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Journal articles on the topic 'Duct flows'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Ng’aru, Joseph Mwangi, and Sunho Park. "CFD Simulations of the Effect of Equalizing Duct Configurations on Cavitating Flow around a Propeller." Journal of Marine Science and Engineering 10, no. 12 (2022): 1865. http://dx.doi.org/10.3390/jmse10121865.

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This study presented the results of a computational study of cavitating flows of a marine propeller with energy saving equalizing ducts. The main purpose of the study was to estimate the cavitating flows around a propeller with a duct, and to investigate the interaction between a duct and a propeller in cavitating flows. The INSEAN E779A propeller was used as a baseline model. Validation studies were conducted for non-cavitating and cavitating flows around a hydrofoil and a propeller. A comparison with the experimental data showed good agreement in terms of sheet cavity patterns and propulsion

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2

Ingham, D. B., D. J. Keen, and P. J. Heggs. "Flows in Vertical Channels With Asymmetric Wall Temperatures and Including Situations Where Reverse Flows Occur." Journal of Heat Transfer 110, no. 4a (1988): 910–17. http://dx.doi.org/10.1115/1.3250592.

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Numerical investigations are conducted into steady laminar combined convection flows in vertical parallel plate ducts with asymmetric constant wall temperature boundary conditions. The streamwise diffusion terms in the governing equations are neglected and the resulting parabolic equations are expressed in an implicit finite difference scheme and solved using a marching technique. In certain situations the combination of the size of the ratio |Gr/Re| and the difference in temperature between the walls of the duct is such that the fully developed flow profile, as the streamwise coordinate tends

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3

Franjione, J. G., and J. M. Ottino. "Stretching in duct flows." Physics of Fluids A: Fluid Dynamics 3, no. 11 (1991): 2819–21. http://dx.doi.org/10.1063/1.858171.

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4

Mohiyuddin, Dr S. M. Azeem. "Traumatic Chlye Leak In Neck: An Uncommon and Serious Complication." JOURNAL OF CLINICAL AND BIOMEDICAL SCIENCES 9, no. 2 (2019): 29–30. http://dx.doi.org/10.58739/jcbs/v09i2.4.

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The lymph from the entire left side of body and right side of body below the diaphragm flows through the thoracic duct. The lymph from rest of the body flows through the right thoracic duct. It also carries chyle from intestines, partially digested long chain fatty acids and chylomicrons. The tho-racic duct develops from the fusion of the 2 lymphatic ducts present from the 8th week of intrauterine life and fuse before birth. There can be connections between remnants of the 2 lymphatic ducts or branching from the thoracic duct. The thoracic duct originates from cisterna chyli situated at the le

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5

Karev, O. D. "Introduction to the problem of calculating the parameters of the mixing chamber of an afterburning bypass engine." VESTNIK of Samara University. Aerospace and Mechanical Engineering 20, no. 3 (2021): 57–64. http://dx.doi.org/10.18287/2541-7533-2021-20-3-57-64.

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The article considers the problem of calculation accuracy when using mathematical models of gas-turbine engines of the second level of complexity, using the example of a device for mixing the flows of the core engine and the bypass duct of a gas turbine engine, and suggests methods for solving it. The processes taking place in mixing chambers of air-breather engines are considered to be difficult for mathematical modeling since the exchange of kinetic and thermal energies of the flows characterized by different velocities, pressures, temperatures and chemical composition occurs in them simulta

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6

Kusch, H. A., and J. M. Ottino. "Experiments on mixing in continuous chaotic flows." Journal of Fluid Mechanics 236 (March 1992): 319–48. http://dx.doi.org/10.1017/s0022112092001435.

