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Journal articles on the topic 'Dual concentric injector'

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Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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Vásquez, R. A., and F. S. Costa. "SPRAY CONE ANGLES GENERATED BY A DUAL CENTRIFUGAL INJECTOR." Revista de Engenharia Térmica 13, no. 1 (June 30, 2014): 36. http://dx.doi.org/10.5380/reterm.v13i1.62067.

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A dual pressure swirl injector is characterized by two independent concentric chambers which can provide independent rotational levels to a single liquid or two different liquids. This paper compares theoretical, semi-empirical and experimental results concerning the spray cone angles formed by injection of water, ethanol and biodiesel through a dual pressure swirl injector. Data are obtained for injection of the same liquid through the primary and secondary chambers and for injection of ethanol in the primary chamber and biodiesel through the secondary chamber of the injector. Experimental data are obtained using photographic techniques and are analyzed by an image processing software developed in Matlab language.

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Douglas, David N., Amy J. Managh, Helen J. Reid, and Barry L. Sharp. "High-Speed, Integrated Ablation Cell and Dual Concentric Injector Plasma Torch for Laser Ablation-Inductively Coupled Plasma Mass Spectrometry." Analytical Chemistry 87, no. 22 (October 28, 2015): 11285–94. http://dx.doi.org/10.1021/acs.analchem.5b02466.

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Liu, Hong Qin, Zai Hong Shi, Jing Zhu, and Zhen Ma. "Optimized Design and Research on Technology Parameters of Concentric Dual-Tube Steam Injection Horizontal Well." Applied Mechanics and Materials 675-677 (October 2014): 1505–11. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.1505.

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The screen pipe completion is the predominated method for heavy oil horizontal well in Liaohe Oilfield, accounting for 83.4% of the total completions. General steam injection has been used for the horizontal wells, resulting in a better exploitation percentage in heel part but a poorer exploitation percentage beyond 1/3 of the distance from the tiptoe to heel in horizontal well. As the concentric dual-tube steam injection technique for horizontal well has just been developed in Liaohe Oilfield, the related supporting technique is not enough. In this paper, researchers consider achieving horizontal wells concentric dual-tube steam injection optimized design as main goal so that the physical model will be established, and also the calculation methods for pressure, the calculation models for quality, heat loss and tapered string parameters along the wellbore will be provided during the concentric dual-tube steam injection for horizontal wells.

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Sun, Fengrui, Yuedong Yao, Guozhen Li, and Xiangfang Li. "Numerical Simulation of Supercritical-Water Flow in Concentric-Dual-Tubing Wells." SPE Journal 23, no. 06 (August 25, 2018): 2188–201. http://dx.doi.org/10.2118/191363-pa.

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Summary Much work has been performed on the modeling of saturated/superheated-steam flow in wellbores. At present, the study on supercritical-water (SCW) flow in wellbores, especially concentric-dual-tubing wells (CDTWs), is very limited. In this paper, work was performed on modeling of SCW flow in CDTWs. First, a comprehensive mathematical model comprising a pipe-flow model, supercritical-fluid model, and heat-transfer model is established. In the model, the heat exchange between the integral joint tubing (IJT) and annuli is taken into consideration. Numerical solutions of SCW flow in CDTWs were obtained with a straightforward numerical method. Then, sensitivity analysis was conducted. The following results were found: SCW in annuli (with a higher temperature) releases thermal energy to SCW in the IJT, which causes increase of temperature in IJT. As a result, SCW density in the IJT has a decrease. The density gradient near the wellhead increases with increasing of injection rate. When the injection temperature in the IJT is larger than that in annuli, SCW density increases with well depth near the wellhead.

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Zhang, Yi, Jiexiang Wang, Peng Jia, Xiao Liu, Xuxu Zhang, Chang Liu, and Xiangwei Bai. "Viscosity Loss and Hydraulic Pressure Drop on Multilayer Separate Polymer Injection in Concentric Dual-Tubing." Energies 13, no. 7 (April 2, 2020): 1637. http://dx.doi.org/10.3390/en13071637.

