Study of the heat transfer characteristics in turbulent combined wall and offset jet flows

Vishnuvardhanarao, E.; Das, Manab Kumar

doi:10.1016/j.ijthermalsci.2009.02.020

Cited by 34 publications

(7 citation statements)

References 30 publications

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“…However, there are only a few experimental=numerical studies on dual jets for small ORs [39,37]. Therefore, the numerical code developed for a dual jet is validated extensively with the published experimental results for an offset jet.…”

Section: Code Validation and Grid Independent Studymentioning

confidence: 99%

See 1 more Smart Citation

Mean Flow and Thermal Characteristics of a Turbulent Dual Jet Consisting of a Plane Wall Jet and a Parallel Offset Jet

Kumar

2015

Numerical Heat Transfer, Part A: Applications

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The standard high-Reynolds number two-equation k À e model is used to study the flow and thermal characteristics of a dual jet consisting of a plain wall turbulent jet and a parallel turbulent offset jet (hereafter, dual jet). The flow and thermal characteristics are presented in the form of streamlines, mean velocity vector, turbulent kinetic energy, dissipation of turbulent energy, Reynolds stresses, and isothermal contour plots. The variation in local heat flux and local Nusselt number on the bottom wall is also presented. The finite-volumemethod-based SIMPLE algorithm is utilized for understanding the complex nature of flow arising due to a dual jet. The convective flux is discretized using the power-law upwind scheme, while the diffusive term is discretized using the central difference scheme. To study the effect of offset ratio, which is defined as the ratio of height of the jet from the horizontal wall to the width of the jet (nozzle), it is varied between 3 and 15 at an interval of 2. It is noted that the presence of a wall jet in addition to the parallel offset jet has a significant effect on flow and thermal characteristics.

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Section: Code Validation and Grid Independent Studymentioning

confidence: 99%

“…This offset jet was heated, and it impinged onto an adiabatic wall. Thereafter, the thermal characteristics of an offset jet were extensively studied numerically by Vishunuvardhanrao and Das [24,37,38]. They also studied the effect of the thickness of the impinging wall on heat transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Mean Flow and Thermal Characteristics of a Turbulent Dual Jet Consisting of a Plane Wall Jet and a Parallel Offset Jet

Kumar

2015

Numerical Heat Transfer, Part A: Applications

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“…Combined wall and offset jets (WOJ) flow is formed by three relevant zones (Wang and Tan (2007), Vishnuvardhanarao and Das (2009), Kumar and Das (2011), Mondal and Das (2014), Kumar (2015) and Zhiwei (2011)) (Fig. 1).…”

Section: Mean Flow Structurementioning

confidence: 99%

CFD Investigation on the Steady Interaction between an Offset Jet and an Oblique Wall Jet

Hnaien

Marzouk

Kolsi

et al. 2018

JAFM

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In this paper a CFD investigation on the interaction between an offset jet and an oblique wall jet using twodimensional steady RANS equations is performed. This combination is denoted WOJ (Wall Offset jets). Several turbulence models such as the standard k-ω, SST k-ω, standard k-ε, RNG k-ε and realizable k-ε models are tested in the present study. A parametric study is performed to highlight the wall inclination effect on the WOJ flow maximum velocity decay as well as the shear layers spreading. Comparison between combined wall and offset jet (WOJ) and single offset jet (SOJ) flows is also established. Results show that increasing the wall inclination improves the combined wall and offset jets flow spreading. Furthermore, the outer shear layers spreading, is better than the inner shear layers one. Comparing to the combined wall and offset jet flow (WOJ), a better spreading is found in the case of single offset jet flow (SOJ).

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“…Rao and Das [6] studied the heat transfer characteristics of a wall and offset jet by varying the offset ratio. The constant wall temperature and heat flux boundary condition along with Reynolds number (10000-40000 at Prandtl number of 0.71) were considered in this study.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wall Heat Flux on Fluid Flow and Thermal Characteristics of a Turbulent Dual Jet

Kumar¹,

Biswal²,

Gupta³

et al. 2020

MMEP

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In this study, the two-dimensional, incompressible numerical analysis is carried out to understand the turbulent fluid flow physics and thermal characteristics of a dual jet consisting of a wall jet and a parallel offset jet using standard k-RNG turbulence model. The study is carried out to compare the flow and thermal features of the dual jet for an offset ratio of 3, 7 and 9 at different Reynolds numbers in the range of 5,000 to 20,000. The results of the flow field and turbulent behavior of a dual jet are illustrated in the form of temperature contours, velocity vectors, streamlines, and turbulent kinetic energy at different Reynolds number and offset ratio. The effect of offset ratio and Reynolds number on recirculation region and intensity of upper and lower vortices are discussed in detail. The velocity variation along the axial and vertical direction are also discussed.

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Study of the heat transfer characteristics in turbulent combined wall and offset jet flows

Cited by 34 publications

References 30 publications

Mean Flow and Thermal Characteristics of a Turbulent Dual Jet Consisting of a Plane Wall Jet and a Parallel Offset Jet

Mean Flow and Thermal Characteristics of a Turbulent Dual Jet Consisting of a Plane Wall Jet and a Parallel Offset Jet

CFD Investigation on the Steady Interaction between an Offset Jet and an Oblique Wall Jet

Effect of Wall Heat Flux on Fluid Flow and Thermal Characteristics of a Turbulent Dual Jet

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