Log in

Relevant bibliographies by topics / Expansion pipe flow / Journal articles

To see the other types of publications on this topic, follow the link: Expansion pipe flow.

Journal articles on the topic 'Expansion pipe flow'

Author: Grafiati

Published: 11 January 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Expansion pipe flow.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Togun, Hussein, Tuqa Abdulrazzaq, Salim Kazi, and Ahmad Badarudin. "Augmented of turbulent heat transfer in an annular pipe with abrupt expansion." Thermal Science 20, no. 5 (2016): 1621–32. http://dx.doi.org/10.2298/tsci140816138t.

Full text

Abstract:

This paper presents a study of heat transfer to turbulent air flow in the abrupt axisymmetric expansion of an annular pipe. The experimental investigations were performed in the Reynolds number range from 5000 to 30000, the heat flux varied from 1000 to 4000 W/m2, and the expansion ratio was maintained at D/d=1, 1.25, 1.67 and 2. The sudden expansion was created by changing the inner diameter of the entrance pipe to an annular passage. The outer diameter of the inner pipe and the inner diameter of the outer pipe are 2.5 and 10 cm, respectively, where both of the pipes are subjected to uniform

APA, Harvard, Vancouver, ISO, and other styles

2

Sherza, Jenan S. "Theoretical Investigation of The Major and Minor Losses in Pipes and Fittings." Babylonian Journal of Mechanical Engineering 2024 (March 20, 2024): 12–18. https://doi.org/10.58496/bjme/2024/003.

Full text

Abstract:

The present study aims to investigate major pressure losses in pipes and minor losses in certain pipe fittings, such as sudden expansion. Initially, the relationships for calculating major and minor losses were derived by applying Bernoulli's equation to the studied components. Flow velocity, pipe diameter, and pipe length effects on major losses were examined. Additionally, the impact of velocity on minor losses in sudden expansion was analysed. The results demonstrated that major losses, represented by friction, significantly vary with changes in flow velocity, pipe diameter, and pipe length

APA, Harvard, Vancouver, ISO, and other styles

3

LI, X. F., G. H. TANG, T. Y. GAO, and W. Q. TAO. "SIMULATION OF NEWTONIAN AND NON-NEWTONIAN AXISYMMETRIC FLOW WITH AN AXISYMMETRIC LATTICE BOLTZMANN MODEL." International Journal of Modern Physics C 21, no. 10 (2010): 1237–54. http://dx.doi.org/10.1142/s0129183110015804.

Full text

Abstract:

Axisymmetric flow is of both fundamental interest and practical significance. A recently derived axisymmetric lattice Boltzmann model [J. G. Zhou, Phys. Rev. E78, 036701 (2008)] is adopted for studying several typical axisymmetric flows. First, the Hagen–Poiseuille flow in circular pipes is validated and the Poiseuille flow in annular cylinders is studied under different values of the radius ratio. Second, pulsatile flow in an axisymmetric pipe with a sinusoidal pressure gradient is conducted. Third, flows through pipes with various constrictions or expansions are discussed. Finally, we extend

APA, Harvard, Vancouver, ISO, and other styles

4

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.

Full text

Abstract:

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

APA, Harvard, Vancouver, ISO, and other styles

5

Hayashi, Thamy C., Isabel Malico, and J. F. C. Pereira. "Analysis of the Flow at the Interface of a Porous Media." Defect and Diffusion Forum 283-286 (March 2009): 616–21. http://dx.doi.org/10.4028/www.scientific.net/ddf.283-286.616.

Full text

Abstract:

The influence of inserting ceramic foam in a pipe with a 1:4 sudden expansion was numerical investigated. The foam, with a thickness to diameter ratio of 0.60, was positioned at different distances from the sudden pipe expansion wall. Three different porosities were analyzed (10, 20 and 60 pores per inch) for pore Reynolds numbers in the range of 20-400, corresponding to pipe Reynolds numbers of 2400 to 22000 in the pipe section upstream the sudden expansion. Predictions of the sudden pipe expansion cavity assuming laminar flow within the foam yield the penetration of the separated flow region

APA, Harvard, Vancouver, ISO, and other styles

6

Kaewchoothong, Natthaporn, Makatar Wae-Hayee, Passakorn Vessakosol, Banyat Niyomwas, and Chayut Nuntadusit. "Flow and Heat Transfer Characteristics of Impinging Jet from Expansion Pipe Nozzle with Air Entrainment Holes." Advanced Materials Research 931-932 (May 2014): 1213–17. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.1213.

