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Academic literature on the topic 'Impinging Sheet'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Impinging Sheet"

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Ibrahim, E. A., and B. E. Outland. "A non-linear model for impinging jets atomization." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 2 (February 1, 2008): 213–24. http://dx.doi.org/10.1243/09544062jmes710.

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The problem considered is predicting the characteristics of the spray produced by atomization of an attenuating liquid sheet formed by the impingement of two liquid jets of equal diameters and momenta. A second-order non-linear perturbation analysis is employed to model the evolution of harmonic instability waves that lead to sheet distortion and fragmentation. The onset of atomization occurs when the uneven surface modulations of the thinning sheet bring its upper and lower interfaces in contact. It is found that the sheet is torn into ligaments at each half wavelength. The instability of the ligaments causes their eventual disintegration into drops. The results indicate that sheet breakup length, time, and resultant drop size decrease as Weber number is increased. A higher Weber number induces a greater sheet breakup thickness. The breakup length, thickness, time, and drop size are diminished at larger impingement angles. The theoretical predictions of the present non-linear model are in good agreement with available experimental data and empirical correlations for sheet breakup length and drop size.
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Beck, J. E., Arthur H. Lefebvre, and T. R. Koblish. "LIQUID SHEET DISINTEGRATION BY IMPINGING AIR STREAMS." Atomization and Sprays 1, no. 2 (1991): 155–70. http://dx.doi.org/10.1615/atomizspr.v1.i2.20.

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Wang, En Dong, Yan Yin, and Qing Du. "Study on some Aspects of Breakup Characteristics of Power-Law Fluid with Impinging Jets Based on Mechanics Properties." Advanced Materials Research 625 (December 2012): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amr.625.57.

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Shear-thinning power-law fluid is a kind of non-Newtonian fluid in which the viscosity is a function of shear rate. Impinging jets system is used to study the breakup characteristics of power-law liquid sheets formed by two symmetrical round jets in this study. High quality images are obtained from the experiment with a high speed camera and breakup length is extracted from the images. Closed-rim sheet, web-like sheet and ligaments sheet are observed with the increase of jet velocity. A series of images show that the wave length on the surface of sheets tends to decline as the jet velocity increases. At a low We number, the breakup length increases with an increasing We number. However, it first increases and then decreases when the liquid sheet breaks up at a high We number. The liquid jets with larger diameter collide to each other and lead to a liquid sheet with a smaller breakup length.
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Kim, Hyuntak, Hongjae Kang, and Sejin Kwon. "Liquid Sheet–Sheet Impinging Structure for Pintle Injector with Nontoxic Hypergolic Bipropellant." Journal of Propulsion and Power 36, no. 2 (March 2020): 302–7. http://dx.doi.org/10.2514/1.b37645.

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Xia, Yakang, Lyes Khezzar, Shrinivas Bojanampati, and Arman Molki. "Breakup of the Water Sheet Formed by Two Liquid Impinging Jets." International Journal of Chemical Engineering 2019 (February 3, 2019): 1–8. http://dx.doi.org/10.1155/2019/9514848.

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Flow visualization experiments are carried out to study the flow regimes and breakup length of the water sheet generated by two impinging liquid jets from an atomizer made of two identical tubes 0.686 mm in diameter. These experiments cover liquid jet Reynolds numbers based on the pipe diameter in the range of 1541 to 5394. The effects of the jet velocities and impingement angle between the two jets on the breakup performance are studied. Four spray patterns are recognized, which are presheet formation, smooth sheet, ruffled sheet, and open-rim sheet regimes. Water sheet breakup length is found to be consistent with previous experimental and theoretical results in the lower Weber number (based on water jet diameter and velocity) range. In the relatively high Weber number range, the breakup length tends to a constant value with increasing Weber number, and some discrepancies between experimental and theoretical predictions do exist. Measured water sheet area increases with increasing liquid jet Reynolds numbers and impingement angle within the range of the current study.
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Honda, H., S. Nozu, and Y. Takeda. "A Theoretical Model of Film Condensation in a Bundle of Horizontal Low Finned Tubes." Journal of Heat Transfer 111, no. 2 (May 1, 1989): 525–32. http://dx.doi.org/10.1115/1.3250709.

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The previous theoretical model of film condensation on a single horizontal low finned tube is extended to include the effect of condensate inundation. Based on the flow characteristics of condensate on a vertical column of horizontal low finned tubes, two major flow modes, the column mode and the sheet mode, are considered. In the column mode, the surface of the lower tubes is divided into the portion under the condensate column where the condensate flow is affected by the impinging condensate from the upper tubes, and the portion between the condensate columns where the condensate flow is not affected by the impinging condensate. In the sheet mode, the whole tube surface is assumed to be affected by the impinging condensate. Sample calculations for practical conditions show that the effects of the fin spacing and the number of vertical tube rows on the heat transfer performance is significant for R-12, while the effects are small for steam. The predicted value of the heat transfer coefficient for each tube row compares well with available experimental data, including four fluids and five tube bundles.
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Dollar, Anna, and Paul S. Steif. "A Tension Crack Impinging Upon Frictional Interfaces." Journal of Applied Mechanics 56, no. 2 (June 1, 1989): 291–98. http://dx.doi.org/10.1115/1.3176081.