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We present the design and operation of a flow apparatus for investigations of mixing in time-periodic and spatially periodic chaotic flows. Uses are illustrated in terms of two devices operating in the Stokes regime: the partitioned-pipe mixer, a spatially periodic system consisting of sequences of flows in semicircular ducts, and the eccentric helical annular mixer, a time-periodic velocity field between eccentric cylinders with a superposed Poiseuille flow; other mixing flows can be implemented with relative ease. Fundamental differences between spatially periodic and time-periodic duct flow

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7

Rakul., A. Ravi U. Sathishkumar. "VIBRATION AND NOISE ANALYSIS OF GALVANISED STEEL DUCTS." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 7, no. 5 (2018): 241–45. https://doi.org/10.5281/zenodo.1246961.

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In HVAC (Heating, Ventilating & Air Conditioning) systems, ducts are used to deliver and remove air. Most commonly used material for the ducts are galvanized steel. Thin sheets are used for making various shapes of duct and duct accessories. When air flows through it, noise and vibration occurs in ducts. Applying enough load conditions to the structure of ducts become a failure, and thus increase in noise and vibration inside the duct system occurs. The focus of this paper will be on using ANSYS software to study distribution of air in the ducts, and its noise and vibration. Then after the

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8

Hassan, Abdulkarim A., and Qassim K. Hunaehn. "NUMERICAL STUDY OF INCOMPRESSIBLE FLOW AND HEAT TRANSFER IN NON-CIRCULAR DUCTS WITH CUSP CORNERS." Journal of Engineering 14, no. 02 (2008): 2571–89. http://dx.doi.org/10.31026/j.eng.2008.02.17.

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A numerical finite-volume calculation method was used for application to fully-developed flow and heat transfer in straight ducts with 2-Cusp, 3-Cusp and 4-Cusp cross-sectional area. The method was formulated with reference to a non-orthogonal curvilinear coordinate system which was fitted exactly into duct shape. In turbulent flow, the Reynolds stresses were calculated by using the coupled algebraic stress model of Launder and Ying (1973) with a (k ) transport model. This turbulent stress model enabled secondary flows to be included in the non-circular duct calculations. In heat transfer solu

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9

Ortloff, Charles R. "Supercritical Froude Number Flow through Ducts with Statistically Roughened Walls." Water 15, no. 15 (2023): 2849. http://dx.doi.org/10.3390/w15152849.

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High-speed fluid flows over roughened surfaces occur in many engineering applications; one important application involves high velocity water flows in pipelines with roughened interior walls where the wall roughness affects head loss estimates necessary for engineering design purposes. The present analysis provides an analytical solution of the fluid physics underlying the induced static pressure profile resulting from high Froude number supercritical velocity through duct with random wall roughness. The analytic solution of the hyperbolic governing small perturbation velocity potential equati

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10

Ashrafizadeh, A., G. D. Raithby, and G. D. Stubley. "Direct Design of Ducts." Journal of Fluids Engineering 125, no. 1 (2003): 158–65. http://dx.doi.org/10.1115/1.1514201.

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This paper describes a method for calculating the shape of duct that leads to a prescribed pressure distribution on the duct walls. The proposed design method is computationally inexpensive, robust, and a simple extension of existing computational fluid dynamics methods; it permits the duct shape to be directly calculated by including the coordinates that define the shape of the duct wall as dependent variables in the formulation. This “direct design method” is presented by application to two-dimensional ideal flow in ducts. The same method applies to many problems in thermofluids, including t

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11

Amitay, Michael, Dale Pitt, and Ari Glezer. "Separation Control in Duct Flows." Journal of Aircraft 39, no. 4 (2002): 616–20. http://dx.doi.org/10.2514/2.2973.

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12

Tuladhar, Tri R., William R. Paterson, and D. Ian Wilson. "Dynamic Gauging in Duct Flows." Canadian Journal of Chemical Engineering 81, no. 2 (2008): 279–84. http://dx.doi.org/10.1002/cjce.5450810214.

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13

Cheng, G. C., and S. Farokhi. "On Turbulent Flows Dominated by Curvature Effects." Journal of Fluids Engineering 114, no. 1 (1992): 52–57. http://dx.doi.org/10.1115/1.2909999.