Full text

Abstract:

Flow and heat transfer characteristics of impinging jet from expansion pipe were experimentally and numerically investigated. The expansion pipe nozzle was drilled on expansion wall for increasing an entrainment of ambient air into a jet flow. The diameter of round pipe nozzle was d=17.2 mm and the diameter of expansion pipe was fixed at D=68.8 mm (=4d). The number of air entrainment holes was varied at 4, 6 and 8 holes, and the expansion pipe length was examined at L= 2d, 4d and 6d. In this study, the expansion pipe exit-to-plate distance was fixed at H=2d and the Reynolds number of jet was s

APA, Harvard, Vancouver, ISO, and other styles

7

Topakoglu, H. C., and M. A. Ebadian. "Viscous laminar flow in a curved pipe of elliptical cross-section." Journal of Fluid Mechanics 184 (November 1987): 571–80. http://dx.doi.org/10.1017/s0022112087003021.

Full text

Abstract:

In this paper, the analysis on secondary flow in curved elliptic pipes of Topakoglu & Ebadian (1985) has been extended up to a point where the rate-of-flow expression is obtained for any value of flatness ratio of the elliptic cross-section. The analysis is based on the double expansion method of Topakoglu (1967). Therefore, no approximation is involved in any step other than the natural limitation of the finite number of calculated terms of the expansions. The obtained results are systematically plotted against the curvature of centreline of the curved pipe for different values of Reynold

APA, Harvard, Vancouver, ISO, and other styles

8

Sisavath, Sourith, Xudong Jing, Chris C. Pain, and Robert W. Zimmerman. "Creeping Flow Through an Axisymmetric Sudden Contraction or Expansion." Journal of Fluids Engineering 124, no. 1 (2001): 273–78. http://dx.doi.org/10.1115/1.1430669.

Full text

Abstract:

Creeping flow through a sudden contraction/expansion in an axisymmetric pipe is studied. Sampson’s solution for flow through a circular orifice in an infinite wall is used to derive an approximation for the excess pressure drop due to a sudden contraction/expansion in a pipe with a finite expansion ratio. The accuracy of this approximation obtained is verified by comparing its results to finite-element simulations and other previous numerical studies. The result can also be extended to a thin annular obstacle in a circular pipe. The “equivalent length” corresponding to the excess pressure drop

APA, Harvard, Vancouver, ISO, and other styles

9

Chang, K. C., W. D. Hsieh, and C. S. Chen. "A Modified Low-Reynolds-Number Turbulence Model Applicable to Recirculating Flow in Pipe Expansion." Journal of Fluids Engineering 117, no. 3 (1995): 417–23. http://dx.doi.org/10.1115/1.2817278.

Full text

Abstract:

A modified low-Reynolds-number k-ε turbulence model is developed in this work. The performance of the proposed model is assessed through testing with fully developed pipe flows and recirculating flow in pipe expansion. Attention is specifically focused on the flow region around the reattachment point. It is shown that the proposed model is capable of correctly predicting the near-wall limiting flow behavior while avoiding occurrence of the singular difficulty near the reattachment point as applying to the recirculating flow in sudden-expansion pipe.

APA, Harvard, Vancouver, ISO, and other styles

10

Baughn, J. W., M. A. Hoffman, R. K. Takahashi, and Daehee Lee. "Heat Transfer Downstream of an Abrupt Expansion in the Transition Reynolds Number Regime." Journal of Heat Transfer 109, no. 1 (1987): 37–42. http://dx.doi.org/10.1115/1.3248064.

Full text

Abstract:

The heat transfer downstream of an axisymmetric abrupt expansion in a pipe in the transition Reynolds number regime has been investigated experimentally. In these experiments the wall of the downstream pipe was heated to give a constant heat flux into the air flow. The ratio of the upstream to downstream pipe diameters was 0.8 and the downstream Reynolds number ranged from 1420 to 8060. Within a narrow range of Reynolds numbers, around 5000, the position of the maximum Nusselt number was found to shift considerably. This interesting behavior may be associated with the flow instabilities in sud

APA, Harvard, Vancouver, ISO, and other styles

11

Monprapussorn, T., C. Athisakul, and S. Chucheepsakul. "Nonlinear Vibrations of an Extensible Flexible Marine Riser Carrying a Pulsatile Flow." Journal of Applied Mechanics 74, no. 4 (2006): 754–69. http://dx.doi.org/10.1115/1.2711226.

Full text

Abstract:

The influence of transported fluid on static and dynamic behaviors of marine risers is investigated. The internal flow of the transported fluid could have a constant, a linear, or a wave velocity. The riser pipe may possibly experience the conditions of high extensibility, flexibility, and large displacements. Accordingly, the mathematical riser models should be governed by the large strain formulations of extensible flexible pipes transporting fluid. Nonlinear hydrodynamic dampings due to ocean wave–pipe interactions implicate the high degree of nonlinearity in the riser vibrations, for which

APA, Harvard, Vancouver, ISO, and other styles

12

Abbazov, I., M. Khodjiev, A. Salimov, and F. Egamberdiyev. "Investigation of air velocity in expanding and contracting pipes for the transport of fibrous materials." IOP Conference Series: Earth and Environmental Science 1142, no. 1 (2023): 012101. http://dx.doi.org/10.1088/1755-1315/1142/1/012101.

