damper realized at the Laboratory of Process Automation (LPA) of the University of Saarland.

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Jinasena, Asanthi, and Roshan Sharma. "Estimation of Mud Losses during the Removal of Drill Cuttings in Oil Drilling." SPE Journal 25, no. 05 (June 18, 2020): 2162–77. http://dx.doi.org/10.2118/201230-pa.

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Summary Quantification of fluid losses at the topside is beneficial for early kick-loss detection and automation of the drilling operation. A model-based estimator is a useful tool for this purpose. The real-time estimation of the amount of fluid losses with the cuttings removal could significantly help in this regard, especially for kick detection and automation. However, to the authors’ knowledge, there is no published literature on such attempts. Therefore, a simple dynamic mathematical model of the complete closed-loop oil-well drilling system is developed in this study for estimation of the fluid losses during the removal of drill cuttings at the topside, as well as for monitoring the flow of return fluid during drilling. Furthermore, this model could provide information about the topside fluid-flow rates and fluid losses to other monitoring systems, such as kick- and loss-detection systems and automation systems. The model is used to estimate both the mud-pit level and the fluid losses during the removal of the drill cuttings through the solids-removal equipment. The model-order reduction of the flowline model using orthogonal collocation allows the model to be used in real-time estimations and/or with control systems. It is simple, easy to implement, and, more importantly, shows the necessary dynamic behavior of both the bottomside and topside of a drilling operation simultaneously. The topside model can be used together with bottomside models of varying complexity to estimate both the bottomhole pressure and the fluid losses through the solids-removal system.

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Junchangpood, Aphaiwong. "Study on Dynamic Characteristics of DC Valve in Electro-Hydraulic System Using CFD Simulation." Applied Mechanics and Materials 619 (August 2014): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amm.619.278.

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The development of an intelligence control system has presently been widely studied for application in areas of automation industries, especially an electro-hydraulic system (EHS). Usually, it has the position, force and speed controls which are sensitive to change in the system parameters. Hence, a multi-input multi-output (MIMO) fuzzy controller has recently been proposed to control those parameters in a complex system. However, a mathematical model of the EHS which included the dynamic parameters has not yet been clarified. The objective of this paper is to analyze numerically the dynamic characteristics of the directional control valve (DCV) and also the flow behaviors in the electro-hydraulic system control. The spool displacements of 4/3 hydraulic closed center DCV and flow-pressure coefficient were simulated with the computational fluid dynamics (CFD). Furthermore, this paper presents CFD results, which explain the flow behaviors related with the dynamic characteristics of flow-pressure coefficient. The simulation results show that those coefficients show non-linear correlation with the opening spool displacements.

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Price, Morgan, John Lee, Azadeh Dinparastdjadid, Heishiro Toyoda, and Joshua Domeyer. "Effect of Automation Instructions and Vehicle Control Algorithms on Eye Behavior in Highly Automated Vehicles." International Journal of Automotive Engineering 10, no. 1 (2019): 73–79. http://dx.doi.org/10.20485/jsaeijae.10.1_73.

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DinparastDjadid, Azadeh, John D. Lee, Chris Schwarz, Vindhya Venkatraman, Timothy L. Brown, John Gasper, and Pujitha Gunaratne. "After Vehicle Automation Fails: Analysis of Driver Steering Behavior after a Sudden Deactivation of Control." International Journal of Automotive Engineering 9, no. 4 (2018): 208–14. http://dx.doi.org/10.20485/jsaeijae.9.4_208.

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Mazur-Milecka, Magdalena, Jacek Ruminski, Wojciech Glac, and Natalia Glowacka. "Detection and Model of Thermal Traces Left after Aggressive Behavior of Laboratory Rodents." Applied Sciences 11, no. 14 (July 20, 2021): 6644. http://dx.doi.org/10.3390/app11146644.

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Automation of complex social behavior analysis of experimental animals would allow for faster, more accurate and reliable research results in many biological, pharmacological, and medical fields. However, there are behaviors that are not only difficult to detect for the computer, but also for the human observer. Here, we present an analysis of the method for identifying aggressive behavior in thermal images by detecting traces of saliva left on the animals’ fur after a bite, nape attack, or grooming. We have checked the detection capabilities using simulations of social test conditions inspired by real observations and measurements. Detection of simulated traces different in size and temperature on single original frame revealed the dependence of the parameters of commonly used corner detectors (R score, ranking) on the parameters of the traces. We have also simulated temperature of saliva changes in time and proved that the detection time does not affect the correctness of the approximation of the observed process. Furthermore, tracking the dynamics of temperature changes of these traces allows to conclude about the exact moment of the aggressive action. In conclusion, the proposed algorithm together with thermal imaging provides additional data necessary to automate the analysis of social behavior in rodents.

