Influence of a rectangular baffle on the downstream flow structure

Gajusingh, Shivani T.; Shaikh, Nasiruddin; Siddiqui, Kamran

doi:10.1016/j.expthermflusci.2009.11.011

Cited by 24 publications

(10 citation statements)

References 17 publications

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“…The governing equations were discretized by the second-order upwind differencing scheme and coupling with the SIMPLE algorithm. Gajusingh et al [10] investigated the impact of a rectangular baffle inside a square channel using particle image velocimetry. Huang et al [11] conducted an experimental investigation on the effects of the perforated baffle on heat transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Impact of inclined and perforated baffles on the laminar thermo-flow behavior in rectangular channels

2020

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In this paper, incompressible thermo-flow is simulated for a channel and with and without baffles. A baffle is connected to the channel from different angles. The effect of perforated inclined baffles on the flow pattern and heat transfer in a channel investigated. The computations are based on the finite element method, Galerkin scheme, and Newton-Raphson iterative method have been implemented. The flow regime was assumed to be laminar. Results show that the use of perforated baffles leads to an increase in the Nusselt number and minimized friction factor in comparison to the plain ones. The numerical results are compared with the available solutions in the literature. The defined efficiency of the baffle is obtained for various baffle types, baffle's angle, Reynolds number, and baffle's ratios. The optimum angle of the baffle inclinations was obtained. It was found that perforated baffles demonstrate show superior performance when compared with plain counterparts. Also, there is local heat transfer enhancement at the downstream of the stepped baffle caused by the impinging effect of flow, which is even more significant when baffle height becomes higher or the Reynolds number elevates. Obtained results show that a 135° perforated baffle is a better choice as it enhances the heat transfer with a minimal friction factor.

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Section: Introductionmentioning

confidence: 99%

Impact of inclined and perforated baffles on the laminar thermo-flow behavior in rectangular channels

2020

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“…The impact of the angle of perforation/hole inclination, as well as the station of the hole on the rib, were studied and analyzed experimentally. Using a rectangular type baffle, Gajusingh et al [5] experimentally conducted a study to examine the flow configuration inside a channel of square section. Using a three-dimensional numerical model, Promvonge et al [6] simulated the laminar heat transfer behavior in a square channel with inclined baffles of different flow blockage ratios.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Hydrodynamic Characteristics in Shell-and-Tube Heat Exchangers by Using W-Baffle Vortex Generators

Menni

Chamkha

Ameur³

2020

Period. Polytech. Mech. Eng.

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Improving the hydrodynamic characteristics of STHECs (Shell-and-Tube Heat Exchanger Channels) by using BVGs (Baffle-type Vortex Generators) is among the common passive methods due to their proved efficiency. In this computational investigation, the same method is used to enhance the hydrodynamic behavior of STHECs, by inserting W-shaped Baffle-type Vortex Generators. The numerical model represented by the computational FVM (Finite Volume Method) is used to simulate and analyzed the considered physical model. The fluid used is air, its thermal physical properties are constant, turbulent, incompressible, and its temperature is 300 K at the inlet section of the STHEC. The flow velocity ( Uin ) and atmospheric pressure ( Patm ) are considered as boundary conditions at the entrance (x = 0) and exit (x = L) of the channel, respectively. The results showed that the friction coefficients were related to the pressure, velocity, and Reynolds number values. High values of Re yielded an acceleration of the fluid, resulting thus in increased pressure on the solid walls and augmented friction values.

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“…Gajusingh et al [4] experimentally investigated the impact of a baffle, which acts as a vortex generator, on the heat transfer in a smooth circular tube, using the Particle Image Velocimetry (PIV) technique. Results showed that the turbulent velocities were enhanced by a factor of two to three and the rates of energy production and dissipation were enhanced by more than an order of magnitude when a baffle was inserted in the channel.…”

Section: Introductionmentioning

confidence: 99%

“…Effect of grid size on CFD solution for W/H = 1.321, L/Dh = 5.137, Pi/H = 0.972, h/H = 0.547 at Re = 8.73×104 …”

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confidence: 99%

CFD Simulation of Thermo-Aeraulic Fields in a Channel With Multiple Baffle Plates

Zidani¹

2018

Journal of Thermal Engineering

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In this paper, a two-dimensional incompressible flow of a Newtonian fluid through a horizontal duct of rectangular section, where four flat rectangular baffle plates were inserted and fixed to the top and bottom walls in a periodically staggered manner, is examined and analyzed numerically using the finite volume method by means of commercial CFD software FLUENT 6.3. Researchers consider this situation as a significant issue in the field of heat exchangers, for which the fluid flow characterization, heat transfer and skin friction loss distribution, along with the existence and the extension of possible re-circulations must be determined. The aspect ratio of channel width-to-height, channel length-to-hydraulic diameter, baffle spacing-to-channel height ratio, and blockage ratio of baffle height-to-channel height are fixed at W/H = 1.321, L/Dh = 5.137, Pi/H = 0.972, and h/H = 0.547, respectively. The Reynolds-Averaged Navier-Stokes Equations are the governing flow equations for the problem investigated, with the energy equation. In particular, flow and temperature fields, dimensionless axial velocity profiles, skin friction coefficients, local and average Nusselt numbers, and thermal enhancement factor were presented at constant wall temperature condition along the upper and lower channel walls. The presence of the baffle plates in the whole domain analyzed causes a much high skin-friction loss, f/f0 = 10.829-25.412 but also provides a considerable heat transfer increase in the duct, Nu/Nu0 = 3.623-5.008, depending on the Re values. The enhancement thermal factor for fluid flowing in the baffled channel with larger flow rate is found to be higher than that with smaller flow rate. The enhancement thermal factor augments with the rise of Reynolds number and thus, the highest Reynolds number value, Re = 32,000, provides maximum thermal performance factor, TEF = 1.783. This indicates that the introducing the flat rectangular baffle plates into the flow in a staggered arrangement can improve the heat transfer efficiency inside the channel.

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Influence of a rectangular baffle on the downstream flow structure

Cited by 24 publications

References 17 publications

Impact of inclined and perforated baffles on the laminar thermo-flow behavior in rectangular channels

Impact of inclined and perforated baffles on the laminar thermo-flow behavior in rectangular channels

Enhancement of the Hydrodynamic Characteristics in Shell-and-Tube Heat Exchangers by Using W-Baffle Vortex Generators

CFD Simulation of Thermo-Aeraulic Fields in a Channel With Multiple Baffle Plates

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