Heat transfer enhancement in laminar impinging flows with a non-newtonian inelastic fluid

Chatterjee, Ankit

doi:10.1016/j.jnnfm.2014.06.009

Cited by 14 publications

(3 citation statements)

References 25 publications

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“…In Figures 22 and 23, the behaviour of Nu 0 and Nu avg is shown, respectively, at different nozzle-to-plate distances. Note that Nu avg is the average Nusselt number, which is evaluated only at the so-called impinging zone on the plate 0 ≤ x / D ≤ 2 (Chatterjee, 2014). It can be seen that, for both Nu 0 and Nu avg at H / D > 6.5, their evolution is reversed.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Two-step numerical simulation of the heat transfer from a flat plate to a swirling jet flow from a rotating pipe

Granados-Ortiz

Ortega-Casanova²,

Chen

2019

HFF

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Purpose Impinging jets have been widely studied, and the addition of swirl has been found to be beneﬁcial to heat transfer. As there is no literature on Reynolds-averaged Navier Stokes equations (RANS) nor experimental data of swirling jet flows generated by a rotating pipe, the purpose of this study is to ﬁll such gap by providing results on the performance of this type of design. Design/methodology/approach As the flow has a different behaviour at different parts of the design, the same turbulent model cannot be used for the full domain. To overcome this complexity, the simulation is split into two coupled stages. This is an alternative to use the costly Reynold stress model (RSM) for the rotating pipe simulation and the SST k-ω model for the impingement. Findings The addition of swirl by means of a rotating pipe with a swirl intensity ranging from 0 up to 0.5 affects the velocity profiles, but has no remarkable effect on the spreading angle. The heat transfer is increased with respect to a non-swirling flow only at short nozzle-to-plate distances H/D < 6, where H is the distance and D is the diameter of the pipe. For the impinging zone, the highest average heat transfer is achieved at H/D = 5 with swirl intensity S = 0.5. This is the highest swirl studied in this work. Research limitations/implications High-fidelity simulations or experimental analysis may provide reliable data for higher swirl intensities, which are not covered in this work. Practical implications This two-step approach and the data provided is of interest to other related investigations (e.g. using arrays of jets or other surfaces than flat plates). Originality/value This paper is the first of its kind RANS simulation of the heat transfer from a flat plate to a swirling impinging jet flow issuing from a rotating pipe. An extensive study of these computational fluid dynamics (CFD) simulations has been carried out with the emphasis of splitting the large domain into two parts to facilitate the use of different turbulent models and periodic boundary conditions for the flow confined in the pipe.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Two-step numerical simulation of the heat transfer from a flat plate to a swirling jet flow from a rotating pipe

Granados-Ortiz

Ortega-Casanova²,

Chen

2019

HFF

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“…Homogeneous-heterogeneous reaction effect on stagnation-point flow past a stretching surface was illustrated by Bachok et al [25]. Chatterjee [26] studied the steady axisymmetric Carreau fluid jet flow through an impinging surface. Viscoelastic fluid-flow past a saturated porous medium was analyzed by Delenda et al [27].…”

Section: Introductionmentioning

confidence: 99%

Heat and mass transfer in 3-D MHD Williamson-Casson fluids flow over a stretching surface with non-uniform heat source/sink

et al. 2019

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A mathematical model has been proposed for investigating the flow, heat, and mass transfer in Williamson and Casson fluid-flow over a stretching surface. For controlling the temperature and concentration fields we considered the space and temperature dependent heat source/sink and homogeneous-heterogeneous reactions, respectively. Numerical results are carried out for this study by using Runge-Kutta based shooting technique. The effects of governing parameters on the flow, heat and mass transfer are illustrated graphically. Also computed the skin-friction coefficients for axial and transverse directions along with the local Nusselt number. In most of the studies, homogeneous-heterogeneous profiles were reduced into a single concentration equation by assuming equal diffusion coefficients. For the physical relevance, without any assumptions we studied the individual behavior of the homogeneous-heterogeneous profiles. It is found that the rate of heat and mass transfer in Casson fluid is significantly large while equated with the heat and mass transfer rate of Williamson fluid.

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“…Uma et al [33] analyzed combined radiation and Ohmic heating effects on MHD free convective visco-elastic fluid flow past a porous plate with viscous dissipation. Chatterjee [34] investigated on heat transfer enhancement in laminar impinging flows with a non-Newtonian inelastic fluid. Tarun et al [35] studied Laminar natural convection of power-law fluids in a square enclosure submitted from below to a uniform heat flux density.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Solutal Buoyancy Effect on MHD Boundary Layer Flow of a Visco-Elastic Fluid Past a Porous Plate with Varying Suction and Heat Source in the Presence of Thermal Diffusion

Raju¹,

Gss²

2015

J Appl Computat Math

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Nomenclature C l Species concentration D Molecular diffusivity Gr Grashof number of heat transfer K 1 Permeability of the medium k Thermal diffusivity Rc Elastic parameter Nu Nusselt number S Heat source parameter Sh Sherwood number T Non-dimensional temperature t Non-dimensional time u Non-dimensional velocity v o Constant suction velocity y Non-dimensional distance along y-axis Ԑ A small positive constant β Volumetric coefficient of expansion for heat transfer τ Density of the fluid β 1 Volumetric coefficient of expansion with species concentration S o Frequency of oscillation υ Kinematic coefficient of viscosity σ Electrical conductivity ω Non-dimensional frequency of oscillation C Non-dimensional Species concentration Gc Grashof number for mass transfer g Acceleration due to gravity Kp Porosity parameter M Magnetic parameter B 0 Magnetic field of uniform strength

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Heat transfer enhancement in laminar impinging flows with a non-newtonian inelastic fluid

Cited by 14 publications

References 25 publications

Two-step numerical simulation of the heat transfer from a flat plate to a swirling jet flow from a rotating pipe

Two-step numerical simulation of the heat transfer from a flat plate to a swirling jet flow from a rotating pipe

Heat and mass transfer in 3-D MHD Williamson-Casson fluids flow over a stretching surface with non-uniform heat source/sink

Thermal and Solutal Buoyancy Effect on MHD Boundary Layer Flow of a Visco-Elastic Fluid Past a Porous Plate with Varying Suction and Heat Source in the Presence of Thermal Diffusion

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