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Sun, Quan, Tao Tang, Hongfeng Chai, Jie Wu, and Yang Chen. "Boosting Fraud Detection in Mobile Payment with Prior Knowledge." Applied Sciences 11, no. 10 (May 11, 2021): 4347. http://dx.doi.org/10.3390/app11104347.

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With the prevalence of mobile e-commerce, fraudulent transactions conducted by robots are becoming increasingly common in mobile payments, which is severely undermining market fairness and resulting in financial losses. It has become a difficult problem for mobile applications to identify robotic automation accurately and efficiently from a massive number of transactions. The current research does not propose any effective method or engineering implementation. In this article, an extension to boost algorithms is presented that permits the incorporation of prior human knowledge as a means of compensating for a training data shortage and improving prediction results. Prior human knowledge is accumulated from historical fraud transactions or transferred from different domains in the form of expert rules and blacklists. The knowledge is applied to extract risk features from transaction data, risk features together with normal features are input into the boosting algorithm to perform training, and therefore we incorporate boosting algorithm with prior human knowledge to improve the performance of the model. For the first time we verified the effectiveness of the method via a widely deployed mobile APP with 150+ million users, and by taking experiments on a certain dataset, the extended boosting model shows an accuracy increase from 0.9825 to 0.9871 and a recall rate increase from 0.888 to 0.948. We also investigated feature differences between robots and normal users and we discovered the behavior patterns of robotic automation that include less spatial motion detected by device sensors (1/10 of normal user pattern), higher IP group-clustering ratio (60% in robots vs. 15% in normal users), higher jailbroken device rate (92.47% vs. 4.64%), more irregular device names and fewer IP address changes. The quantitative analysis result is helpful for APP developers and service providers to understand and prevent fraudulent transactions from robotic automation.This article proposed an optimized boosting model, which has better use in the field of robotic automation detection of mobile phones. By combining prior knowledge and feature importance analysis, the model is more robust when the actual dataset is unbalanced or with few-short samples. The model is also more explainable as feature analysis is available which can be used for generating disposal rules in the actual fake mobile user blocking systems.

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Iqbal, Umair, Johan Barthelemy, Wanqing Li, and Pascal Perez. "Automating Visual Blockage Classification of Culverts with Deep Learning." Applied Sciences 11, no. 16 (August 18, 2021): 7561. http://dx.doi.org/10.3390/app11167561.

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Blockage of culverts by transported debris materials is reported as the salient contributor in originating urban flash floods. Conventional hydraulic modeling approaches had no success in addressing the problem primarily because of the unavailability of peak floods hydraulic data and the highly non-linear behavior of debris at the culvert. This article explores a new dimension to investigate the issue by proposing the use of intelligent video analytics (IVA) algorithms for extracting blockage related information. The presented research aims to automate the process of manual visual blockage classification of culverts from a maintenance perspective by remotely applying deep learning models. The potential of using existing convolutional neural network (CNN) algorithms (i.e., DarkNet53, DenseNet121, InceptionResNetV2, InceptionV3, MobileNet, ResNet50, VGG16, EfficientNetB3, NASNet) is investigated over a dataset from three different sources (i.e., images of culvert openings and blockage (ICOB), visual hydrology-lab dataset (VHD), synthetic images of culverts (SIC)) to predict the blockage in a given image. Models were evaluated based on their performance on the test dataset (i.e., accuracy, loss, precision, recall, F1 score, Jaccard Index, region of convergence (ROC) curve), floating point operations per second (FLOPs) and response times to process a single test instance. Furthermore, the performance of deep learning models was benchmarked against conventional machine learning algorithms (i.e., SVM, RF, xgboost). In addition, the idea of classifying deep visual features extracted by CNN models (i.e., ResNet50, MobileNet) using conventional machine learning approaches was also implemented in this article. From the results, NASNet was reported most efficient in classifying the blockage images with the 5-fold accuracy of 85%; however, MobileNet was recommended for the hardware implementation because of its improved response time with 5-fold accuracy comparable to NASNet (i.e., 78%). Comparable performance to standard CNN models was achieved for the case where deep visual features were classified using conventional machine learning approaches. False negative (FN) instances, false positive (FP) instances and CNN layers activation suggested that background noise and oversimplified labelling criteria were two contributing factors in the degraded performance of existing CNN algorithms. A framework for partial automation of the visual blockage classification process was proposed, given that none of the existing models was able to achieve high enough accuracy to completely automate the manual process. In addition, a detection-classification pipeline with higher blockage classification accuracy (i.e., 94%) has been proposed as a potential future direction for practical implementation.

