Interaction between two non-parallel jets in a confined circular duct.

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Cold Flow Modeling was used to study mixing and interaction between two nonparallel jets confined in a cylindrical duct using flow visualization techniques. This study has direct relevance to time kilns where Non-Condensable Gases (NCG) are burned in a separate burner. Craya-Curtet number (Ct), Reynolds number (Re) and angle of the NCG nozzle with respect to the duct axis (alpha) were used to characterize the effect of a separate NCG burner on flame patterns in time kilns. Of the three parameters considered, alpha is the most dominant in determining the mixing and interaction between the two jets. The lateral expansion rate of the jets decreased with either an increase in Ct or an increase in their respective Reynolds numbers. The two jets were found to have longer recirculation zones than corresponding single jets. Re, Ct and alpha are expected to be important parameters in determining flame shape and temperature.

The Physical Object
Pagination112 leaves.
ID Numbers
Open LibraryOL19747210M
ISBN 100612914089

The mean characteristics of the flow due to mixing of two non-axial plane jets in a confined passage, were reported previously by Manjunath et al.

Details Interaction between two non-parallel jets in a confined circular duct. FB2

(Exp. Fluids 11 (), 17–24), as part I. In this paper, the turbulence characteristics of the flow are discussed. The various components of the Reynolds stress tensor are reported for the four inlet angles considered, Cited by: 5.

The present study deals with the static pressure and mean velocity fields generated due to the mixing of two plane turbulent jets in a confined passage.

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Four different impingement angles, viz., 15, 30, 45 and 60 degrees, have been investigated. It is found that the inlet angle is the most important parameter governing the extent of the central recirculation Cited by: 5.

The present study deals with the experimental investigations of static pressure and mean velocity fields obtained as a result of the interaction of two plane turbulent jets at impingement angles of α equal to 30° and 45°, with an additional central jet in a confined space.

The investigation is carried out for the velocity ratios of U c/U o=, andwhere U c Author: B. Lakshmana Gowda, S. Sankaran, R. Natarajan. The interaction of two plane jets inclined at various angles in a confined space were investigated by Man-junath et al.1,2.

Gowda et al.3 have studied the mean and turbulent characteristics of two non-axial plane turbulent jets with a central jet of constant width ratio w/2B= (w=central jet width; B=half width of theAuthor: B H Lakshmana Gowda, T S Dhanasekaran, T Sundararajan, R Natarajan Natarajan.

Interaction of a circular turbulent jet with a flat target Article in Journal of Applied Mechanics and Technical Physics 48(1) January with 3 Reads How we measure 'reads'. The interaction of a turbulent round jet with the free surface was investigated experimentally.

Flow visualization, free-surface curvature measurements and. The interaction of two parallel plane jets of different velocities is studied by flow visualization and PIV measurement to examine the influence of velocity ratio on the development ofjets in the initial region.

It is found that the parallel plane jets develop toward the high velocity side and the jet width is reduced with a decrease in the jet velocity by: The Interaction of Jets with Crossflow Article in Annual Review of Fluid Mechanics 45(1) January with Reads How we measure 'reads'Author: Krishnan Mahesh.

When an incompressible jet strikes an inclined fixed plate at speed Vj, as shown below, it breaks into two jets at 2 and 3 of equal velocity V = Vj but unequal fluxes αQ at section 2 and (1 −α)Q at section 3, α being a fraction and Q being the total volume flowrate.

Three-dimensional stability in the wake of a confined circular cylinder, with transverse oscillation. the effect of semi-circular blockages on the laminar two-dimensional flow between two flat plates, Prediction of flow/acoustic interactions using vortex models: duct with baffles.

In: Computational Fluid Dynamics, G. de Vahl Davis and C. Koopman and Sparrow noted that there are two types of interaction between the jets in the multiple-jets system.

The first type was the interaction between adjacent jets prior to impingement on the surface. The second type was the collision of two wall jets, which were generated after by: OF JETS IN CROSSFLOW CONFINED IN A NARROW SQUARE DUCT H. Wang, L.

Araneo, A. Coghe @ Dept. of Energy, Politecnico di Milano, Bovisa, Via Lambruschini,Milano, Italy Abstract The flow field resulting from injecting a turbulent jet into a steady cross-flow confined in a square duct with relative small size has been.

TURBULENT FLUID FLOW VISUALISATION IN AN AXI-SYMMETRIC CIRCULAR DUCT A CFD study was performed to analyze the mixing potential of opposed rows of jets injected into a confined cross flow in a. The effect of interaction between jets in multi jets tends to reduce both segment and average segment Nusselt numbers for any jet of multi jets compared with condition of single jet.

Motivated by the problem of jet–flap interaction noise, we study the tonal dynamics that occurs when an isothermal turbulent jet grazes a sharp edge. We perform hydrodynamic and acoustic pressure measurements to characterise the tones as a function of Mach number and streamwise edge by: Two parallel plane jets with various jet spacing between two jet centerlines, defined as s, are numerically simulated using lattice Boltzmann Reynolds number based on jet-exit-width d is set to be R e = 56 and the jet spacing is set to be less than or equal 8 times the jet-exit-width.