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A technique for improving the numerical predictions of turbulent flows with the effect of streamline curvature is developed. Separated flows and the flow in a curved duct are examples of flow fields where streamline curvature plays a dominant role. New algebraic formulations for the eddy viscosity μt incorporating the k–ε turbulence model are proposed to account for various effects of streamline curvature. The loci of flow reversal (where axial velocities change signs) of the separated flows over various backward-facing steps are employed to test the capability of the proposed turbulence model

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14

Vylegzhanin, N. I. "On the question of primary malignant neoplasms of ductus hepatici." Kazan medical journal 22, no. 7 (2021): 781–84. http://dx.doi.org/10.17816/kazmj79391.

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Among the neoplasms of large extrahepatic bile ducts, cancers occupy the first place in terms of frequency and importance, and the common bile duct, especially its beginning the place where it flows into the duodenum (papilla Vateri), is the most frequent site of cancer localization.

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15

Wang, Liqiu, and Tianliang Yang. "Periodic oscillation in curved duct flows." Physica D: Nonlinear Phenomena 200, no. 3-4 (2005): 296–302. http://dx.doi.org/10.1016/j.physd.2004.11.003.

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16

Zeng-Yuan, Guo, and Bu Wei-Hong. "Thermal drag in forced duct flows." International Journal of Heat and Mass Transfer 34, no. 1 (1991): 229–35. http://dx.doi.org/10.1016/0017-9310(91)90189-l.

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17

Glaister, P. "Real gas flows in a duct." Computers & Mathematics with Applications 24, no. 11 (1992): 45–59. http://dx.doi.org/10.1016/0898-1221(92)90030-l.

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18

Bühler, L., T. Arlt, T. Boeck, et al. "Magnetically induced instabilities in duct flows." IOP Conference Series: Materials Science and Engineering 228 (July 2017): 012003. http://dx.doi.org/10.1088/1757-899x/228/1/012003.

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19

Yao, J., and M. Fairweather. "Particle deposition in turbulent duct flows." Chemical Engineering Science 84 (December 2012): 781–800. http://dx.doi.org/10.1016/j.ces.2012.09.020.

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20

Muzychka, Y. S., and M. M. Yovanovich. "Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular Ducts." Journal of Heat Transfer 126, no. 1 (2004): 54–61. http://dx.doi.org/10.1115/1.1643752.

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A new model for predicting Nusselt numbers in the combined entrance region of non-circular ducts and channels is developed. This model predicts both local and average Nusselt numbers and is valid for both isothermal and isoflux boundary conditions. The model is developed using the asymptotic results for convection from a flat plate, thermally developing flows in non-circular ducts, and fully developed flow in non-circular ducts. Through the use of a novel characteristic length scale, the square root of cross-sectional area, the effect of duct shape on Nusselt number is minimized. Comparisons a

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21

Gao, Jie, Xuezheng Liu, Xudong Zhao, Weiliang Fu, Guoqiang Yue, and Qun Zheng. "Steady and unsteady numerical investigation of flow interaction between low-pressure turbine blade, intermediate turbine duct and power turbine vane." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 23 (2018): 4312–31. http://dx.doi.org/10.1177/0954406217751819.

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Flows in an intermediate turbine duct connecting low-pressure turbines and power turbines are very complex, affected by the upstream low-pressure turbine flow structures. Non-uniformities originating from the duct with struts also affect the power turbine inflow conditions, resulting in reduced efficiency. The present investigation is done to clarify the flow and loss mechanisms within the intermediate turbine duct and the power turbine. Steady and unsteady numerical investigations of the flow interaction between low-pressure turbine blade, intermediate turbine duct and power turbine vane were

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22

Richardson, S. M. "Choking of liquid flows." Journal of Fluid Mechanics 199 (February 1989): 563–68. http://dx.doi.org/10.1017/s0022112089000480.

