Effect of corrugated wall combined with backward-facing step channel on fluid flow and heat transfer

Hilo, Ali Kareem; Talib, Ahmad; Acosta-Iborra, A.; Sultan, M. T. H.; Hamid, Mohd Faisal Abdul

doi:10.1016/j.energy.2019.116294

Cited by 79 publications

(37 citation statements)

References 40 publications

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“…Many authors [Mostafavi et al (2017); Menouer et al (2019)], experimentally and numerically, have shown that the increase in Re causes the existence of two or more flow separation zones at the lower and upper corner walls, which causes a substantial heat loss [Galuppo et al (2017)]. Hilo et al (2020) studied different properties of the hydrothermal phenomena of flow over a suddenly expanded channel. To enhance the rate of HT, many researchers [Rashidi et al (2019); Boudiaf et al (2020)] have investigated the hydrothermal phenomena using nanofluid and stated that the rate of HT can be enhanced using nanofluid instead of base fluid.…”

Section: Nomenclaturementioning

confidence: 99%

Hydrothermal analysis of water-Al2O3 nanofluid flow through a sudden expansion channel with intermediate step

Saha

Das²

2022

KJS publishes peer-review articles in Mathematics, Computer Sci

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This work presents the dynamic behavior of the laminar nanofluid hydrothermal flow through a sudden expansion channel with the variations in the normalized length, height, and pitch to width ratio of the intermediate step. The governing equations have been discretized by means of the finite volume method, and the SIMPLE algorithm has been applied to solve the system of algebraic equations. The effect of variations in the Reynolds number (Re), normalized height (B/C), normalized length (A/C), and step pitch-width ratio (A/B) on the enhancement of heat transfer have been studied. At various values of A/C, A/B and B/C, this work indicates that the average Nusselt number (Nuavg), thermal resistance factor (R), and performance number (PN) increase with the increase in Re. In the case of the hydrothermal flow phenomena, the configuration associated with B/C provides better results than the configurations associated with A/B and A/C. As an important outcome, we see that the presence of intermediate step enhances the average Nusselt number, and thermal resistance factor. This will become very much helpful for various realistic circumstances for triggering additional thermo-mechanical loads on the surface.

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Section: Nomenclaturementioning

confidence: 99%

Hydrothermal analysis of water-Al2O3 nanofluid flow through a sudden expansion channel with intermediate step

Saha

Das²

2022

KJS publishes peer-review articles in Mathematics, Computer Sci

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“…In the review work of Chen et al [ 2 ], basic modeling features and parameters for the flow over BFS were discussed in depth, while different application examples were provided.They considered HT aspects and control design applications with future trends and challenges. Many studies considered the 2D flow over BFS with HT [ 3 , 4 , 5 , 6 ] and 3D aspects of BFS flow were studied in various sources [ 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Coupled Effects of Using Magnetic Field, Rotation and Wavy Porous Layer on the Forced Convection of Hybrid Nanoliquid Flow over 3D-Backward Facing Step

et al. 2022

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In the present study, the effects of using a corrugated porous layer on the forced convection of a hybrid nanofluid flow over a 3D backward facing step are analyzed under the coupled effects of magnetic field and surface rotation. The thermal analysis is conducted for different values of the Reynolds number (Re between 100 and 500), the rotational Reynolds number (Rew between 0 and 2000), the Hartmann number (Ha between 0 and 15), the permeability of the porous layer (the Darcy number, Da between 10−5 and 10−2) and the amplitude (ax between 0.01 ap and 0.7 ap) and wave number (N between 1 and 16) of the porous layer corrugation. When rotations are activated, the average Nusselt number (Nu) and pressure coefficient values rise, while the increment of the latter is less. The increment in the average Nu is higher for the case with a higher permeability of the layer. When the corrugation amplitude and wave number are increased, favorable impacts of the average Nu are observed, but at the same time pressure coefficients are increased. Successful thermal performance estimations are made by using a neural-based modeling approach with a four input-two output system.

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“…Enrichment in heat transfer was detected by influence of aspect ratio (Ar) and highest augmentation was got at Ar=1. Furthermore, influence of corrugated wall combined with BFS passage on heat transfer and fluid flow were numerically studied by Hilo et al [7]. The results revealed that the greatest heat transfer improvement was occurred with trapezoidal corrugation at 4 mm amplitude height and 20 mm pitch diameter and the improved the Nusselt number (Nu) was up to 62% at Reynolds number =5000.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Al2O3-Cu/water nanofluid flow and heat transfer over vertical double forward-facing step

2021

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Turbulent heat transfer and hybrid Al2O3-Cu/nanofluid over vertical double forward facing-stepis numerically conducted. K-? standard model based on finite volume method in two dimensional are applied to investigate the influences of Reynolds number, step height, volume fractions hybrid Al2O3-Cu/nanofluid on thermal performance. In this paper, different step heights for three cases of vertical double FFS are adopted by five different of volume fractions of hybrid (Al2O3-Cu/water) nanofluid varied for 0.1, 0.33, 0.75, 1, and 2, while the Reynolds number different between 10000 to 40000 with temperature is constant. The main findings revealed that rise in local heat transfer coefficients with raised Reynolds number and maximum heat transfer coefficient was noticed at Re=40000. Also rises in heat transfer coefficient detected with increased volume concentrations of hybrid (Al2O3-Cu/water) nanofluid and the maximum heat transfer coefficient found at hybrid Al2O3-Cu/water nanofluid of 2% in compared with others. It?s also found that rise in surface heat transfer coefficient at 1ststep-case 2 was greater than at 1ststep-case 1 and 3 while was higher at 2ndstep-case 3. Average heat transfer coefficient with Reynolds number for all cases are presented in this paper and found that the maximum average heat transfer coefficient was at case 2 compared with case 1 and 3. Gradually increases in skin friction coefficient remarked at 1stand 2ndsteps of the channel and drop in skin friction coefficient was obtained with increased of Reynolds number. Counter of velocity was presented to show the recirculation regions at first and second steps as clarified the enrichment in heat transfer rate. Furthermore, the counter of turbulence kinetic energy contour was displayed to provide demonstration for achieving thermal performance at second step for all cases.

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Effect of corrugated wall combined with backward-facing step channel on fluid flow and heat transfer

Cited by 79 publications

References 40 publications

Hydrothermal analysis of water-Al2O3 nanofluid flow through a sudden expansion channel with intermediate step

Hydrothermal analysis of water-Al2O3 nanofluid flow through a sudden expansion channel with intermediate step

Coupled Effects of Using Magnetic Field, Rotation and Wavy Porous Layer on the Forced Convection of Hybrid Nanoliquid Flow over 3D-Backward Facing Step

Hybrid Al2O3-Cu/water nanofluid flow and heat transfer over vertical double forward-facing step

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