Description Interaction between two non-parallel jets in a confined circular duct. EPUB

Generally, there exist three distinct regions, a converging region, a merging region and Author: Li-Qing Zhao, Xiao-Chun Wang. More recently, San and Shiao have examined the effects of jet plate size and plate spacing for mounting removable bars between an end plate mounted flush with a jet exit and a target plate on the heat transfer characteristics for a confined circular air jet vertically impinging on a flat plate.

They showed the effects of the jet plate width-to Cited by: 8. Certification Specifications. and. Acceptable Means of Compliance. for. Large Aeroplanes. CS Amendment 12 March 1. For the date of entry into force of this Amendment, kindly.

refer to Decision //R in the. Official Publication. of the Agency. Annex to ED Decision //R Consolidated version for information. The experimental studies show that the resulting jet length in the confined space can be divided into three zones (Fig.

).In the first zone, there is an expansion of the resulting jet boundaries. The length of this zone (X I) depends upon the relative momentum (I 02 /I 01) value and the relative distance (l i / Ar) between the directing nozzles, where A r is the room vertical.

The interaction between the jet and the crossflow is analysed in three contrasted situations corresponding to different values of the jet outlet velocity U 0. We predict and observe an increase of the jet deflection during the acceleration phase and a competition between drag and acceleration during the by: 9.

For information, write to the Society for Industrial and Applied Mathematics, Market Street, Philadelphia, PA SIAM Spectral methods involve seeking the solution to a differential equation in terms of a series of known, smooth functions.

Purchase Engineering Turbulence Modelling and Experiments 6 - 1st Edition. Print Book & E-Book. ISBN  Abstract. In this chapter major principles, methods and possibilities of control of free turbulent shear flows are explained. In the first part we present and summarise general characteristics of free shear flows and the whys and hows of their by: This volume comprises the proceedings of the 42nd National and 5th International Conference on Fluid Mechanics and Fluid Power held at IIT Kanpur in December, The conference proceedings encapsulate the best deliberations held during the conference.

The diversity of participation in the. The interaction between viscous fingering and wrinkling in elastic-walled Hele-Shaw cells. Optimal perturbations of non-parallel wakes and their stabilizing effect on the global instability.

The vortex shedding around four circular cylinders in an in-line square configuration. Feifei Tong, Liang Cheng. The pipe consists of two sections of diameters 20 cm and 10 cm with a smooth reducing section that connects them.

The pressure difference between the two pipe sections is measured by a water manometer. Neglecting frictional effects, determine the differential height of water between the two pipe sections.

Take the air density to be kg/m3. Book Search tips Selecting this option will search all publications across the Scitation platform Selecting Modulated wall motion approach for augmenting slug flow heat transfer between two micro-parallel plates.

Vivekanand and V. K Vortex-induced vibrations of a confined circular cylinder for efficient flow power extraction. Huber and Viskanta conducted experiments on arrays of axisymmetric confined air jets.

Their results showed that interference before impinging zone, rather than wall jet interaction or fountain effects, caused more Nusselt decrement. Lee et al. studied numerically and experimentally mode of unsteadiness for laminar impinging slot jets.

Empirical Cited by: Exploration of a horizontal confined impinging heated jet using both experimental and numerical methods Mark Fahey #, Sarah J Wakes* and Christopher T Shaw + # Kahu Technologies, Mosgiel, New Zealand, @ *Department of Design Studies, University of Otago, PO Dunedin,Cited by: 1.

Experimental Study of Heat Transfer Characteristics due to Confined Impinging Two-Dimensional Jets Koichi Ichimiya Department of Mechanical System Engineering Yamanashi University, Yamanashi, Japan Nobuo Hosaka Honda Technical Research Institute Ltd., Tochigi, Japan Experimental results are presented for characteristics of impingement heat transfer caused by three slot by:.

surface area. From Newton’s second law, a force balance in the x- and z- directions gives (3–3a) (3–3b) where ris the density and W mg rg x z/2 is the weight of the fluid element.

Noting that the wedge is a right triangle, we have x l cos uand z l sin u. Substituting these geometric relations and dividing Eq. 3–3aFile Size: 1MB.The structure of the present book reflects the variety of topics treated within the conference i.e.

Jets, Wakes, Separated flows, Vehicle aerodynamics, Wall-bounded and confined flows, Noise, Turbomachinery flows, Multiphase and reacting flows, Vortex dynamics, Energy-related flows and a section dedicated to Numerical analyses.This book discusses the physical mechanisms that drive counterflows, examining how they emerge, develop, become double and multiple counterflows and comprise both global and local circulations.

Counterflows play an important role in nature and technology. A natural example is the Gulf Stream and the opposite flow in the ocean by: 9.