Combined Heat and Mass Transfer of Fluid Flowing through Horizontal Channel by Turbulent Forced Convection

Salhi, Jamal Eddine; Amghar, Kamal; Bouali, Hicham; Salhi, Najim

doi:10.1155/2020/1453893

“…The channel and rib geometry is indicated in Figure 6. Salhi et al [14] made a numerical investigation study to examine heat transfer performance affection the inclination angle of the involved baffles in a two-dimensional horizontal channel. The baffles are mounted on lower and upper walls of the channel and inclination angles are 40°, 55° and 65°.…”

Section: Solid Ribs Blocks and Bafflesmentioning

confidence: 99%

Heat transfer enhancement using different types of turbulators on the heat exchangers

Çelik

¹

,

Erbay

²

2021

Journal of Thermal Engineering

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Energy-saving and heat transfer enhancement considerations are more crucial due to nearly running out energy resources and ensuring the sustainability of nature. The heat exchangers are one of the main components and directly affect the thermal efficiency of the systems. To enhance the heat transfer rate, the fin and plate structure is widely used. Various vortex generators may be involved generally on the surface of fins, like ribs, baffles, delta winglets, and perforations. Turbulators make the heat transfer performance better significantly but increase the friction of the fluid on the contacting surfaces and cause the pressure drop-down which depends on thermal properties of the fluid characteristics. This paper presents general protrusion vortex generators overview to heat transfer augmentation with pressure loss as an extensive literature review. The correlations are derived in terms of some parameters of turbulators like; angle, pitch, shape and combinations of an array. The target of this study is consolidating the verified outputs of the literature and support the increasing thermal performance of the heat exchangers. In conclusion, two tables are made for the first time and summarizing the crucial features of solid, perforated baffles/blockages and winglet turbulators, mentioned in the literature are presented. Obstacles such as winglets and vortex generators are used commonly to increase the heat transfer rate per unit volume for finned to tube exchangers with various types. In order to augment the heat transfer, the design parameters of important consideration are attack of angles, height and array structure in both laminar and turbulated fluid characteristics. Involving perforation forms on the surface may be used for winglets with variable angles both decrease the pressure loss and increase the heat transfer performance.

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“…analyzed the flow structure and thermal characteristics in the tubular hydrothermal exchanger (THE) type after being fitted with baffles. They reported that the thermal performance of a heat exchanger and the reduction of pressure loss are possible by introducing inserts, particularly integrated baffles with circular perforations 32 . studied the role of baffle orientation in modifying the flow structure and heat transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the thermal performance of a heat exchanger and the reduction of pressure loss are possible by introducing inserts, particularly integrated baffles with circular perforations. 32 studied the role of baffle orientation in modifying the flow structure and heat transfer characteristics. The deflectors in the studied model were chosen to be transverse and orientable.…”

Section: Introductionmentioning

confidence: 99%

“…Ismail et al (2013) used longitudinally perforated solid rectangular fins to study the turbulent thermal convection in a heat exchanger and were able to show that circularly perforated fins offer a good improvement in heat transfer rate and lower the pressure drop. Again, Salhi et al 32 conducted a three‐dimensional numerical simulation to study the effect of the cross‐sectional space between the perforations on the hydrodynamic and thermal behavior of the fluid flow in a rectangular cross‐section channel with solid and hot baffles 34 . numerically studied the improvement of heat transfer in a tubular heat exchanger using a porous medium 35 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Turbulence and thermo‐flow behavior of air in a rectangular channel with partially inclined baffles

Salhi¹,

Ajarostaghi

²

,

Zarrouk³

et al. 2022

Energy Science & Engineering

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In this paper, the thermal performance improvements of a heat removal system like an electronic system have been analyzed. The studied case is a horizontal channel in which two partially inclined baffles are attached with variable height and number. The channel is crossed by a forced convective flow of a cooling fluid (air). This numerical work evaluates the influences of the height and number of the baffles on the enhancement of the heat transfer rate. The mathematical model of this system is composed of nonlinear partial equations that the analytical solution for them is very complex, hence the need for numerical analysis is mandatory with the aid of a finite volume method. Accordingly, The numerical results are presented in axial and transverse velocity, temperature, local and average Nusselt number, local friction coefficient, pressure drop, heat transfer rate, and turbulence kinetic energy. The results revealed that it is possible to improve the thermal performance of the considered system by adopting designs that allow the maximum heat transfer rate with the minimum energy loss. In addition, results show that at the lowest Reynolds number (Re = 10,000), as the height of baffles rises from 0.01 to 0.03 m (growth by 200%), the heat transfer rate augments about 59.09%. Moreover, at the highest evaluated Reynolds number (Re = 87,300), by increasing the height of baffles up to 200%, the heat transfer rate increases by approximately 50.53%. Furthermore, employing a higher number of baffles leads to more heat transfer rates and a significant pressure drop.

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“…There are many published works about heat transfer and flow mechanisms, which are significant knowledge, for the heat exchangers and engineering devices [1][2][3][4][5][6][7][8][9]. The examples for the heat transfer improvement in various types of the heat exchangers with passive techniques of both numerical and experimental investigations are as follows.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Potentiality and Flow Behavior in a Square Duct Fitted with Double-Inclined Baffles: A Numerical Analysis

Boonloi

¹

,

Jedsadaratanachai

²

2021

Modelling and Simulation in Engineering

0

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Numerical analysis of heat transfer mechanisms and flow topologies for the heat exchanger square channel (HESC) installed with the double-inclined baffles (DIB) is reported. The main objective of the present research is to study the influences of DIB height to duct height ( b / H = 0.05 – 0.30 ), DIB distance to duct height ( P / H = 1 – 1.5 ), and flow attack angle ( α = 30 ° and 45 ° ) on the flow topologies, heat transfer features, and thermal performances. The Reynolds numbers (based on the entry HESC around 100–2000) are analyzed for the present problem. The numerical models of the HESC installed with the DIB are solved with finite volume method (commercial code). The simulated results of the HESC installed with the DIB are reported in forms of flow topologies and heat transfer characteristics. The Nusselt numbers (Nu), friction factors ( f ), and thermal enhancement factors (TEF) of the HESC placed with the DIB are offered. As the numerical results, it is seen that the DIB produces the vortex streams and impinging streams in all cases. The vortex streams and impinging streams disturb the thermal boundary layer on the HESC walls that is a key motive for the growth of heat transfer rate. The best TEF of the HESC installed with the DIB is about 3.87 at P / H = 1 , α = 30 ° , Re = 2000 , and b / H = 0.15 . Additionally, the TEF contours, which help to design the HESC inserted with the DIB, are performed.

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Combined Heat and Mass Transfer of Fluid Flowing through Horizontal Channel by Turbulent Forced Convection

Cited by 16 publications

References 25 publications

Heat transfer enhancement using different types of turbulators on the heat exchangers

Heat transfer enhancement using different types of turbulators on the heat exchangers

Turbulence and thermo‐flow behavior of air in a rectangular channel with partially inclined baffles

Heat Transfer Potentiality and Flow Behavior in a Square Duct Fitted with Double-Inclined Baffles: A Numerical Analysis

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