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Korobko, Ivan, Anna Pysarets, and Andrii Misiats. "RESEARCH AUTOMATION OF FLUID FLOW TRANSDUCERS DYNAMIC CHARACTERISTICS." Bulletin of Kyiv Polytechnic Institute. Series Instrument Making, no. 56(2) (December 20, 2018): 91–96. http://dx.doi.org/10.20535/1970.56(2).2018.152457.

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10

Pacheco Quiñones, Daniel, Maria Paterna, and Carlo De Benedictis. "Automatic Electromechanical Perturbator for Postural Control Analysis Based on Model Predictive Control." Applied Sciences 11, no. 9 (April 29, 2021): 4090. http://dx.doi.org/10.3390/app11094090.

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Objective clinical analyses are required to evaluate balance control performance. To this outcome, it is relevant to study experimental protocols and to develop devices that can provide reliable information about the ability of a subject to maintain balance. Whereas most of the applications available in the literature and on the market involve shifting and tilting of the base of support, the system presented in this paper is based on the direct application of an impulsive (short-lasting) force by means of an electromechanical device (named automatic perturbator). The control of such stimulation is rather complex since it requires high dynamics and accuracy. Moreover, the occurrence of several non-linearities, mainly related to the human–machine interaction, signals the necessity for robust control in order to achieve the essential repeatability and reliability. A linear electric motor, in combination with Model Predictive Control, was used to develop an automatic perturbator prototype. A test bench, supported by model simulations, was developed to test the architecture of the perturbation device. The performance of the control logic has been optimized by iterative tuning of the controller parameters, and the resulting behavior of the automatic perturbator is presented.

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Włodarczak, Sylwia, Marek Ochowiak, Michał Doligalski, Bartosz Kwapisz, Andżelika Krupińska, Marcin Mrugalski, and Magdalena Matuszak. "Flow Rate Control by Means of Flow Meter and PLC Controller." Sensors 21, no. 18 (September 14, 2021): 6153. http://dx.doi.org/10.3390/s21186153.

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This paper presents a design of a flow meter based on a programmable logic controller (PLC). The new construction of a flow meter controlled by PLC increases the possibilities for the control and automation of fluid flow. Additionally, the didactic potential of the use of simple automation in the form of a programmable logic controller was considered. A device enabling the measurement of fluid flow rate based on a PLC controller was designed, constructed, and tested. The choice of device was the Gems Sensors FT-210 series turbine flow sensor, which is characterized by low purchase and maintenance costs. The properties and the chemical resistance of polyamide-12, the material the sensor is made of, make it possible to test the flow of various types of fluids. As part of the work, an algorithm and a program controlling the device was developed based on the APB Soft software, enabling the accurate reading of the number of impulses sent by the turbine flow sensor. The results of the designed flow meter were compared with the results obtained for the Krohne VA-40 high accuracy rotameter.

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Götz, Joachim, Hartmut Balzer, and Ruth Hinrichs. "Characterisation of the Structure and Flow Behaviour of Model Chocolate Systems by Means of NMR and Rheology." Applied Rheology 15, no. 2 (April 1, 2005): 98–111. http://dx.doi.org/10.1515/arh-2005-0005.

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Abstract In order to characterise the structure and flow behaviour of model chocolate systems Nuclear Magnetic Resonance (NMR) and rheometry were used to determine the T1 - and T2 - NMR relaxation times and their corresponding flow functions. T1 and T2 characterise the molecular mobility of fluids and correlate with both the zero-shear-rate and infinity viscosity of various chocolate model systems (determined with rotational rheometry and capillary rheometry). Based on this correlation, NMR provides the possibility to determine characteristic viscosities of chocolate masses by means of NMR-relaxation experiments. The viscosities of chocolate masses are important process parameters, as they are used for quality control of the production process. An online process viscosimetry via T2 relaxation would allow the installation of an efficient process control and, thus, a process automation. This NMR application with comparatively short measuring times is especially interesting for disperse systems where the use of conventional rheometric techniques may cause large errors. The only prerequisite for the measurement of the viscosities using NMR is a previous calibration. This was performed with the help of rotational and capillary rheometry. The NMR self-diffusion experiments are especially appropriate to characterise the influence of emulsifiers on the structure and the flow behaviour of chocolate masses.