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It is well-known that laminar flow of a liquid in a duct is predicted to choke if the viscosity of the liquid increases exponentially with increasing pressure. In other words, the pressure drop in the duct is predicted to become unbounded when the volumetric flow rate reaches a critical finite value. Choking is not observed in practice, however: the reason why is investigated here. It is shown that choking is always predicted to occur if the viscosity is independent of temperature or heat generation by viscous dissipation is neglected. If the viscosity decreases exponentially with increasing t

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23

Hamed, A., and S. Abdallah. "Internal Three-Dimensional Viscous Flow Solution Using the Streamlike Function." Journal of Fluids Engineering 108, no. 3 (1986): 348–53. http://dx.doi.org/10.1115/1.3242585.

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This paper presents a new method for the three-dimensional elliptic solution of the Navier–Stokes equations. It is based on the streamlike-function vorticity formulation which was developed by the authors to study the development of secondary velocities and streamwise vorticity for inviscid flows in curved ducts. This formulation is generalized for viscous flows and used to predict the development of internal three dimensional flow fields. The computed results are presented and compared with experimental measurements for the three-dimensional viscous flow in a straight duct.

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24

Thangam, S., and N. Hur. "Laminar secondary flows in curved rectangular ducts." Journal of Fluid Mechanics 217 (August 1990): 421–40. http://dx.doi.org/10.1017/s0022112090000787.

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The occurrence of secondary flow in curved ducts due to the centrifugal forces can often significantly influence the flow rate. In the present work, the secondary flow of an incompressible viscous fluid in a curved duct is studied by using a finite-volume method. It is shown that as the Dean number is increased the secondary flow structure evolves into a double vortex pair for low-aspect-ratio ducts and roll cells for ducts of high aspect ratio. A stability diagram is obtained in the domain of curvature ratio and Reynolds number. It is found that for ducts of high curvature the onset of transi

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25

Dutta, S., J. C. Han, Y. Zhang, and C. P. Lee. "Local Heat Transfer in a Rotating Two-Pass Triangular Duct With Smooth Walls." Journal of Turbomachinery 118, no. 3 (1996): 435–43. http://dx.doi.org/10.1115/1.2836685.

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Earlier heat transfer studies with orthogonal rotation were conducted mostly on ducts of square cross section. This paper reports a different cross section, a triangular duct. Unlike a square cross section, the triangular shape provides more restriction to the formation of the secondary flows. Moreover, the studied orientation of the right triangular duct avoids formation of symmetric vortex structures in the crossflow plane. This paper presents turbulent heat transfer characteristics of a two-pass smooth-walled triangular duct. One pass is for radial outward flow and the other for radial inwa

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26

Mori, Masaaki, and Kunihiko Ishihara. "Study on acoustic and flow-induced noise characteristics of L-shaped duct with a shallow cavity." Noise Control Engineering Journal 68, no. 3 (2020): 209–25. http://dx.doi.org/10.3397/1/376818.

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An aerodynamic sound generated by a flow inside a duct is one of the noise pro- blems. Flows in ducts with uneven surfaces such as grooves or cavities can be seen in various industrial devices and industrial products such as air-conditioning equipment in various plants or piping products. In this article, we have performed experiments and simulations to clarify acoustic and flow-induced sound characteris- tics of L-shaped duct with a shallow cavity installed. The experiments and simula- tions were performed under several inflow velocity conditions. The results show that the characteristics of

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27

Lopez-Doriga, B., M. Atzori, R. Vinuesa, H. J. Bae, A. Srivastava, and S. T. M. Dawson. "Linear and nonlinear Granger causality analysis of turbulent duct flows." Journal of Physics: Conference Series 2753, no. 1 (2024): 012017. http://dx.doi.org/10.1088/1742-6596/2753/1/012017.

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Abstract This research focuses on the identification and causality analysis of coherent structures that arise in turbulent flows in square and rectangular ducts. Coherent structures are first identified from direct numerical simulation data via proper orthogonal decomposition (POD), both by using all velocity components, and after separating the streamwise and secondary components of the flow. The causal relations between the mode coefficients are analysed using pairwise-conditional Granger causality analysis. We also formulate a nonlinear Granger causality analysis that can account for nonlin

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28

Hickling, Tom, and Grant Ingram. "Reynolds-averaged Navier–Stokes modelling in transonic S-ducts with passive flow control." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 1 (2019): 31–45. http://dx.doi.org/10.1177/0957650919845765.