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A crack impinging normally upon a frictional interface is studied theoretically. We employ a solution technique which superposes the solution of a crack in a perfectly-bonded elastic medium with a continuous distribution of dislocations which represent slippage at the frictional interface. This procedure reduces the problem to a singular integral equation which is solved numerically. Specifically, we consider the problem of an infinite sheet subjected to uniaxial tension containing a finite crack which lies normal to the tension axis and has both crack tips impinging normally on frictional interfaces. The limiting problem of a semi-infinite crack impinging on a frictional interface is considered as well. Posed as model problems for cracking in weakly bonded fiber composites, these studies reveal the effective blunting that can result when a weak interface serves to deflect a propagating crack.
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Wang, Zhi-liang, S. P. Lin, and Zhe-wei Zhou. "Formation of radially expanding liquid sheet by impinging two round jets." Applied Mathematics and Mechanics 31, no. 8 (July 24, 2010): 937–46. http://dx.doi.org/10.1007/s10483-010-1328-x.

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Weidman, Patrick. "Axisymmetric rotational stagnation point flow impinging on a radially stretching sheet." International Journal of Non-Linear Mechanics 82 (June 2016): 1–5. http://dx.doi.org/10.1016/j.ijnonlinmec.2016.01.016.

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Mabood, F., and W. A. Khan. "Analytical study for unsteady nanofluid MHD Flow impinging on heated stretching sheet." Journal of Molecular Liquids 219 (July 2016): 216–23. http://dx.doi.org/10.1016/j.molliq.2016.02.071.

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Dissertations / Theses on the topic "Impinging Sheet"

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Jian, Shi–Kai, and 簡士凱. "Characteristic study on a liquid sheet formed by two impinging jets generated by micro-nozzle." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/97958170717019194095.

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碩士
國立臺灣大學
機械工程學研究所
92
In this article an experimental study is presented by a liquid sheet formed by two impinging jets at l atm/20~25oC. We use water as the test liquid to experiment a liquid sheet formed by two impinging jets by four different sizes--- 0.022mm, 0.035mm, 0.047mm, 0.063mm. We find that some results of the experiment distinguish from those of the previous researches. Besides, we discuss the relationship about the shapes of a liquid sheet formed by two impinging jets by changing the shedding angle, size, velocity. Since we discover a tendency from the relationship, we talk about the outcome presented by dimensionless analysis. At last, we calculate the most erroneous degree of accuracy in our experiment.
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Book chapters on the topic "Impinging Sheet"

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Hagihara, Yoshiyuki, Yasuyuki Yamamoto, Masaaki Numata, and Taizo Matsuda. "Development of Impinging Jet Burner Using Ammonia Fuel for Degreasing Steel Sheets." In CO2 Free Ammonia as an Energy Carrier, 641–51. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4767-4_45.

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"Investigation of Heat Transfer of a Square Impinging Air Jet on a Flat Surface using Thermochromic Liquid Crystal Sheet." In Materials in Environmental Engineering, 1385–94. De Gruyter, 2017. http://dx.doi.org/10.1515/9783110516623-136.

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Conference papers on the topic "Impinging Sheet"

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Kashanj, Sina, and Azadeh Kebriaee. "Video: Liquid sheet of two impinging jets." In 73th Annual Meeting of the APS Division of Fluid Dynamics. American Physical Society, 2020. http://dx.doi.org/10.1103/aps.dfd.2020.gfm.v0028.

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Shang, Weixiao, and Jun Chen. "Dynamic Measurement of Liquid Sheet Formed by Impinging Jets via Partial Coherent Interferometry." In ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83465.

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In this work, the thicknesses of impinging liquid sheets formed by two alike impinging jets with different flow rates are investigated via a non-intrusive measurement technique, the Partial Coherent Interferometry. The Reynolds number and Weber number are 720 to 780 and 120 to 150, respectively. An interferometer with the calibrated partial coherence property is used to record the interference pattern by passing one branch of the two optical paths through the impinging sheet. By examining the phase and the degree of coherence of the pattern, the absolute thickness distribution of the impinging sheet is measured. The thicknesses with different experimental conditions are compared to the previous theoretical models and the influences of the flow rate and impinging angle are concluded.
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Shang, Weixiao, and Jun Chen. "The Dynamic Measurement of Impinging Sheet Thickness via Partial Coherent Interferometry." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5464.

