Numerical simulation of two-dimensional laminar incompressible offset jet flows

Kanna, P. Rajesh; Das, Manab Kumar

doi:10.1002/fld.1007

Cited by 18 publications

(2 citation statements)

References 33 publications

(36 reference statements)

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“…He confirms that it is difficult to acquire the accurate size and the location of obstacles that do not produce a deflected flow. A Steady-state heat transfer study between a slab and a fluid was carried out experimentally, for a two-dimensional laminar incompressible wall jet over a backward-facing step by Kanna et al,2005. The Nusselt number evolution is determined for several Reynolds number (Re), fluid property (Pr), and solid to fluid conductivity ratio.…”

Section: Fig 1 the Geometry Of The Configurationmentioning

confidence: 99%

Fluid flow of a wall jet impinging a hot obstacle

Kabache

Mataoui

2015

JTST

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A numerical study is performed in order to investigate the effects of the inlet flow structure on the flow and heat transfer characteristics in the reattachment zones over open cavity. Indeed, two inlet flow configurations are tested ; a turbulent wall jet which has a particular structure with two sources of turbulence production (the first is due to the shear flow associated to the inner layer characterized by small scale and second one is of the free shear jet flow with large turbulence scales) and a free boundary layer flow .The inner region of these two flows is similar, but their external regions are extremely different. The separating and reattaching flow phenomena are of particular interest in engineering fields. The numerical results of the analyses the local convective heat transfer. The Nusselt number is more important and decreases immediately downstream the reattachment under the wall jet inlet flow. This detail may be explained from a dynamical point of view; the turbulent energy is more important but in small area around the each reattachment zone. The local Nusselt number increases when the Reynolds numbers augments. The evolution of local Nusselt , depends on incoming flow configuration. For the two configuration of incoming flow (Boundary layer or Wall jet), the distribution of mean Nusselt number is correlated according with some problem parameters.

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Section: Fig 1 the Geometry Of The Configurationmentioning

confidence: 99%

Fluid flow of a wall jet impinging a hot obstacle

Kabache

Mataoui

2015

JTST

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“…Based on computational cost and agreement with experimental data, these authors indicated that standard k-ε model is more appropriate than others. Rajesh Kanna and Das (2005) numerically investigated the influence of offset ratio and Reynolds number of a 2D offset jet on the mean flow parameters such as local maximum velocity decay, entrainment, reattachment length, recirculation eddy structure, and vorticity distribution on the lower wall. Vishnuvardhanarao and Das (2008), using the Reynolds-averaged Navier-Stokes equations and standard k-ε turbulent model, studied the mean flow field and thermal characteristics of 2D offset jets with offset ratio of 3, 7, and 11.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows

Aliha¹,

Afshin²,

Farhanieh³

2016

JAFM

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Using the Yang-Shih low Reynolds k-ε turbulence model, the mean flow field of a turbulent offset jet issuing from a long circular pipe was numerically investigated. The experimental results were used to verify the numerical results such as decay rate of streamwise velocity, locus of maximum streamwise velocity, jet half width in the wall normal and lateral directions, and jet velocity profiles. The present study focused attention on the influence of nozzle geometry on the evolution of a 3D incompressible turbulent offset jet. Circular, square-shaped, and rectangular nozzles were considered here. A comparison between the mean flow characteristics of offset jets issuing from circular and square-shaped nozzles, which had equal area and mean exit velocity, were made numerically. Moreover, the effect of aspect ratio of rectangular nozzles on the main features of the flow was investigated. It was shown that the spread rate, flow entrainment, and mixing rate of an offset jet issuing from circular nozzle are lower than square-shaped one. In addition, it was demonstrated that the aspect ratio of the rectangular nozzles only affects the mean flow field of the offset jet in the near field (up to 15 times greater than equivalent diameter of the nozzles). Furthermore, other parameters including the wall shear stress, flow entrainment and the length of potential core were also investigated.

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A short note on the entrainment and exit boundary conditions

Kanna

Das

2006

Int. J. Numer. Meth. Fluids

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SUMMARYAn attempt is made to ÿnd out the suitable entrainment and exit boundary conditions in laminar ow situations. Streamfunction vorticity formulation of the Navier-Stokes equations are solved by ADI method. Two-dimensional laminar plane wall jet ow is used to test di erent forms of the boundary conditions. Results are compared with the experimental and similarity solution and the proper boundary condition is suggested. The Kind 1 boundary condition is recommended. It consists of zero ÿrst derivative condition for velocity variable and for streamfunction equation, mixed derivative at the entrainment and exit boundaries.

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Numerical simulation of two-dimensional laminar incompressible offset jet flows

Cited by 18 publications

References 33 publications

Fluid flow of a wall jet impinging a hot obstacle

Fluid flow of a wall jet impinging a hot obstacle

Numerical Investigation of Nozzle Geometry Effect on Turbulent 3-D Water Offset Jet Flows

A short note on the entrainment and exit boundary conditions

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