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13

Tokmajyan, H. V., and T. A. Sarukhanyan. "Research of Nonstationary Laminar Flow of Decelerating Viscous Fluid in Circular Cylindrical Communications." Advanced Materials Research 1020 (October 2014): 361–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1020.361.

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Flow of viscous fluid in automation and control hydraulic systems usually is nonstationary. In such conditions research of viscous fluid unstable flow are important first of all for obtaining hydraudynamic parameters of flow and secondly, they will enable to design the system accurately and provide efficient performance of an actuator. Study of nonstationary flow of viscous fluid in cylindrical canals of circular cross-section was carried out when pressure gradiend of stationary moving flow suddenly decreases resulting in slow down of motion of fluid particles. As a result quadrically parabolic pattern of velocities is changed and their rearrangement occurs leading to a change of the flow hydraudynamic parameters. A boundary problem has been defined for the above conditions, preliminary and initial conditions have been determined and respective hydraudynamic parameters of the flow obtained. These parameters enable to reveal energy losses formation mechanism and evaluate their measure.

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14

Li, Wen Ting. "Flow Behavior of Polymer Viscoelastic Fluid in Complex Channel." Advanced Materials Research 774-776 (September 2013): 379–82. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.379.

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A finite volume method for the numerical solution of viscoelastic flows is given. The flow of a differential Phan-Thien-Tanner (PTT) fluid through an abrupt expansion-contraction channel has been chosen as a prototype example. Through the results of numerical simulations, the contours of velocity and stream function are drawn. Numerical results show that the viscoelasticity of polymer solutions is the main factor influencing the sweep efficiency. With increasing elasticity, the flowing area in the channel is enlarged significantly, thus the area with immobile zones becomes smaller, the microcosmic sweep efficiency increases. The visco-elastic nature of the displacing polymer fluids can ingeneral improve the displacement efficiency in pores compared to using Newtonian fluids. This conclusion should be useful in selecting polymer fluids and designing polymer flooding operations.

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15

Nagashima, Masayuki, Tomiichi Hasegawa, and Takatsune Narumi. "Flow Behavior of Bingham Fluid in a Slot Die." Nihon Reoroji Gakkaishi 34, no. 2 (2006): 91–96. http://dx.doi.org/10.1678/rheology.34.91.

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16

Duan, Haojian, Piotr Roman Scheller, Ying Ren, and Lifeng Zhang. "Fluid Flow and Inclusion Behavior Around Spherical-Cap Bubbles." JOM 71, no. 1 (October 24, 2018): 69–77. http://dx.doi.org/10.1007/s11837-018-3193-5.

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17

Yang, G., and M. A. Ebadian. "Fluid Flow Behavior in the Curved Annular Sector Duct." Journal of Fluids Engineering 116, no. 1 (March 1, 1994): 53–60. http://dx.doi.org/10.1115/1.2910241.

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A numerical analysis of the axial and secondary flow behavior in a curved annular sector duct is presented in the paper. The flow is considered to be fully developed laminar flow with constant physical properties. Five parameters have been identified as major variables in controlling the flow behavior. The study indicates that with a moderate Dean number and when the sector angle is smaller than π/2, only two vortices will appear in the cross section of the curved annular sector duct. When the sector angle is larger than π/2, the vortex structure can be very complex, and is often determined by other parameters, especially by the angle between the annular sector duct centerline and the curvature radius direction. The friction coefficient of the curved annular sector duct is affected mainly by the radius ratio, curvature, and axial pressure gradient. The radius ratio of the inner/outer walls can affect the vortex structure only when the radius ratio is very small. When the radius ratio is larger than 0.6, the friction coefficient is only slightly higher than that of a straight annular sector duct. Nevertheless, for the small radius ratio duct, the friction coefficient can be tripled, as compared with a straight annular sector duct. Although the holding pipe curvature and the axial pressure gradient cannot significantly change the vortex structure of the secondary flow, they can however, remarkably increase the friction coefficient by increasing the velocity gradient near the solid boundary.

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van Zwieten, D. A. J., E. Lefeber, and I. J. B. F. Adan. "Optimal periodical behavior of a multiclass fluid flow network." IFAC Proceedings Volumes 46, no. 24 (September 2013): 95–100. http://dx.doi.org/10.3182/20130911-3-br-3021.00070.