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Abstract In this work, the thicknesses of a series of impinging sheets formed by two ethanol jets under different jet velocities are measured and compared with the theoretical model via a non-intrusive technique, the partial coherent interferometry. An interferometer with the calibrated partial coherence property is used to record the interference pattern by passing one optical path through the impinging sheet. The thickness is measured by analyzing the change of degree of coherence before and after the sheet insertion. The Reynolds numbers and Weber numbers of this experiment range from 269 to 370 and 35 to 67, respectively. The experimental results show that the jet velocity controls the size of the sheet but not affects the thickness distribution. The measured thicknesses are different from the theoretical predictions and indicate that the velocity inside the sheet may not be a constant along the radial direction.
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Kebriaee, Azadeh, Hamed Dolatkhahi, and Ghader Oliaee. "Numerical Simulation of Like and Unlike Impinging Jets." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4865.

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In the present study, using the open source OpenFOAM code, a numerical simulation is performed taking the adaptive mesh refinement (AMR) technique during solution. Formation of liquid sheet after the impact of two identical cylindrical jets at various conditions is studied. Since the flow pattern depends upon the Reynolds and Weber numbers, numerical tests are conducted at a variety of flow velocities and Reynolds numbers to demonstrate the effect of these parameters on the sheet formation. It is then concluded that at various conditions, different instabilities occur in the flow; hence, different sheet formations a flow patterns happen.In this study, impact of two dissimilar cylindrical fluid jets is successfully simulated for the first time in literature. Actually, water and oil jets are taken into account and their impact behavior is studied. In the presence of the surrounding air, an unstable sheet will form after impact due to the high injection speed of the jets. As depicted in the results, since the inertia and other physical characteristics of the two fluids are dissimilar, different phases are more intensely diffused.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4865
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Rodrigues, Neil S., and Paul E. Sojka. "Spatially Resolved Gelled Propellant Spray Characteristics of Impinging Jets." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51465.

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The spatially resolved spray characteristics created by the like-on-like impingement of two gelled propellant simulants was experimentally investigated using Phase Doppler Anemometry (PDA). Water based gels of 1.0 wt.-% agar and 1.0 wt.-% kappa carrageenan, which were characterized using the Herschel-Bulkley rheological model, were used as the gel propellant simulants. Spatially resolved measurements for drop size and drop velocity were obtained up to 10 mm away from the centerline along the transverse axis in the plane of the sheet and up to 20 mm away from the centerline along the transverse axis in the plane normal to the sheet. All measurements were obtained at an axial plane 5 cm downstream of the impingement point. Larger D10 and D32 mean diameters and lower mean axial drop velocity Uz-mean were observed for transverse distances away from the centerline of the spray along both the axis in the plane of the sheet and in the plane normal to the sheet.
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Ling, Yue, Weixiao Shang, and Jun Chen. "Detailed Numerical Simulation of Two Impinging Jets With Moderate Injection Velocities." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5221.

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Abstract Impinging-jet injectors are commonly used in liquid propellant rocket engines. Two cylindrical liquid jets impinge at a certain angle and form a liquid sheet in the plane normal to the jets. When the Reynolds and Weber numbers are large, the liquid sheet becomes unstable and disintegrates into liquid ligaments and droplets. In the present study, we focus on cases with moderate injection velocities so that the liquid sheet remains unbroken. Detailed numerical simulations are performed using the adaptive multiphase flow solver, Basilisk. The volume-of-fluid method is used to resolve the gas-liquid interface. Grid-refinement studies are conducted to verify the formation of the liquid sheet is accurately captured in simulation. The numerical results are compared to the recent experimental measurement of the sheet thickness distribution by partial coherent interferometry and a good agreement is achieved.
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Inoue, Chihiro, Toshinori Watanabe, and Takehiro Himeno. "Study on Atomization Process of Liquid Sheet Formed by Impinging Jets." In 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4847.

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KLINE, M., R. WOODWARD, R. BURCH, F. CHEUNG, and K. KUO. "Experimental observation of impinging jet breakup utilizing laser-sheet illuminated photography." In Conference on Advanced SEI Technologies. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-3596.

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Costa, Mário, Bruno Pizziol, Miguel Panao, and André Silva. "Multiple Impinging Jet Air-Assisted Atomization." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.4737.

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The growth of the aviation sector triggered the search for alternative fuels and continued improvements in thecombustion process. This work addresses the technological challenges associated with spray systems and theconcern of mixing biofuels with fossil fuels to produce alternative and more ecological fuels for aviation. This workproposes a new injector design based on sprays produced from the simultaneous impact of multiple jets, using anadditional jet of air to assist the atomization process. The results evidence the ability to control the average dropsize through the air-mass flow rate. Depending on the air-mass flow rate there is a transition between atomizationby hydrodynamic breakup of the liquid sheet formed on the impact point, to an aerodynamic breakup mechanism,as found in the atomization of inclined jets under cross-flow conditions. The aerodynamic shear breakupdeteriorates the atomization performance, but within the same order of magnitude. Finally, our experiments showthat mixing a biofuel with a fossil fuel does not significantly alter the spray characteristics, regarded as a stepfurther in developing alternative and more ecological fuels for aero-engines.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4737
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Heislbetz, Bernhard, Klaus Madlener, and Helmut Ciezki. "Breakup Characteristics of a Newtonian Liquid Sheet Formed by a Doublet Impinging Jet Injector." In 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-5694.

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