Full text

Abstract:

Abstract Uzbekistan is implementing comprehensive measures to produce a wide range of high-quality and inexpensive textile and light industry products based on the production and deep processing of cotton fiber, which is the main textile raw material, to prevent waste and increase its competitiveness. This article, to a certain extent, serves to implement the tasks specified in the Decree of the Cabinet of Ministers dated November 25, 2018 No. 53 “On additional measures to organize the activities of cotton and textile industries and clusters” and other regulatory and legal documents related to

APA, Harvard, Vancouver, ISO, and other styles

13

Torii, Shuichi, and Wen-Jei Yang. "Secondary Flow Phenomena in an Axially Rotating Flow Passage with Sudden Expansion or Contraction." International Journal of Rotating Machinery 5, no. 2 (1999): 117–22. http://dx.doi.org/10.1155/s1023621x9900010x.

Full text

Abstract:

This paper investigates rotational effects on secondary flow in rotating flow passages with sudden expansion or contraction. Consideration is given to laminar flow. The governing boundary-layer equations are discretized by means of a finite-difference technique and numerically solved to determine the distributions of velocity vector under the appropriate boundary conditions. The Reynolds number (Re) and rotation rate are varied to determine their effects on the formation ofsecondary flows. It is disclosed from the study that: (i) when laminar flow is introduced into an axially rotating pipe wi

APA, Harvard, Vancouver, ISO, and other styles

14

Sun, Qi Guo, Xiong Shi Wang, Ying Wang, and Zhi Hong Li. "The Characteristics of the Annular Flow through the Sudden-Expansion Pipe of the Oil-Air Lubrication System." Advanced Materials Research 889-890 (February 2014): 358–62. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.358.

Full text

Abstract:

The characteristics of the sudden-expansion pipe in oil-air lubrication system have been analyzed based on Fluent. The results show that the pressure and oil film mutate when the annular flow through the sudden-expansion pipe and the suddenly change of position of pressure and film is not affected by the inlet air velocity, however, the strength of pressure and film is in direct ratio with the inlet air velocity. The film of oil-air annular flow in the pipeline before the suddenly expanding part is well-distributed, but the distribution after that is widely affected by the air velocity and the

APA, Harvard, Vancouver, ISO, and other styles

15

KERSWELL, R. R., and O. R. TUTTY. "Recurrence of travelling waves in transitional pipe flow." Journal of Fluid Mechanics 584 (July 25, 2007): 69–102. http://dx.doi.org/10.1017/s0022112007006301.

Full text

Abstract:

The recent theoretical discovery of families of unstable travelling-wave solutions in pipe flow at Reynolds numbers lower than the transitional range, naturally raises the question of their relevance to the turbulent transition process. Here, a series of numerical experiments are conducted in which we look for the spatial signature of these travelling waves in transitionary flows. Working within a periodic pipe of 5D (diameters) length, we find that travelling waves with low wall shear stresses (lower branch solutions) are on a surface in phase space which separates initial conditions which un

APA, Harvard, Vancouver, ISO, and other styles

16

Sommerfeld, M., A. Ando, and D. Wennerberg. "Swirling, Particle-Laden Flows Through a Pipe Expansion." Journal of Fluids Engineering 114, no. 4 (1992): 648–56. http://dx.doi.org/10.1115/1.2910081.

Full text

Abstract:

The present study concerns a particle-laden, swirling flow through a pipe expansion. A gas-particle flow enters the test section through a center tube, and a swirling air stream enters through a coaxial annulus. The swirl number based on the total inflow is 0.47. Numerical predictions of the gas flow were performed using a finite-volume approach for solving the time-averaged Navier-Stokes equations. The predicted mean velocity profiles showed good agreement with experimental results when using the standard k-ε turbulence model. The turbulent kinetic energy of the gas phase, however, is conside

APA, Harvard, Vancouver, ISO, and other styles

17

Wang, Weibing, and Yongsheng Ren. "Erosion-Corrosion of AISI 302 Stainless Steel Sudden Expansion Pipes in High Salt Wastewater: Effect of Fluid Flow on Different Positions of a Sudden Expansion Pipe." Corrosion 77, no. 4 (2021): 461–69. http://dx.doi.org/10.5006/3618.

Full text

Abstract:

Erosion-corrosion (E-C) is common in chemical industries. Sudden expansion pipes (SEP) are one of the flow components which may experience severe erosion rates. Computational fluid dynamic modeling (CFD) and flow-through experiments were used to study E-C for a SEP of AISI 302 stainless steel. A typical geometry for SEP was investigated: 20 mm diameter inlet pipe, 40 mm diameter outlet pipe, with an inlet flow rate of 0.1 m/s, and 10 wt% concentration of SiO2. CFD simulation results showed that turbulence energy and wall shear were highest at 5 mm and fluid axial velocity was lowest at 5 mm fr

APA, Harvard, Vancouver, ISO, and other styles

18

Tumin, Anatoli. "Receptivity of pipe Poiseuille flow." Journal of Fluid Mechanics 315 (May 25, 1996): 119–37. http://dx.doi.org/10.1017/s0022112096002364.