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19

Jönsson, K. Ann-Sofi, and Bengt T. L. Jönsson. "Fluid flow in compressible porous media: II: Dynamic behavior." AIChE Journal 38, no. 9 (September 1992): 1349–56. http://dx.doi.org/10.1002/aic.690380905.

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Tian, Yu, Minliang Zhang, Xuli Zhu, Jile Jiang, Yonggang Meng, and Shizhu Wen. "The transient behavior of electrorheological fluid in tensile flow." Smart Materials and Structures 19, no. 7 (June 17, 2010): 079801. http://dx.doi.org/10.1088/0964-1726/19/7/079801.

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Tian, Yu, Minliang Zhang, Xuli Zhu, Jile Jiang, Yonggang Meng, and Shizhu Wen. "The transient behavior of electrorheological fluid in tensile flow." Smart Materials and Structures 18, no. 12 (October 29, 2009): 125021. http://dx.doi.org/10.1088/0964-1726/18/12/125021.

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22

Rezaee, Mohammad, and Hojat Ghassemi. "Anomalous behavior of fluid flow through thin carbon nanotubes." Theoretical and Computational Fluid Dynamics 34, no. 1-2 (March 16, 2020): 177–86. http://dx.doi.org/10.1007/s00162-020-00521-3.

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23

Day, C., J. A. Harris, J. Soria, D. V. Boger, and M. C. Welsh. "Behavior of an elastic fluid in cylindrical swirling flow." Experimental Thermal and Fluid Science 12, no. 2 (February 1996): 250–55. http://dx.doi.org/10.1016/0894-1777(95)00091-7.

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24

Atmajaya, Surya, Aswadul Fitri Saiful rahman, and A. Asni B. "PERANCANGAN CONTROL SYSTEM PENGISIAN FLUIDA OTOMATIS MENGGUNAKAN SENSOR ULTRASONIC SEBAGAI LEVEL AIR & SENSOR FLOW INDIKASI ALIRAN AIR BERBASIS IOT." Jurnal Teknik Elektro Uniba (JTE Uniba) 4, no. 1 (November 23, 2019): 18–22. http://dx.doi.org/10.36277/jteuniba.v4i1.49.

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The technology applied in some small and medium businesses still applies conventional processes so that the effectiveness of production is less than optimal, on the other hand the technology develops rapidly, especially industrial automation, for example conventional activities where an officer has to monitor and record every water level held in reservoir / tank, this activity can be replaced by an electronic system, which automatically carries out monitoring by reading parameters on the sensor. By creating an automatic reservoir fluid filling system and ESP 8266 based fluid level monitoring integrated with internet network and LCD Touchscreen to facilitate the operator in monitoring fluid levels in the reservoir and fluid filling automatically

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Chew, John W., and Nicholas J. Hills. "Computational fluid dynamics for turbomachinery internal air systems." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 365, no. 1859 (May 22, 2007): 2587–611. http://dx.doi.org/10.1098/rsta.2007.2022.

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Considerable progress in development and application of computational fluid dynamics (CFD) for aeroengine internal flow systems has been made in recent years. CFD is regularly used in industry for assessment of air systems, and the performance of CFD for basic axisymmetric rotor/rotor and stator/rotor disc cavities with radial throughflow is largely understood and documented. Incorporation of three-dimensional geometrical features and calculation of unsteady flows are becoming commonplace. Automation of CFD, coupling with thermal models of the solid components, and extension of CFD models to include both air system and main gas path flows are current areas of development. CFD is also being used as a research tool to investigate a number of flow phenomena that are not yet fully understood. These include buoyancy-affected flows in rotating cavities, rim seal flows and mixed air/oil flows. Large eddy simulation has shown considerable promise for the buoyancy-driven flows and its use for air system flows is expected to expand in the future.

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Soya, Yuki, Shoichiro Yoshihara, Yuki Ohmura, Bryan J. Mac Donald, and Emmet Galvin. "Corrosion Behavior of Engineering Materials in Flow Field." Advanced Materials Research 922 (May 2014): 722–27. http://dx.doi.org/10.4028/www.scientific.net/amr.922.722.

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In this study, the effect of fluid flow rate, surface roughness and strain level on the corrosion behavior of magnesium alloy AZ31 was characterized in a custom test bench. Specimens were prepared by mechanical polishing and subject to flow in a simulated body fluid at 37°C for 24 hrs. Compared to a specimen pre-strain of 0%, mass loss was shown to increase by approximately 6% with a specimen pre-strain of 10%. Similarly, mass loss increased by approximately 13% when the fluid flow rate was increased from 250ml/min to 500ml/min. Surface roughness had a significant influence on corrosion behavior. Compared to a specimen polished with a 1 µm diamond paste, the mass loss for a specimen polished with #600 sandpaper was 28% greater.