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S-duct diffusers are used in aircraft with embedded engines to route ambient air to the fan face. Sizing and stealth considerations drive a need for high curvature ducts, but the curvature causes complex secondary flows that lead to total pressure distortion and swirl velocities at the engine face. These must be controlled for stable engine operation. In this paper, tubercles, a novel bio-inspired passive flow control method, are analysed numerically in a duct with transonic flow. The results are compared to experimental data obtained as part of a campaign at the Royal Military College, Canada

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29

Masouros, S. D., and K. Mathioudakis. "Estimation of transient wall and flow temperature distributions in a circular duct using an inverse approach." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 11 (2007): 1353–61. http://dx.doi.org/10.1243/09544062jmes307.

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Inverse methods have become a useful tool for estimating parameters that cannot be measured or calculated directly in engineering applications. Parameters characterizing unsteady heat convection in circular duct flows are associated with numerous uncertainties. This fact renders the inverse approach appropriate for the determination of these parameters. An inverse problem for transient turbulent thermally developing and thermally developed forced-convection flow in a circular duct is formulated and discussed, and a simplified direct thermal model is presented. Parameters of the model are estim

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30

Liu, Min, Jun Yao, and Yanlin Zhao. "Particle dispersion in turbulent sedimentary duct flows." Advanced Powder Technology 32, no. 11 (2021): 4245–62. http://dx.doi.org/10.1016/j.apt.2021.09.032.

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31

Yao, J., and M. Fairweather. "Particle deposition in turbulent square duct flows." Journal of Physics: Conference Series 318, no. 5 (2011): 052005. http://dx.doi.org/10.1088/1742-6596/318/5/052005.

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32

TAKEISHI, Keisuke, Genta KAWAHARA, Takeyuki ONISHI, Susumu GOTO, and Hiro ARAKO. "0513 Transient turbulence in rectangular-duct flows." Proceedings of the Fluids engineering conference 2013 (2013): _0513–01_—_0513–03_. http://dx.doi.org/10.1299/jsmefed.2013._0513-01_.

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33

Smolentsev, S. "MHD duct flows under hydrodynamic “slip” condition." Theoretical and Computational Fluid Dynamics 23, no. 6 (2009): 557–70. http://dx.doi.org/10.1007/s00162-009-0108-7.

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34

Khezzar, L., J. H. Whitelaw, and M. Yianneskis. "Round Sudden-Expansion Flows." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 200, no. 6 (1986): 447–55. http://dx.doi.org/10.1243/pime_proc_1986_200_154_02.

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This paper describes an experimental investigation of the water flows through one axisymmetric and two asymmetric round sudden expansions from a 48 mm to an 84 mm diameter pipe and eccentricities of the pipe axes of 0, 5 and 15 mm respectively. Flow visualization revealed the presence of vortex rings downstream of the plane of expansion for transitional Reynolds numbers (Re, based on the upstream pipe diameter and bulk flow velocity) and reattachment lengths were determined in the Reynolds number range 120–40 000 for all three cases. Detailed measurements of the three mean velocity components

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35

Boiko, Andrey, Kirill Demyanko, and Nikita Klyushnev. "Effect of Aspect Ratio on Optimal Disturbances of Duct Flows." Symmetry 15, no. 12 (2023): 2121. http://dx.doi.org/10.3390/sym15122121.

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The linear temporal stability of the Poiseuille flow through a rectangular duct is considered. The effect of the duct aspect ratio on the transient growth of disturbances, which causes the so-called subcritical laminar–turbulent transition, is studied numerically. In particular, it is shown that an increase in the aspect ratio promotes the subcritical transition in almost the entire considered range of the duct aspect ratios except a relatively narrow range, where the increase suppresses the transient growth of disturbances. Such peculiarity is qualitatively explained by considering the nonmod

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36

Vansovich, V. Ye, Yu M. Kotik, V. I. Pshenichnyi, and R. S. Vastyanov. "DIFFERENT ANATOMY OF EXTRAHEPATIC BILE DUCT IN PATIENTS WITH CALCULOUS CHOLECYSTITIS: CLINICAL OBSERVATIONS." Kharkiv Surgical School, no. 4-5 (October 26, 2022): 143–46. http://dx.doi.org/10.37699/2308-7005.4-5.2022.28.