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Multilayer separate polymer injection in concentric dual-tubing is a special method for enhancing oil recovery in later development stage of the multilayer formation. During the injection process, heat exchange occurs among the inner tubing, tubing annulus and formation, making the thermal transfer process more complicated than traditional one. This work focuses on the polymer flowing characteristics during the multilayer separate polymer flooding injection process in the wellbore. A temperature–viscosity numerical model is derived to investigate the influencing factors on polymer dual-tubing injection process. Then, an estimate-correct method is introduced to derive the numerical solutions. Several influences have been discussed, including the axial temperature distribution, viscosity distribution, pressure drop, and flow pattern of polymer. Results show that under low injecting rates, below 5 m3/d, formation temperature will greatly decrease the polymer viscosity. When the injecting rates above 20 m3/d, the polymer just decreases 1–3 mPa·s at the bottom of well, which is really small. Additionally, the temperature distribution, the coefficient of friction under different injecting rates have been discussed. Generally, this method provides a new way to analyze thermal conductivity during the polymer injection process which is meaningful for polymer flooding in the oilfield application.

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Jiaming Zhang, Xiaodong Wu, Jingyao Wang, Shuai Xing, and Zhuang Zhang. "A New Wellbore Flow Model of CO2 Separate Injection with Concentric Dual Tubes." International Journal of Advancements in Computing Technology 4, no. 23 (December 31, 2012): 258–65. http://dx.doi.org/10.4156/ijact.vol4.issue23.31.

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Hunt, S. W., C. S. Brauer, M. B. Craddock, K. J. Higgins, A. M. Nienow, and K. R. Leopold. "Microwave observation of H3N–SO3⋯H2O using a concentric, dual-injection nozzle source." Chemical Physics 305, no. 1-3 (October 2004): 155–64. http://dx.doi.org/10.1016/j.chemphys.2004.06.040.

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Ma, Chuan, Xiaoyan Liu, Haiqian Zhao, and Guangfu Cui. "Influence of Vertical Downward Annulus Eccentricity on Steam-Water Two-Phase Flow Pressure Drop." Mathematical Problems in Engineering 2022 (April 7, 2022): 1–12. http://dx.doi.org/10.1155/2022/7682520.

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Concentric dual-tubing steam injection technique is one of the main methods to improve heavy oil recovery efficiency. From field data, it was discovered that hot fluid at high temperature and pressure caused steam injection casing to have elongation strain and “necking” eccentric buckling, and the eccentricity change affected the accurate prediction of steam-water two-phase flow pressure drop in the steam injection casing. This paper established a coupling model for the steam-water two-phase flow pressure drop in vertical downward eccentric annulus and the wellbore heat transfer and developed a mathematical model calculation program, to validate the accuracy of calculating the liquid holdup and pressure gradient of fully eccentric annulus. This revealed the influential law of eccentricity on the annulus steam-water two-phase pressure, dryness, and enthalpy value. The results indicated that when the eccentricity e increased from 0 to 1, the saturation pressure of steam at annulus wellbore bottom increased by 0.265 MPa, and the dryness and enthalpy value decreased by 8.54 × 10−3 and 11.22 kJ kg−1, respectively. Compared to the concentric layout, the eccentrically arranged steam injection inner tube cannot promote the wet steam dryness at annulus wellbore bottom.

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Eufrásio-da-Silva, Tatiane, Eduardo Ruiz-Hernandez, Joanne O’Dwyer, Dolores Picazo-Frutos, Garry P. Duffy, and Bruce P. Murphy. "Enhancing medial layer recellularization of tissue-engineered blood vessels using radial microchannels." Regenerative Medicine 14, no. 11 (November 2019): 1013–28. http://dx.doi.org/10.2217/rme-2019-0011.

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Aim: Cell repopulation of tissue-engineered vascular grafts (TEVGs) from decellularized arterial scaffolds is limited by dense concentric tunica media layers which impede cells migrating radially between the layers. We aimed to develop and validate a new microneedle device to modify decellularized carotid arteries with radial microchannels to enhance medial layer repopulation. Material & methods: Modified decellularized porcine arteries were seeded with rat mesenchymal stem cells using either standard longitudinal injection, or a dual vacuum-perfusion bioreactor. Mechanical tests were used to assess the arterial integrity following modification. Results & conclusion: The method herein achieved radial recellularization of arteries in vitro without significant loss of mechanical integrity, Thus, we report a novel method for successful radial repopulation of decellularized carotid artery-based tissue-engineered vascular grafts.