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de Deus, Hilbeth P. Azikri, Guilherme S. Paez Dupim, and Claudio R. Avila da Silva. "Some Aspects over Thixotropic Fluid Behavior." Advanced Materials Research 629 (December 2012): 623–34. http://dx.doi.org/10.4028/www.scientific.net/amr.629.623.

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In this work some theoretical aspects of constitutive equations for thixotropic fluids and restrictions on their functional forms are formally discussed. In the current study a formal emphasis has been given to the structural nature of this substances. The behavior of thixotropic fluids is analyzed in terms of simple isothermal laminar shear flow.

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Fu, Chunquan, Hongliang Zhou, Hongjun Yin, Huiying Zhong, and Haimei Jiang. "Flow behavior of UCM viscoelastic fluid in sudden contraction channel." Natural Science 02, no. 07 (2010): 780–85. http://dx.doi.org/10.4236/ns.2010.27098.

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Nagashima, Masayuki, Tomiichi Hasegawa, and Takatsune Narumi. "Flow Behavior of Herschel-Bulkley Fluid in a Slot Die." Nihon Reoroji Gakkaishi 34, no. 4 (2006): 213–21. http://dx.doi.org/10.1678/rheology.34.213.

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30

Wibisono, Y., Y. Migunani, Darmanto, and M. A. Choiron. "Computational fluid dynamics analysis of mini membrane module flow behavior." IOP Conference Series: Earth and Environmental Science 475 (May 7, 2020): 012009. http://dx.doi.org/10.1088/1755-1315/475/1/012009.

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Chen, Dilin, Jie Li, Haiwen Chen, Lai Zhang, Hongna Zhang, and Yu Ma. "Electroosmotic Flow Behavior of Viscoelastic LPTT Fluid in a Microchannel." Micromachines 10, no. 12 (December 15, 2019): 881. http://dx.doi.org/10.3390/mi10120881.

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In many research works, the fluid medium in electroosmosis is considered to be a Newtonian fluid, while the polymer solutions and biological fluids used in biomedical fields mostly belong to the non-Newtonian category. Based on the finite volume method (FVM), the electroosmotic flow (EOF) of viscoelastic fluids in near-neutral (pH = 7.5) solution considering four ions (K+, Cl−, H+, OH−) is numerically studied, as well as the viscoelastic fluids’ flow characteristics in a microchannel described by the Linear Phan-Thien–Tanner (LPTT) constitutive model under different conditions, including the electrical double layer (EDL) thickness, the Weissenberg number (Wi), the viscosity ratio and the polymer extensibility parameters. When the EDL does not overlap, the velocity profiles for both Newtonian and viscoelastic fluids are plug-like and increase sharply near the charged wall. Compared with Newtonian fluid at Wi = 3, the viscoelastic fluid velocity increases by 5 times and 9 times, respectively, under the EDL conditions of kH = 15 and kH = 250, indicating the shear thinning behavior of LPTT fluid. Shear stress obviously depends on the viscosity ratio and different Wi number conditions. The EOF is also enhanced by the increase (decrease) in polymer extensibility parameters (viscosity ratio). When the extensibility parameters are large, the contribution to velocity is gradually weakened.

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32

Kato, Toru, Masashi Hara, Akifumi Muto, Sei Hiraki, and Masayuki Kawamoto. "Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting." ISIJ International 47, no. 6 (2007): 840–46. http://dx.doi.org/10.2355/isijinternational.47.840.

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Yang, Yahan. "Behavior of Solutions of Model Equations for Incompressible Fluid Flow." Journal of Differential Equations 125, no. 1 (February 1996): 133–53. http://dx.doi.org/10.1006/jdeq.1996.0027.

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Oka, H., and J. Iwata. "Fundamental Behavior of Micro Gas Flow Sensor Using Magnetic Fluid." IEEE Translation Journal on Magnetics in Japan 2, no. 6 (June 1987): 563–65. http://dx.doi.org/10.1109/tjmj.1987.4549530.

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Yamaguchi, Hiroshi, Akira Takushima, and Kumiko Ito. "Flow behavior of viscoelastic fluid at the two-dimensional elbow." Proceedings of the Fluids engineering conference 2004 (2004): 59. http://dx.doi.org/10.1299/jsmefed.2004.59.