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Summary. The aim of investigation – to get acquainted with the possibilities of variant anatomy of the extrahepatic bile ducts location. Results and their discussion. In our own practice, we observed two patients with the extrahepatic bile ducts atypical anatomy. Patient G. was operated because of chronic calculous cholecystitis. During laparoscopic cholecystectomy, we encountered the following situation: it was found that the gallbladder has a very short duct directly in the region of the portal of the liver. After dissection it was found that d. cysticus flows into the right hepa

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37

Pirozzoli, Sergio, Davide Modesti, Paolo Orlandi, and Francesco Grasso. "Turbulence and secondary motions in square duct flow." Journal of Fluid Mechanics 840 (February 14, 2018): 631–55. http://dx.doi.org/10.1017/jfm.2018.66.

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We study turbulent flows in pressure-driven ducts with square cross-section through direct numerical simulation in a wide enough range of Reynolds number to reach flow conditions which are representative of fully developed turbulence ($Re_{\unicode[STIX]{x1D70F}}\approx 1000$). Numerical simulations are carried out over very long integration times to get adequate convergence of the flow statistics, and specifically to achieve high-fidelity representation of the secondary motions which arise. The intensity of the latter is found to be on the order of 1 %–2 % of the bulk velocity, and approximat

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38

Colmanetti, Alex Roger Almeida, Marcelo Souza de Castro, Marcel Cavallini Barbosa, and Oscar Mauricio Hernandez Rodriguez. "Influence of Liquid Viscosity and Geometry on Vertical Gas/Liquid Two-Phase Annular-Duct Flow." SPE Journal 25, no. 06 (2020): 3236–49. http://dx.doi.org/10.2118/200491-pa.

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Summary Two-phase flow in large annular ducts is very common in industrial applications. Nevertheless, many two-phase-flow phenomena in such a geometry have not been fully understood. This article addresses an investigation on the effects of duct geometry and liquid viscosity on vertical upward annular-duct two-phase flows. Compressed air and tap water or mineral oil were the working fluids. Three oil viscosity ranges were tested, from 30 to 400 mPa·s. A 10.0-m-long inclinable experimental setup was designed and built for the experiments conducted in two equivalent geometries. The first is mad

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39

Soong, C. Y., S. T. Lin, and G. J. Hwang. "An Experimental Study of Convective Heat Transfer in Radially Rotating Rectangular Ducts." Journal of Heat Transfer 113, no. 3 (1991): 604–11. http://dx.doi.org/10.1115/1.2910608.

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The paper presents an experimental study of convective heat transfer in radially rotating isothermal rectangular ducts with various height and width aspect ratios. The convective heat transfer is affected by secondary flows resulting from Coriolis force and the buoyancy flow, which is in turn due to the centrifugal force in the duct. The growth and strength of the secondary flow depend on the rotational Reynolds number; the effect of the buoyancy flow is characterized by the rotational Rayleigh number. The aspect ratio of the duct may affect the secondary flow and the buoyancy flow, and theref

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40

Molokov, S., and L. Bühler. "Liquid metal flow in a U-bend in a strong uniform magnetic field." Journal of Fluid Mechanics 267 (May 25, 1994): 325–52. http://dx.doi.org/10.1017/s0022112094001205.