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Gu, Hao, Linsong Cheng, Shijun Huang, Baojian Du, and Changhao Hu. "Prediction of thermophysical properties of saturated steam and wellbore heat losses in concentric dual-tubing steam injection wells." Energy 75 (October 2014): 419–29. http://dx.doi.org/10.1016/j.energy.2014.07.091.

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Wu, Jiandong, Jiyun Xu, and Hao Wang. "Numerical simulation of micron and submicron droplets in jet impinging." Advances in Mechanical Engineering 10, no. 10 (October 2018): 168781401880531. http://dx.doi.org/10.1177/1687814018805319.

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Micron droplet deposition onto a wall in an impinging jet is important for various applications like spray cooling, coating, fuel injection, and erosion. The impinging process is featured by abrupt velocity changes and thus complicated behaviors of the droplets. Either modeling or experiment for the droplet behaviors is still challenging. This study conducted numerical modeling and compared with an existing experiment in which concentric dual-ring deposition patterns of micron droplets were observed on the impinging plate. The modeling fully took into account of the droplet motion in the turbulent flow, the collision between the droplets and the plate, as well as the collision, that is, agglomeration among droplets. Different turbulence models, that is, the v2− f model, standard k–ε model, and Reynolds stress model, were compared. The results show that the k–ε model failed to capture the turbulent flow structures and overpredicted the turbulent fluctuations near the wall. Reynolds stress model had a good performance in flow field simulation but still failed to reproduce the dual-ring deposition pattern. Only the v2− f model reproduced the dual-ring pattern when coupled with droplet collision models. The results echoed the excellent performance of the v2− f model in the heat transfer calculation for the impinging problems. The agglomeration among droplets has insignificant influence on the deposition.

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Margolis, Ryan, Junjie Li, Lokesh Basavarajappa, and Kenneth Hoyt. "Abstract 2469: Image-guided focused ultrasound-mediated drug delivery for improved cancer treatment." Cancer Research 82, no. 12_Supplement (June 15, 2022): 2469. http://dx.doi.org/10.1158/1538-7445.am2022-2469.

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Abstract Introduction: The first option for cancer treatment is often chemotherapy. However, studies have shown that only 1% of the injected dose reaches the target cancer as the tumor microenvironment presents a physical barrier for optimal drug delivery. Focused ultrasound (FUS) in combination with microbubble (MB) contrast agents is an emerging therapy to improve drug delivery by temporarily increasing microvascular permeability. This research details the development and testing of a novel ultrasound (US) image-guided FUS system and method for enhancing drug delivery to tumor tissue and volume space with comparison to a 2-dimensional (2-D) US therapeutic technology. Methods: Real-time US therapy was implemented on a programmable US system (Vantage 256, Verasonics Inc) equipped with a dual US transducer configuration for interleaved anatomical imaging and volumetric treatment delivery (HIFU-Plex, Sonic Concepts Inc). Both US imaging and therapeutic transducers are co-registered 128 element arrays with center frequencies of 3.5 and 2.0 MHz, respectively. The latter is a concentric array that enables beam steering in 3-dimensional (3-D) space. US treatment was performed at a peak negative pressure of 0.7 MPa (mechanical index, MI of 0.45), pulse repetition frequency of 10 Hz, and duty cycle of 10%. BALB/c mice (N = 22, Charles River Laboratory) were implanted with 2.0 × 105 breast cancer cells (4T1, ATCC). Once tumors reached 0.6 cm in size, mice were randomly divided into a 3-D or 2-D US therapy group or sham control. US therapy was performed following an intravascular injection of microbubbles (Definity, Lantheus Medical Imaging) and IR-780 dye. Note microbubbles function as a therapeutic mediator whereas the fluorescent dye represents a surrogate small molecule drug. Live animal fluorescent imaging was performed at baseline before US therapy (0 h) and again at 1, 24, and 48 h. Following the 48 h timepoint, animals were euthanized and tumors surgically excised for ex vivo analysis. Results: 3-D US-mediated therapy improved molecular delivery to tumor tissue by 150 and 180% at 24 and 48 h, respectively, when compared to our previously established 2-D US therapeutic approach (p = 0.22) or sham therapy (p = 0.07). A similar trend was observed during ex vivo imaging of excised tumor samples treated with 3-D US therapy as compared to the 2-D US therapeutic approach (p = 0.41) or sham therapy (p = 0.04). Dye extraction further confirmed these observations (p > 0.12). Conclusions: 3-D US therapy improved molecular delivery to the tumor volume compared to our previously established 2-D US-based method as confirmed by a series of optical imaging studies. Citation Format: Ryan Margolis, Junjie Li, Lokesh Basavarajappa, Kenneth Hoyt. Image-guided focused ultrasound-mediated drug delivery for improved cancer treatment [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2022; 2022 Apr 8-13. Philadelphia (PA): AACR; Cancer Res 2022;82(12_Suppl):Abstract nr 2469.