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Vieira, Sheila L., Luiz B. Pompeo Neto, and Antonio Celso F. Arruda. "Transient behavior of an electrorheological fluid in shear flow mode." Journal of Rheology 44, no. 5 (September 2000): 1139–49. http://dx.doi.org/10.1122/1.1289282.

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Naoi, Yosuke, Katsumi Aoki, and Hiromu Hashimoto. "1204 Fluid Dynamics Behavior and Flow Visualization for Transporting Films." Proceedings of the Conference on Information, Intelligence and Precision Equipment : IIP 2007 (2007): 114–18. http://dx.doi.org/10.1299/jsmeiip.2007.114.

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Yoo, Young So, Jaeho Shin, Insoo Seo, Juhyeon Kim, Ju Hee Lee, and Sang Hwan Lee. "Bending Behavior of a Carbon Nanotube with Internal Fluid Flow." Fullerenes, Nanotubes and Carbon Nanostructures 23, no. 5 (September 25, 2014): 431–36. http://dx.doi.org/10.1080/1536383x.2013.833912.

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Kim, Kiseok, and Roman Y. Makhnenko. "Coupling Between Poromechanical Behavior and Fluid Flow in Tight Rock." Transport in Porous Media 135, no. 2 (October 6, 2020): 487–512. http://dx.doi.org/10.1007/s11242-020-01484-z.

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Pažanin, Igor. "Asymptotic Behavior of Micropolar Fluid Flow Through a Curved Pipe." Acta Applicandae Mathematicae 116, no. 1 (July 22, 2011): 1–25. http://dx.doi.org/10.1007/s10440-011-9625-7.

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Gong, Xinglong, Qian Chen, Mei Liu, Saisai Cao, Shouhu Xuan, and Wanquan Jiang. "Squeeze flow behavior of shear thickening fluid under constant volume." Smart Materials and Structures 26, no. 6 (May 16, 2017): 065017. http://dx.doi.org/10.1088/1361-665x/aa6ef0.

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Suh, J. K., and M. R. DiSilvestro. "Biphasic Poroviscoelastic Behavior of Hydrated Biological Soft Tissue." Journal of Applied Mechanics 66, no. 2 (June 1, 1999): 528–35. http://dx.doi.org/10.1115/1.2791079.

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Hydrated biological soft tissue consists of a porous extracellular matrix (ECM) and an interstitial fluid. The poroelastic theory (Biot, 1962), which was originally developed for soil mechanics, has been widely used for mathematical modeling of such hydrated biological tissue. This theory assumes that the ECM is incompressible and purely elastic, and that the interstitial fluid is incompressible and inviscid. The overall viscoelasticity of the tissue is expressed as a result of the frictional interaction between the elastic porous matrix and the interstitial fluid. The poroelastic theory, also known as the biphasic theory (Mow et al., 1980) in the biomechanics field, has served well over the past 20 years as an excellent modeling tool for the interstitial fluid flow-dependent viscoelastic response of hydrated soft tissue. It has been demonstrated that hydrated soft tissue also possesses a significant intrinsic viscoelasticity, independent of the interstitial fluid flow. The biphasic poroviscoelastic (BPVE) theory, which was first introduced by Mak (1986a and 1986b), incorporates a viscoelastic relaxation function into the effective solid stress of the poroelastic theory thus accounting for both intrinsic fluid flow-independent and fluid flow-dependent viscoelasticity. The objective of the present study is to investigate the biphasic poroviscoelastic characteristics of hydrated soft tissue, with an emphasis on the relative contribution of fluid flow-dependent and fluid flow-independent viscoelasticity to the overall viscoelastic behavior of soft tissues.

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Sun, Baojiang, Yanli Guo, Wenchao Sun, Yonghai Gao, Hao Li, Zhiyuan Wang, and Hongkun Zhang. "Multiphase flow behavior for acid-gas mixture and drilling fluid flow in vertical wellbore." Journal of Petroleum Science and Engineering 165 (June 2018): 388–96. http://dx.doi.org/10.1016/j.petrol.2018.02.016.

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Lelea, Dorin, Adrian Cioabla, Ioan Laza, and Liviu Mihon. "The Nu Number Behavior on Micro-tube Heat Transfer and Fluid Flow of Dielectric Fluid." Open Thermodynamics Journal 3, no. 1 (November 23, 2009): 38–41. http://dx.doi.org/10.2174/1874396x00903010038.