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Magnetohydrodynamic flows in a U-bend and in a right-angle bend are considered with reference to the toroidal concepts of self-cooled liquid-metal blankets. The ducts composing the bends have rectangular cross-sections. The applied magnetic field is aligned with the toroidal duct and perpendicular to ducts supplying liquid metal. For high Hartmann numbers the flow region is divided into cores and boundary layers of different types. The magnetohydrodynamic equations are reduced to a system of partial differential equations governing wall electric potentials and the core pressure. The system is

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41

McBrien, R. K., and B. R. Baliga. "Module Friction Factors and Intramodular Pressure Distributions for Periodic Fully Developed Turbulent Flow in Rectangular Interrupted-Plate Ducts." Journal of Fluids Engineering 110, no. 2 (1988): 147–54. http://dx.doi.org/10.1115/1.3243527.

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This paper presents detailed time-mean pressure measurements for periodic fully developed turbulent flows in straight interrupted-plate ducts of rectangular cross section. Several combinations of plate spacing and duct aspect ratio are investigated for Reynolds numbers, based on a module hydraulic diameter, in the range 5000 to 45000. The experiments undertaken in this work establish the existence of steady, time-mean, periodic fully developed flows for all flow rates and geometric configurations investigated. The results include graphical and tabular presentations of module friction factor ve

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42

Boyle, M. T., M. Simonds, and K. Poon. "A Comparison of Secondary Flow in a Vane Cascade and a Curved Duct." Journal of Turbomachinery 111, no. 4 (1989): 530–36. http://dx.doi.org/10.1115/1.3262304.

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This paper describes an experiment performed to measure the aerodynamic characteristics of the three-dimensional flow through a linear cascade of turbine vanes. The three-dimensional cascade flow is compared to the three-dimensional flow through a duct with a shape similar to the cascade passage shape. The measurements provide a description of the cascade flow and of the duct flow. By comparing the viscous flows for these two geometries, the usefulness of the duct shape for simulating cascade aerodynamics is evaluated. Except in the leading edge region, the qualities of the two flows are very

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43

Belloni, Clarissa S. K., Richard H. J. Willden, and Guy T. Houlsby. "A Numerical Analysis of Bidirectional Ducted Tidal Turbines in Yawed Flow." Marine Technology Society Journal 47, no. 4 (2013): 23–35. http://dx.doi.org/10.4031/mtsj.47.4.16.

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AbstractThe paper presents a computational study of ducted bidirectional tidal turbines using three-dimensional Reynolds-averaged Navier-Stokes simulations. We model the outer duct as a solid body and use a porous disc to represent the turbine rotor, a simplification that captures changes in linear momentum and thus the primary interaction of the turbine with the flow through and around the duct while greatly reducing computational complexity. The duct is modeled using linearly converging and diverging sections and a short straight pipe at the duct throat.We investigate the performance of bare

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44

Sui, Xiuming, Wei Zhao, Xiaolei Sun, Weiwei Luo, and Qingjun Zhao. "Aerodynamic performance analysis and optimization of a turbine duct with low degree of partial admission." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 5 (2017): 988–1001. http://dx.doi.org/10.1177/0954410017691068.

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A partial admission turbine duct with outlet-to-inlet area ratio greater than unity can increase the admission degree of the downstream turbine stage and, thus improve the performance of a multistage turbine with a low partial admission degree. However, the upstream flow structures of ducts, such as secondary flow, especially the circumferential nonuniformities originating from the effect of the partial admission, make the flow in ducts complex. The complexity of the flow has a negative impact on the performance of ducts. In the present investigation, numerical study of the flow behavior withi

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Ghia, K. N., U. Ghia, and C. T. Shin. "Study of Fully Developed Incompressible Flow in Curved Ducts, Using a Multi-Grid Technique." Journal of Fluids Engineering 109, no. 3 (1987): 226–36. http://dx.doi.org/10.1115/1.3242652.

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Fully developed flows inside curved ducts of rectangular as well as polar cross sections have been analyzed using the Navier-Stokes equations in terms of the axial velocity and vorticity and the cross-flow stream function. Numerical solutions of the three second-order coupled elliptic partial differential equations governing this flow have been obtained using efficient numerical schemes. For curved-duct flows, the similarity parameter of significance is the Dean number K, rather than the Reynolds number Re. Results have been obtained for curved ducts with square cross sections for K up to 900

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Viswanathan, Aroon K., and Danesh K. Tafti. "A Comparative Study of DES and URANS for Flow Prediction in a Two-Pass Internal Cooling Duct." Journal of Fluids Engineering 128, no. 6 (2006): 1336–45. http://dx.doi.org/10.1115/1.2353279.