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Wang, Ting, Armin K. Silaen, Heng-Wen Hsu, and Cheng-Hsien Shen. "Top Fuel Injection Design in an Entrained-Flow Coal Gasifier Guided by Numerical Simulations." Journal of Thermal Science and Engineering Applications 3, no. 1 (March 1, 2011). http://dx.doi.org/10.1115/1.4003529.

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A computational fluid dynamics scheme is employed to simulate the effects of potential fuel injection techniques on gasification performance. The objective is to help design the top-loaded fuel injection arrangement for an entrained-flow gasifier using coal water slurry as the input feedstock. Two specific arrangements are investigated: (a) coaxial dual jet impingement with slurry coal in the center and oxygen in the outer jet and (b) four jet impingement with two single slurry coal jets and two single oxygen jets. When the heterogeneous finite-rate solid-gas reaction scheme is implemented, it is discovered that the particle collision model cannot be implemented with the heterogeneous gasification scheme in the present computational model. The instantaneous gasification model is later employed to examine the particle collision phenomenon by implementing the particle collision model, in which the coal (consisting of carbon and volatiles) is injected as gas, and the water is injected as droplets. The result of droplet tracks shows that the droplets are not bounced around, as speculated, at the intersection where the jets meet, and majority of the droplets pass through the jet impingement section and hit the wall as in the finite-rate case. This implies that the results of the finite rate are acceptable even though the particle collision model is not implemented. The finite-rate result actually presents a worst-case scenario for predicting wall erosion. The particle tracks for both the two concentric and four separate injection configurations show that the coal particles hit the wall and can accelerate the deterioration of the refractory bricks. The case employing two concentric injections provides better fuel-oxidant mixing and higher heating values than the case using four separate injections.

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Dong, Xiaohu, Huiqing Liu, and Zhangxin Chen. "Mathematical Modeling of Heat Transfer and Pressure Drops in the Single- and Dual-Pipe Horizontal Wells." Journal of Thermal Science and Engineering Applications 9, no. 1 (November 16, 2016). http://dx.doi.org/10.1115/1.4034916.

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In this paper, from the heat transfer mechanisms between perforated horizontal well and formation, the mathematical models for the heat transfer and pressure drops of the horizontal well with different steam injection pipe configurations are developed. All the conventional single-pipe, concentric dual-pipe, and parallel dual-pipe configurations are considered. A correlation is proposed to represent a relationship between the thermophysical properties of the formation and the formation pressure and temperature. Then, using the method of wellbore microcontrol elements and node analysis, the steam injection process in the three different well configurations is numerically investigated. Based on the test data of a parallel dual-pipe horizontal well from an actual oilfield, a steam backflow procedure for the parallel dual-pipe configuration is proposed to confirm the sealed status of a thermal packer. The theoretical investigation plays an important role in the performance evaluation and productivity prediction of horizontal well-based thermal recovery projects. Furthermore, it also sheds some important insights on a steam injection project design with dual-pipe horizontal wells.

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Gu, Hao, Linsong Cheng, Shijun Huang, Shuang Ai, and Shaolei Wei. "Concentric Dual-tubing Steam Injection: A New Model for Predicting Steam Pressure in the Annulus." Journal of Industrial and Intelligent Information 2, no. 4 (2014). http://dx.doi.org/10.12720/jiii.2.4.245-251.

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