Full text

Abstract:

The receptivity problem is considered for pipe flow with periodic blow–suction through a narrow gap in the pipe wall. Axisymmetric and non-axisymmetric modes (1, 2, and 3) are analysed. The method of solution is based on global eigenvalue analysis for spatially growing disturbances in circular pipe Poiseuille flow. The numerical procedure is formulated in terms of the collocation method with the Chebyshev polynomials application. The receptivity problem is solved with an expansion of the solution in a biorthogonal eigenfunction system, and it was found that there is an excitation of many eigen

APA, Harvard, Vancouver, ISO, and other styles

19

Vittal Shenoy, Dhanush, Mostafa Safdari Shadloo, Jorge Peixinho, and Abdellah Hadjadj. "Direct numerical simulations of laminar and transitional flows in diverging pipes." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 1 (2019): 75–92. http://dx.doi.org/10.1108/hff-02-2019-0111.

Full text

Abstract:

Purpose Fluid flows in pipes whose cross-sectional area are increasing in the stream-wise direction are prone to separation of the recirculation region. This paper aims to investigate such fluid flow in expansion pipe systems using direct numerical simulations. The flow in circular diverging pipes with different diverging half angles, namely, 45, 26, 14, 7.2 and 4.7 degrees, are considered. The flow is fed by a fully developed laminar parabolic velocity profile at its inlet and is connected to a long straight circular pipe at its downstream to characterise recirculation zone and skin friction

APA, Harvard, Vancouver, ISO, and other styles

20

Lebon, Benoît, Jorge Peixinho, Shun Ishizaka, and Yuji Tasaka. "Subcritical transition to turbulence in a sudden circular pipe expansion." Journal of Fluid Mechanics 849 (June 18, 2018): 340–54. http://dx.doi.org/10.1017/jfm.2018.421.

Full text

Abstract:

The results of experiments on the flow through a circular sudden expansion pipe at moderate Reynolds numbers are presented. At five diameters upstream of the expansion, laminar flow was disturbed by a (constant) cross-flow jet, a suction or a (periodic in–out) synthetic jet from a hole in the wall. When the disturbance exceeded a critical value of the control parameter depending on the Reynolds number, localised turbulent patches formed downstream of the expansion at fixed axial positions. For the cross-flow jet, the onset of turbulent patches is related to the velocity ratio of the mean jet v

APA, Harvard, Vancouver, ISO, and other styles

21

Kells, James A., and C. D. Smith. "Head recovery at submerged abrupt conduit outlets." Canadian Journal of Civil Engineering 15, no. 2 (1988): 272–74. http://dx.doi.org/10.1139/l88-035.

Full text

Abstract:

The question of an abrupt expansion in a pipeline from one diameter to a larger diameter is a classical problem dealt with in most undergraduate fluid mechanics texts. A problem not dealt with, but which is far more common in practice, is the abrupt expansion at the terminal end of a pipe where the flow expands into an open channel downstream. It is often assumed that the entire velocity head for the pipe flow is lost. This is not necessarily true. In this paper, the experimental study of an abrupt expansion into an open channel is reported. Several different channel shapes are used in an atte

APA, Harvard, Vancouver, ISO, and other styles

22

Akiyoshi, T., K. Fuchida, S. Shirinashihama, and T. Tsutsumi. "Effectiveness of Anti-Liquefaction Techniques for Buried Pipelines." Journal of Pressure Vessel Technology 116, no. 3 (1994): 261–66. http://dx.doi.org/10.1115/1.2929585.

Full text

Abstract:

In this paper, effectiveness of several existing anti-liquefaction methods for preventing large deformations of pipelines for lateral flow of liquefied grounds during earthquakes are investigated and compared, as well as a proposed method which fixes pipelines with expansion joints parallel to auxiliary continuous pipes using iron tie-plates. Stiffness of liquefied soils around pipes is represented as a static coefficient of subgrade reaction, based on the experiments on the interaction between liquefied sand deposits and pipes. Pipeline-spring systems which are characterized by those coeffici

APA, Harvard, Vancouver, ISO, and other styles

23

Wang, Dong, David J. White, and Mark F. Randolph. "Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement." Canadian Geotechnical Journal 47, no. 8 (2010): 842–56. http://dx.doi.org/10.1139/t09-147.