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KATO, Manabu, and Tsutomu TAKAHASHI. "S051011 Molecular orientation and flow behavior of viscoelastic fluid in planer elongational flow of Core/Sheath flow." Proceedings of Mechanical Engineering Congress, Japan 2013 (2013): _S051011–1—_S051011–3. http://dx.doi.org/10.1299/jsmemecj.2013._s051011-1.

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Guo, Li Ping, and Lei Wang. "Study on the Flow Behavior of Underbalanced Circulative Micro-Foam Drilling Fluid." Advanced Materials Research 706-708 (June 2013): 1585–88. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1585.

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Underbalanced drilling is a new method for the exploratory development of low pressure and permeability reservoirs; circulative micro-foam drilling fluid is a new technology which is developed for realizing near-balanced drilling and underbalanced drilling. The flow behavior of circulative micro-foam drilling fluid in wellbore was researched by applying HPHT experiment apparatus. It is concluded that the flow behavior parameters of circulative micro-foam drilling fluid is only related to temperature but not to pressure; the constitutive equation accords with the rheological law of power-law fluid, the expressions of consistency coefficient and liquidity index were obtained through analyzing the flow behavior experiment data under the condition of HTHP. The density of circulative micro-foam drilling fluid increases as the increase of pressure and decreases as the increase of temperature, but in wellbore the rate of increase as pressure is greater than that of decrease as temperature, so the density of drilling fluid in wellbore is greater than that under ground condition. The fluid drag force of micro-foam drilling fluid in annulus were analyzed theoretically and the pressure distribution formulas of micro-foam drilling fluid in wellbore were given.

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Malyshev, V. L., K. V. Moiseyev, and E. F. Moiseeva. "Regimes of fluid flow in mixed convection." Proceedings of the Mavlyutov Institute of Mechanics 8, no. 1 (2011): 124–32. http://dx.doi.org/10.21662/uim2011.1.011.

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In this paper the behavior of the solution of the system of equations of thermal convection in a rectangular region is considered. For natural convection, characteristic numbers are found at which oscillatory regimes arise. Various ratios of the length and height of the cavity are considered. The effect of mixed convection on the nature of the fluid flow is estimated.

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STANLEY, H. E., A. D. ARAÚJO, U. M. S. COSTA, and J. S. ANDRADE. "FLUID FLOW THROUGH DISORDERED POROUS MEDIA." Fractals 11, supp01 (February 2003): 301–12. http://dx.doi.org/10.1142/s0218348x03001963.

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This talk briefly reviews the subject of fluid flow through disordered media. First, we use two-dimensional percolation networks as a simple model for porous media to investigate the dynamics of viscous penetration when the ratio between the viscosities of displaced and injected fluids is very large. The results indicate the possibility that viscous displacement through critical percolation networks constitutes a single universality class, independent of the viscosity ratio. We also focus on the sorts of considerations that may be necessary to move statistical physics from the description of idealized flows in the limit of zero Reynolds number to more realistic flows of real fluids moving at a nonzero velocity, when inertia effects may become relevant. We discuss several intriguing features, such as the surprisingly change in behavior from a "localized" to a "delocalized" flow structure (distribution of flow velocities) that seems to occur at a critical value of Re which is significantly smaller than the critical value of Re where turbulence sets in.

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ONODY, R. N. "FLUID FLOW IN A DIRECTED POROUS MEDIA." International Journal of Modern Physics C 06, no. 01 (February 1995): 77–83. http://dx.doi.org/10.1142/s0129183195000071.

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We present a modified site invasion percolation with a biased growth rule to model a fluid flow in porous media with a privileged direction. The effects of the modifications are systematically analyzed in computer simulations and a number of characteristics parameters such as acceptance profiles and linear mass density are obtained. The asymptotic behavior and scaling relations are also discussed and the associated exponents are numerically estimated.

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CHO, SU K., and VAMSHI M. KORIVI. "PORT DESIGN OPTIMIZATION USING CFD ANALYSIS." Journal of Advanced Manufacturing Systems 03, no. 01 (June 2004): 21–32. http://dx.doi.org/10.1142/s0219686704000375.

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Shape of ports that are part of an engine cylinder head is vital to engine performance and emissions. The advance of CFD (Computation Fluid Dynamics) analysis technology helps designers run the simulation to improve the port design and to provide the better model for a flow bench test. This paper presents the automation of design optimization process integrating CAD modeling, mesh generation and CFD simulation.

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