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The capabilities of the detached eddy simulation (DES) and the unsteady Reynolds averaged Navier-Stokes (URANS) versions of the 1988 k-ω model in predicting the turbulent flow field in a two-pass internal cooling duct with normal ribs is presented. The flow is dominated by the separation and reattachment of shear layers; unsteady vorticity induced secondary flows and strong streamline curvature. The techniques are evaluated in predicting the developing flow at the entrance to the duct and downstream of the 180deg bend, fully developed regime in the first pass, and in the 180deg bend. Results o

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Moura, Paula Wrague, Leonardo Rodrigues Leite, Márcio Wrague Moura, et al. "Numerical Evaluation of the Influence of Different Parameters on the Thermoenergetic Performance of the Earth-Air Heat Exchanger in a Social Housing." Defect and Diffusion Forum 436 (September 20, 2024): 117–26. http://dx.doi.org/10.4028/p-4gjprl.

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Earth-Air Heat Exchanger (EAHE) is a device that cools or heats air as it flows through underground ducts, helping to lower energy usage while ensuring comfortable thermal conditions. This investigation is designed to assess the thermoenergetic performance of an EAHE in Social Housing (SH) when submitted to different operating and constructive parameters and suggest strategies to improve energy efficiency in buildings. The study involves thermal and energy evaluations of a device integrated into SH, exploring varying air velocity, duct length, and duct diameter. Dynamic simulations using Energ

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ZHANG, HAIFENG, and GOODARZ AHMADI. "Aerosol particle transport and deposition in vertical and horizontal turbulent duct flows." Journal of Fluid Mechanics 406 (March 10, 2000): 55–80. http://dx.doi.org/10.1017/s0022112099007284.

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Aerosol particle transport and deposition in vertical and horizontal turbulent duct flows in the presence of different gravity directions are studied. The instantaneous fluid velocity field is generated by the direct numerical simulation of the Navier–Stokes equation via a pseudospectral method. A particle equation of motion including Stokes drag, Brownian diffusion, lift and gravitational forces is used for trajectory analysis. Ensembles of 8192 particle paths are evaluated, compiled, and statistically analysed. The results show that the wall coherent structure plays an important role in the

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Modi, Vijay, and F. K. Moore. "Laminar separation in buoyant channel flows." Journal of Fluid Mechanics 177 (April 1987): 37–47. http://dx.doi.org/10.1017/s0022112087000843.

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A slow moving flow in a duct emerging into a quiescent negatively buoyant environment may separate from its inner wall prior to the lip. Buoyancy accelerates the flow, curving the streamlines within the duct away from the walls. The resulting deceleration at the wall may be sufficient to provoke separation. The problem of the location of this separation point in a two-dimensional channel is studied. A potential-flow model is examined first to explore the large-Reynolds-number behaviour. The form of the potential-flow description in the vicinity of the assumed location of separation is characte

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Modi, Vijay, and K. E. Torrance. "Experimental and Numerical Studies of Cold Inflow at the Exit of Buoyant Channel Flows." Journal of Heat Transfer 109, no. 2 (1987): 392–99. http://dx.doi.org/10.1115/1.3248093.

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Experimental and numerical studies of the separation of a smooth attached buoyant flow from the inner wall of a duct, as the duct discharges into a quiescent environment, are reported. The associated penetration of neutrally buoyant ambient fluid into the duct is called cold inflow. The experimental study was carried out for air flows over ranges of Reynolds and Froude numbers, based on duct radius, of Re = 2400 to 3300 and Fr = 0.68 to 2.69. The experiments provide information on the onset and extent of cold inflow in a turbulent flow regime. Spatial profiles of fluctuating temperature reveal

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