Full text

Abstract:

Seabed pipelines must be designed to accommodate thermal expansion — which is commonly achieved through controlled lateral buckling — and to resist damage from submarine slides. In both cases, the pipe moves laterally by a significant distance and the overall pipeline response is strongly influenced by the lateral pipe–soil resistance. Here, the process of pipe penetration and lateral displacement is investigated using a large-deformation finite element method, with a softening rate–dependent soil model being incorporated. The calculated soil flow mechanisms, pipe resistances, and trajectories

APA, Harvard, Vancouver, ISO, and other styles

24

Ando, Toshitake, Toshihiko Shakouchi, Hiroyuki Yamamoto, and Koichi Tsujimoto. "726 Flow characteristics and control of separated shear flow in sudden expansion pipe." Proceedings of the Fluids engineering conference 2005 (2005): 111. http://dx.doi.org/10.1299/jsmefed.2005.111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Mahmood, Raid A., Khalid Saleh, Veyan A. Musa, Enass Massoud, Ahmad Sharifian-Barforoush, and Lokman A. Abdulkareem. "Two-Phase Flow Development of R134a in a Horizontal Pipe: Computational Investigation." International Journal of Heat and Technology 39, no. 5 (2021): 1532–40. http://dx.doi.org/10.18280/ijht.390515.

Full text

Abstract:

To improve the performance of vapor compression refrigeration systems that use vertical gravitational flash tank separators, the liquid separation efficiency of the vertical gravitational flash tank separator requires to be approved. To approach this improvement, the two-phase flow development and its behavior after the expansion device need to be investigated and predicted. For thus, this paper presents a three-dimensional computational investigation of the two-phase flow development of R134a after the expansion device in a horizontal pipe. Computational Fluid Dynamic (CFD) was used to predic

APA, Harvard, Vancouver, ISO, and other styles

26

DUGUET, Y., A. P. WILLIS, and R. R. KERSWELL. "Slug genesis in cylindrical pipe flow." Journal of Fluid Mechanics 663 (October 5, 2010): 180–208. http://dx.doi.org/10.1017/s0022112010003435.

Full text

Abstract:

Transition to uniform turbulence in cylindrical pipe flow occurs experimentally via the spatial expansion of isolated coherent structures called ‘slugs’, triggered by localized finite-amplitude disturbances. We study this process numerically by examining the preferred route in phase space through which a critical disturbance initiates a ‘slug’. This entails first identifying the relative attractor – ‘edge state’ – on the laminar–turbulent boundary in a long pipe and then studying the dynamics along its low-dimensional unstable manifold, leading to the turbulent state. Even though the fully tur

APA, Harvard, Vancouver, ISO, and other styles

27

Pakhomov, Maksim A., and Viktor I. Terekhov. "Modeling of Turbulent Heat-Transfer Augmentation in Gas-Droplet Non-Boiling Flow in Diverging and Converging Axisymmetric Ducts with Sudden Expansion." Energies 15, no. 16 (2022): 5861. http://dx.doi.org/10.3390/en15165861.

Full text

Abstract:

The effect of positive (adverse) and negative (favorable) longitudinal pressure gradients on the structure and heat transfer of gas-droplet (air and water) flow in axisymmetric duct with sudden expansion are examined. The superimposed pressure gradient has a large influence on the flow structure and heat transfer in a two-phase mist flow in both a confuser and a diffuser. A narrowing of the confuser angle leads to significant suppression of flow turbulence (more than four times that of the gas-drop flow after sudden pipe expansion without a pressure gradient at φ = 0°). Recirculation zone leng

APA, Harvard, Vancouver, ISO, and other styles

28

Said, S. A. M., M. A. Habib, and M. O. Iqbal. "Heat transfer to pulsating turbulent flow in an abrupt pipe expansion." International Journal of Numerical Methods for Heat & Fluid Flow 13, no. 3 (2003): 286–308. http://dx.doi.org/10.1108/09615530310464517.

Full text

Abstract:

A numerical investigation aimed at understanding the flow and heat transfer characteristics of pulsating turbulent flow in an abrupt pipe expansion was carried out. The flow patterns are classified by four parameters; the Reynolds number, the Prandtl number, the abrupt expansion ratio and the pulsation frequency. The influence of these parameters on the flow was studied in the range 104<Re<5×104, 0.7<Pr<7.0, 0.2<d/D<0.6 and 5<f<35. It was found that the influence of pulsation on the mean time‐averaged Nusselt number is insignificant (around 10 per cent increase) for flu

APA, Harvard, Vancouver, ISO, and other styles

29

Banis, Kārlis. "The Effect of separated Expansion Chamber Parameters on Exhaust Pressure Oscillations in Single Cylinder Motorcycle Engine." Rural Sustainability Research 43, no. 338 (2020): 42–51. http://dx.doi.org/10.2478/plua-2020-0006.

