Aerodynamics and Heat Transfer over Solid-Deflectors in Transverse, Staggered, Corrugated-Upstream and Corrugated-Downstream Patterns

Menni, Younes; Aberqi, Ahmed; Chamkha, Ali J.

doi:10.3311/ppme.11972

Cited by 17 publications

(10 citation statements)

References 24 publications

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“…These deflectors direct the fluid flow to circulate in a very small section in the channel duct, to lengthen the trajectory of the fluid, to enhance the heat exchange surface, to force the recirculation zones, to create the turbulence and therefore a successful heat transfer. On the other hand, a comparison of the obtained optimum deflector performance with other deflectors from the literature (Menni et al, 2018a(Menni et al, , 2018b) is shown to highlight the importance of the finning technique for such exchangers.…”

Section: Introductionmentioning

confidence: 87%

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Effects of in-line deflectors on the overall performance of a channel heat exchanger

Menni

Ameur²,

Sharifpur

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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The turbulent convective thermal transfer in channel heat exchangers (CHEs) is studied numerically via the CFD (Computational Fluid Dynamics) method. Deflectors are inserted on the hot bottom walls of the heat channel to enhance the hydrothermal characteristics. Various shapes of in-line deflectors are considered, namely: rectangular (a/b = 0.00), cascaded rectangular-triangular (a/b = 0.25, 0.50, and 0.75), and triangular (a/b = 1.00) shapes. From the obtained results, the inclusion of in-line deflectors with a/b = 0.75 has given the most significant thermal enhancement factor, which was higher than that for a/b = 0.00, 0.25, 0.50, and 1.00 by about 5.36, 5.06, 67.27, and 3.88%, respectively. Also, the in-line cascaded deflector' case (a/b = 0.75) shows an increase in the enhancement factor (η) from 4 to 15.

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Section: Introductionmentioning

confidence: 87%

“…Moreover, the optimum fin case, obtained with a/b = 0.75, is compared with various deflector models (Figure 14) from the literature (Menni et al, 2018a(Menni et al, , 2018b. Under the same simulated conditions, the 0.75cascaded model shows an improvement in the performance over all other deflector cases.…”

Section: Effect Of Shape On Performancementioning

confidence: 99%

Effects of in-line deflectors on the overall performance of a channel heat exchanger

Menni

Ameur²,

Sharifpur

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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“…Heat‐transfer enhancement is one of the most important issues in solar air heater systems to achieve higher thermal efficiency. Based on the previous works which were carried out by the researchers, a significant number of investigations have been done about heat‐transfer enhancement or analyzing the thermal performance of the solar air heaters 15‐28 …”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

2020

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In the present study, the effect of utilizing two different types of baffles in the channel of the solar air heater is investigated numerically. The studied baffles include angled rectangular baffles and angled V-shaped baffles, which are mounted on the bottom and top walls of the duct, respectively. Both considered baffles were evaluated separately which the studied parameter in each section was the angular position of baffles. Finally, the best-obtained results of both sections were compared to each other. The results indicated that in the rectangular model by comparison between 90°model and no baffle, it was found that the pressure drop and average Nusselt number increase 316.67% and 148.15%, respectively at Reynolds number (Re) = 2000. Also, in V-shaped angled baffles, the thermal efficiency of β = 90°, 60°, 45°, and 30°are 27%, 18%, 13% higher than no baffle channel at Re = 2000, respectively. Furthermore, at low Re (about Re below 300), utilizing baffles into the channel had no effect on the thermal efficiency of the system compared to the no baffle channel. However, at high Re, it was found that the highest thermal efficiency occurred in the model of rectangular baffles with an angle of 90°. K E Y W O R D S baffle, heat-transfer enhancement, numerical simulation, solar air heater

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“…The maximum heat transfer enhancement of 11.3 % is observed for 0.4 % nanofluid flow over the WPF with c = 0.51 and h = 6 mm. Other works can be found in the literature, i.e, Menni and Azzi [19], Menni et al [20][21][22][23], Fodor [24], Rábai and Vad [25], Hegedűs et al [26], Füle and Hernádi [27], Goda and Bánhidi [28], Bidar et al [29], Fenyvesi and Horváth [30], and Noghrehabadi et al [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer in Air Flow Past a Bottom Channel Wall-Attached Diamond-Shaped Baffle – Using a CFD Technique

Menni

Chamkha

Zidani

et al. 2019

Period. Polytech. Mech. Eng.

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A computational analysis has been conducted to investigate turbulent flow and convective thermal transfer characteristics in a two-dimensional horizontal rectangular section channel with a hot lower wall-mounted diamond-shaped baffle. The calculations are based on the finite volume method, by means of Commercial Computational Fluid Dynamics software FLUENT, standard k-epsilon turbulence model with QUICK numerical scheme, and the SIMPLE discretization algorithm has been applied. The fluid flow and heat transfer characteristics, i.e., dynamic pressure coefficient, stream function, mean, axial, and transverse velocities, turbulent viscosity, temperature field, skin friction coefficients, local and average Nusselt numbers, and thermal enhancement factor are presented for flow Reynolds numbers based on the aeraulic diameter of the computational domain ranging from 12,000 to 32,000 at constant surface temperature condition along the upper and lower walls. Effect of the diamond configuration of the insulated baffle is studied numerically and the data obtained from this same baffle model are also compared with that of the simple flat rectangular baffle under similar operating conditions. Over the range under investigation, the improvements are found to be around 3.962 and 29.820 times higher than the smooth air channel with no baffle for heat thermal transfer and skin friction factor, respectively. The maximum TEF is around 1.292 at the highest Reynolds number value, Re = 32,000.

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Aerodynamics and Heat Transfer over Solid-Deflectors in Transverse, Staggered, Corrugated-Upstream and Corrugated-Downstream Patterns

Abstract: Abstract

Cited by 17 publications

References 24 publications

Effects of in-line deflectors on the overall performance of a channel heat exchanger

Effects of in-line deflectors on the overall performance of a channel heat exchanger

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

Heat Transfer in Air Flow Past a Bottom Channel Wall-Attached Diamond-Shaped Baffle – Using a CFD Technique

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