Enhancement of the Hydrothermal Characteristics of Fin-and-Tube Heat Exchangers by Vortex Generators

Sahel, Djamel; Ameur, Houari; Karima, Alem

doi:10.2514/1.t6023

Cited by 22 publications

(8 citation statements)

References 45 publications

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“…Sahel et al [10] investigated fin-and-tube heat exchangers in two sections: the first section examined the effects of the inclination angle of the tube between 0-90 degrees, and the second section optimized the best case determined in the first section by placing flat VGs in the heat exchanger. Finally, the optimization was conducted by changing the number and position of VGs on the upper region of the tubes.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Length and Amplitude of Sinusoidal Wavy Vortex Generators on the Heat Transfer Rate, Pressure Drop, and London Factor in Compact Heat Exchangers

Barati

Nimafar

Salehi

2023

j. of mech. mater. and mech. res.

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Compact heat exchangers (CHE) improve the heat transfer rate with lighter weight and lower volume than other counterparts. An important point in CHEs is their higher pressure drop relative to conventional heat exchangers. This study aims to investigate the heat transfer rate and pressure drop in some proposed models of these heat exchangers with/without vortex generators (VGs) in different cases. A hot fluid of temperature 350°C flowing through tubes and a cold fluid of temperature 300°C circulating inside the shell are assumed. To this end, several VGs with sinusoidal wavy shapes are designed and examined with different amplitudes of the sine wave and different lengths to determine the effects of these parameters on the heat transfer rate of tubes and pressure drop along the heat exchanger length. In the 2D steady-state laminar fluid flow, governing equations are discretized using the finite element method and analyzed for Reynolds numbers 400 to 1000 in the ANSYS software. Finally, with a 5.06% increase in the Nusselt number, the sinusoidal VGs of amplitude 1 and length 6 mm quantitatively indicated the best performance in terms of the heat transfer rate and pressure drop (London factor) among the studied cases.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Length and Amplitude of Sinusoidal Wavy Vortex Generators on the Heat Transfer Rate, Pressure Drop, and London Factor in Compact Heat Exchangers

Barati

Nimafar

Salehi

2023

j. of mech. mater. and mech. res.

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“…So, in the past 20 years, much work has been carried out numerically and experimentally to understand the thermohydrodynamic phenomena. One of the efficient passive methods for heat transfer augmentation is utilizing inserts (as turbulator or swirl generators) in the channels to produce vortex flows like twisted tape [1][2][3][4][5][6] , conical ring, 7 wire coil, 8 corrugated channel, 9,10 extended surface, [11][12][13] rib, 14 baffle. [15][16][17][18][19][20] Also, there are some works in which various kinds of inserts created unique geometries for heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

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

Salhi¹,

Ajarostaghi

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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“…Gherasim et al [26,27] experimentally investigated the frictional factor and Nusselt number in a HE then extended it numerically for the assessment of laminar and two equation turbulent models by comparing the simulation results with the experimental ones. The deposition of unwanted material is easy to be clean which decreased the heat transfer rate [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of thermal performance of heat exchanger: Different plate structures and fluids

2022

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Due to compact size, high power density, low cost and short construction time, the Small Modular Reactors (SMRs) are considered as one of the candidate reactors, in which the power generation system is important with a compact heat exchanger for modular construction. Therefore, the effect of plate structure and nature of the working fluid on the thermal performance of Plate Heat Exchanger (PHE) are analyzed for the design of compact and efficient heat exchanger. The heat transfer rate, temperature counters, velocity vectors and pressure drop have been optimized and investigated using FLUENT. The Nusselt number has been calculated for the corrugated and flat PHE to validate the convective heat transfer. The numerical results are agreed well with correlation within deviation of ~ 5-7%. The performance of heat exchanger can be improved by controlling the mass flow rate and temperature of working fluid. The corrugation PHE increases the heat transfer rate 20 % and effectiveness 23 %, respectively, as compare to flat PHE when the working fluid is water. In the case of air, heat transfer rate and effectiveness are about 10 % and 9 %, respectively. The results show that the corrugated PHE is more effective than the flat PHE because corrugation pattern enhances the turbulence of fluids, which further increase heat transfer rate and coefficient. The selection of the working fluid and structure of the plate must be considered carefully for efficient and compact design of heat exchanger.

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Enhancement of the Hydrothermal Characteristics of Fin-and-Tube Heat Exchangers by Vortex Generators

Cited by 22 publications

References 45 publications

Investigation on the Effect of Length and Amplitude of Sinusoidal Wavy Vortex Generators on the Heat Transfer Rate, Pressure Drop, and London Factor in Compact Heat Exchangers

Investigation on the Effect of Length and Amplitude of Sinusoidal Wavy Vortex Generators on the Heat Transfer Rate, Pressure Drop, and London Factor in Compact Heat Exchangers

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

Numerical analysis of thermal performance of heat exchanger: Different plate structures and fluids

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