Full text

Abstract:

AbstractThis paper investigates the effect of separated exhaust expansion chamber parameters on pressure oscillations in spark-ignited internal combustion (IC) gasoline engines. It is known that exhaust expansion chambers are becoming increasingly more popular among both – original equipment (OE) and aftermarket equipment (AE) exhaust system manufacturers for performance-oriented motorcycles equipped with mainly single cylinder engines, but the companies are reluctant to reveal any detailed principles of operation of the mentioned expansion chambers. The subject of this research is the type of

APA, Harvard, Vancouver, ISO, and other styles

30

El-Askary, W. A., I. M. Eldesoky, O. Saleh, Samy M. El-Behery, and A. S. Dawood. "Behavior of downward turbulent gas–solid flow through sudden expansion pipe." Powder Technology 291 (April 2016): 351–65. http://dx.doi.org/10.1016/j.powtec.2016.01.002.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

ANDO, Toshitake, Toshihiko SHAKOUCHI, Hiroyuki YAMAMOTO, and Koichi TSUJIMOTO. "Control of Flow Separation and Drag Reduction of Abrupt Expansion Pipe." Transactions of the Japan Society of Mechanical Engineers Series B 72, no. 717 (2006): 1125–30. http://dx.doi.org/10.1299/kikaib.72.1125.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

VOUTSINAS, Alexandros, Toshihiko SHAKOUCHI, Koichi TSUJIMOTO, and Toshitake ANDO. "Fluctuating Phenomena and Flow Control of Bubbly Two-Phase Flow Through Sudden Expansion Pipe." Journal of Fluid Science and Technology 4, no. 1 (2009): 84–94. http://dx.doi.org/10.1299/jfst.4.84.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Pazanin, Igor. "Asymptotic solution for the Darcy-Brinkman-Boussinesq flow in a pipe with helicoidal shape." Theoretical and Applied Mechanics 45, no. 2 (2018): 189–203. http://dx.doi.org/10.2298/tam180424008p.

Full text

Abstract:

We study the fluid flow and heat transfer in a helical pipe filled with a sparsely packed porous medium. Motivated by the engineering applications, pipe?s thickness and the distance between two coils of the helix have the same small order of magnitude, whereas the fluid inside the pipe is assumed to be cooled (or heated) by the exterior medium. After writing the dimensionless Darcy?Brinkman?Boussinesq system in curvilinear coordinates, we employ the multi-scale expansion technique to formally derive the effective model valid for small Brinkman?Darcy number. The obtained asymptotic solution is

APA, Harvard, Vancouver, ISO, and other styles

34

Ahmad Yani, Ratnawati, and Ardyanto Darmanto. "Analisa Kerugian Head Akibat Perluasan Dan Penyempitan Penampang Pada Sambungan 90o." Jurnal Teknik Juara Aktif Global Optimis 1, no. 1 (2021): 46–55. http://dx.doi.org/10.53620/jtg.v1i1.10.

Full text

Abstract:

PVC pipe (polyvinyl chloride), galvanized, and stainless steel are types of pipes that are widely used, especially for delivering clean water to people's homes or in the industrialized world. This research was conducted by collecting data such as: flow rate (Q), pressure height (h), pipe flow velocity (v), time (s), and head loss (H), data were collected and calculated to determine pressure loss, effect variations in discharge changes and loss coefficients. From the experimental results, it was found that for the narrowing of the cross section at a discharge of 25 liters / second the value of

APA, Harvard, Vancouver, ISO, and other styles

35

Matvienko, O. V., A. E. Litvinova, and N. S. Firsanova. "The Cross model of liquid polymer- bitumen binder structure in a pipe with sudden expansion." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 24, no. 5 (2022): 151–68. http://dx.doi.org/10.31675/1607-1859-2022-24-5-151-168.

Full text

Abstract:

The paper investigates the liquid polymer-bitumen binder in a pipe with a sudden expansion. At small values of the expansion parameter, the formation of a high-viscosity liquid zone occurs in the axial region, and the effective viscosity decreases at the periphery and nearwall zones. The destruction process of structural bonds, which intensively proceeds near the flow from the supply pipe, leads to a decrease in the effective viscosity. The formation of a corner area of reverse flows is accompanied by the increase in the effective viscosity.

APA, Harvard, Vancouver, ISO, and other styles

36

Yang, Jaw-Yen, Li-Hsin Hung, and Yao-Tien Kuo. "Semiclassical Lattice Boltzmann Simulations of Rarefied Circular Pipe Flows." Communications in Computational Physics 10, no. 2 (2011): 405–21. http://dx.doi.org/10.4208/cicp.060210.270810a.

Full text

Abstract:

AbstractComputations of microscopic circular pipe flow in a rarefied quantum gas are presented using a semiclassical axisymmetric lattice Boltzmann method. The method is first derived by directly projecting the Uehling-Uhlenbeck Boltzmann-BGK equations in two-dimensional rectangular coordinates onto the tensor Hermite polynomials using moment expansion method and then the forcing strategy of Halliday et al. [Phys. Rev. E., 64 (2001), 011208] is adopted by adding forcing terms into the resulting microdynamic evolution equation. The determination of the forcing terms is dictated by yielding the

APA, Harvard, Vancouver, ISO, and other styles

37

Li, Xue, Ning Zhou, Xuanya Liu, Weiqiu Huang, Bing Chen, and Vamegh Rasouli. "Numerical simulation of the influence of pipe length on explosion flame propagation in open-ended and close-ended pipes." Science Progress 103, no. 4 (2020): 003685042096160. http://dx.doi.org/10.1177/0036850420961607.

Full text

Abstract:

The pipeline length exerts great influence on flame propagation characteristics, Realizable [Formula: see text] model and Premixed combustion model were used to study the influence of pipe length on propane-air explosion flame in open-ended and close-ended pipes. Using the numerical model verified by experiments, the changes of flame structure and flame propagation speed are studied. The result showed that the Realizable model was in good agreement with the experimental results. It also proved that the reflected wave produced a strong interference on the flame front, which promoted the formati

APA, Harvard, Vancouver, ISO, and other styles

38

Sanmiguel-Rojas, E., and T. Mullin. "Finite-amplitude solutions in the flow through a sudden expansion in a circular pipe." Journal of Fluid Mechanics 691 (December 12, 2011): 201–13. http://dx.doi.org/10.1017/jfm.2011.469.

Full text

Abstract:

AbstractResults of three-dimensional numerical simulations of the flow through a sudden expansion in a pipe are presented. The axisymmetric state is known to be stable over the range of Reynolds numbers studied, but recent experimental results suggest bifurcation phenomena. A resolution of this dichotomy between calculation and experiment is provided using imperfections to promote the nonlinear development of asymmetric steady states. These lose stability to disordered motion and the boundary between the steady and time-dependent flows has been established over a range of parameters. Moreover,

APA, Harvard, Vancouver, ISO, and other styles

39

Stro¨ll, H., F. Durst, M. Peric´, J. C. F. Pereira, and G. Scheuerer. "Study of Laminar, Unsteady Piston-Cylinder Flows." Journal of Fluids Engineering 115, no. 4 (1993): 687–93. http://dx.doi.org/10.1115/1.2910200.

Full text

Abstract:

The present paper concerns numerical investigation of a piston-driven, axisymmetric flow in a pipe assembly containing a sudden expansion. The piston closes the larger of the two pipes. The impulsively starting intake flow is the topic of this investigation. Results of numerical calculations and laser-Doppler measurements are presented to provide an insight into the features of the flow. The calculation procedure employed in this study is based on a finite-volume method with staggered grids and SIMPLE-algorithm for pressure-velocity coupling (Patankar and Spalding, 1972). The convection and di

APA, Harvard, Vancouver, ISO, and other styles

40

Donkin, Seth, and David Herrin. "An experimental study of flow-induced noise from perforated pipes." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, no. 1 (2022): 139–50. http://dx.doi.org/10.3397/nc-2022-708.

Full text

Abstract:

An experimental study was performed to understand the generated flow noise by perforated pipes inside of concentric tube resonators. Six perforated pipes with 2% to 45% open areas and hole diameters ranging from 0.8 mm to 4.65 mm are considered. The six concentric tube resonators are compared to a straight pipe and a simple expansion chamber. All cases are tested at ten flow velocities ranging from 0.1 Mach to 0.28 Mach with a 0.02 Mach increment. The effect of the hole diameter and perforation rate on the noise generation and the overall level of the radiated noise is examined. It is found th

APA, Harvard, Vancouver, ISO, and other styles

41

Li, Lin, and David Z. Zhu. "Modulation of transient pressure by an air pocket in a horizontal pipe with an end orifice." Water Science and Technology 77, no. 10 (2018): 2528–36. http://dx.doi.org/10.2166/wst.2018.213.

Full text

Abstract:

Abstract In urban drainage systems, a sudden increase in the flow rate can cause the transition of the flow from open channel to pipe flow, and the entrapment of large air pockets in sewers, which might result in serious geysers and water-hammer like pressure events. This paper presents a numerical analysis of flow processes associated with the pressurization and release of an air pocket in order to study its influence on transient pressure in a horizontal pipe with an end orifice. The influence of the air pocket inside the pipe on the peak pressure can be described in two distinct regimes. In

APA, Harvard, Vancouver, ISO, and other styles

42

González, José, Andrés Meana-Fernández, Iván Vallejo Pérez, and Jesús M. Fernández Oro. "Minor Loss Coefficient for Abrupt Section Changes in a Cylindrical Pipe Using a Numerical Approach." Fluids 9, no. 7 (2024): 152. http://dx.doi.org/10.3390/fluids9070152.

Full text

Abstract:

Abrupt section changes are a classic problem in the study of flow in cylindrical ducts or pipes. For its analysis, there are a wide set of exiting data from previous studies, among which some authors stand out and will be mentioned. Those previous works have been used to obtain reliable results for the resolution of section changes along a pipe, either due to cross area increases or reductions on a 1D basis. It is also known that a numerical 2D axisymmetric simulation (CFD) could find a consistent result compared to experimental data in almost all fluid flow fields. The main novelty of the pre

APA, Harvard, Vancouver, ISO, and other styles

43

Su, Haonan, Huazheng Chen, Rongsheng Zhu, and Qiang Fu. "Effect of reduced diameter pipeline and impeller position on the performance of reactor coolant pump." Journal of Physics: Conference Series 2707, no. 1 (2024): 012036. http://dx.doi.org/10.1088/1742-6596/2707/1/012036.

Full text

Abstract:

Abstract In the reactor coolant pump experiments, there are cases where different impellers are replaced on the same volute for experiments, but due to the different diameter of the impeller inlet, there will be a sudden expansion between the inlet pipeline and the impeller inlet, resulting in a decrease in the efficiency of the pump. In order to solve this problem, a scheme of using an inlet pipe with a reduced diameter structure and changing the position of the impeller was proposed, and based on the three-dimensional incompressible Reynolds N-S equation, the reactor coolant pump device was

APA, Harvard, Vancouver, ISO, and other styles

44

Orel, Vadym, Bohdan Pitsyshyn, and Tetiana Konyk. "HYDRODYNAMICAL INSTABILITY OF NEWTONIAN FLOW BEFORE AN AXISYMMETRIC SUDDEN CONTRACTION." Theory and Building Practice 2021, no. 2 (2021): 32–38. http://dx.doi.org/10.23939/jtbp2021.02.032.

Full text

Abstract:

The sizes of the vortex region before the axisymmetric sudden contraction of the circular pipe at the Newtonian flow have been investigated. Area ratios 0.250 and 0.500 were considered. The sizes of the vortex region have the extreme dependence with a maximum at the transition of the laminar flow into a turbulent flow one. When the Reynolds number at the laminar flow increase, these sizes also increase, and they decrease at the turbulent flow. In both cases, the sizes of the vortex region are proportional to the Reynolds number. A transition region between laminar flow and turbulent flow lies

APA, Harvard, Vancouver, ISO, and other styles

45

Doresic, Tvrtko, and Igor Pazanin. "Curved-pipe flow with boundary conditions involving Bernoulli pressure." Electronic Journal of Differential Equations 2024, no. 01-?? (2024): 63. http://dx.doi.org/10.58997/ejde.2024.63.

Full text

Abstract:

In this article, we study the steady-state flow of the incompressible viscous fluid through a thin distorted pipe with an arbitrary central curve. We prescribe the inflow and outflow boundary conditions involving the Bernoulli pressure with a given pressure drop. Using the multiscale expansion technique with respect to the pipe's thickness, we construct the higher-order asymptotic approximation of the flow given by the explicit formulae for the velocity and pressure. We also perform a detailed error analysis justifying the usage of the proposed solution and indicating its order of accuracy. Fo

APA, Harvard, Vancouver, ISO, and other styles

46

Selvam, Kamal, Jorge Peixinho, and Ashley P. Willis. "Flow in a circular expansion pipe flow: effect of a vortex perturbation on localised turbulence." Fluid Dynamics Research 48, no. 6 (2016): 061418. http://dx.doi.org/10.1088/0169-5983/48/6/061418.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Nejad, A. S., and S. A. Ahmed. "Flow field characteristics of an axisymmetric sudden-expansion pipe flow with different initial swirl distribution." International Journal of Heat and Fluid Flow 13, no. 4 (1992): 314–21. http://dx.doi.org/10.1016/0142-727x(92)90001-p.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Cao, Z., Z. Wang, J. Deng, X. Guo, and L. Lu. "Unsteady friction model modified with compression–expansion effects in transient pipe flow." Journal of Water Supply: Research and Technology-Aqua 71, no. 2 (2022): 330–44. http://dx.doi.org/10.2166/aqua.2022.144.

Full text

Abstract:

Abstract This paper aims to modify the conventional one-coefficient instantaneous acceleration-based (IAB) model for better prediction of unsteady friction behavior. In this work, the energy dissipation caused by viscous stress during fluid volume compression–expansion (CE) was derived from the compressible Navier–Stokes equation. It is found that the energy dissipation term can be expressed by the product of the second-order partial derivative of velocity in space and the second viscosity coefficient. On this basis, a modified IAB-CE model was developed with the energy dissipation term and so

APA, Harvard, Vancouver, ISO, and other styles

49

Zhang, Dawei, and Afshin Goharzadeh. "Effect of Sudden Expansion on Two-Phase Flow in a Horizontal Pipe." Fluid Dynamics 54, no. 1 (2019): 123–36. http://dx.doi.org/10.1134/s0015462819010178.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Koronaki, E. D., H. H. Liakos, M. A. Founti, and N. C. Markatos. "Numerical study of turbulent diesel flow in a pipe with sudden expansion." Applied Mathematical Modelling 25, no. 4 (2001): 319–33. http://dx.doi.org/10.1016/s0307-904x(00)00055-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!