An overview of heat transfer enhancement methods and new perspectives: Focus on active methods using electroactive materials

Leal, L.; Miscevic, Marc; Lavieille, Pascal; Amokrane, Mounir; Pigache, François; Topin, Frédéric; Nogarède, Bertrand; Tadrist, Lounès

doi:10.1016/j.ijheatmasstransfer.2013.01.083

Cited by 177 publications

(59 citation statements)

References 167 publications

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“…In the field of passive heat‐transfer enhancement methods, expanded surfaces such as fin and baffle can be used to improve heat transfer. Heat transfer in channels have always been an important topic for heat‐transfer enhancement and a lot of research has been done over the past few decades 1‐4 . These types of channels have different applications, such as solar air heater in the field of solar energy, 5‐11 cooling electronic equipment, 12 ventilation, 13 and bioengineering 14 …”

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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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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“…The heat transfer enhancement techniques currently in practice include active and passive methods. The active methods require some external power to augment the heat transfer of a system, whereas the passive methods do not need any external power; they are designed tube geometries or wall surfaces and change the working fluid in the system . Vortices are one of the fluid characteristics that can improve heat transfer performance by disrupting and reducing thermal boundary layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on heat transfer and flow characteristics in an alternating cross‐section flattened tube

Rukruang

Chimres

Kaew-On

2018

Heat Trans. Asian Res.

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An experimental and numerical study on convection heat transfer of water flowing through an alternating cross-section flattened (ACF) tube are investigated in this paper. The thermal-fluid characteristics were evaluated by numerical simulation. The test run conditions covered a mass flux of 200 to 800 kg m −2 s −1 , a heat flux of 10 kW/m 2 , and an inlettemperature of 40°C. The results showed that the Nusselt number increased with the increase in mass flux. Moreover, the heat transfer was also affected by the flow characteristics. Vortices were formed at the curved wall, and their intensities were increased along the flow direction. It was also found that the heat transfer and pressure drop were larger than that of the circular tube. However, the thermal performance was greater than the pressure loss penalty.The comparison results showed that the ACF tube had better performance than the circular tube. Further, the details of heat transfer, flow resistance, and fluid behavior were investigated and discussed in this study. K E Y W O R D S alternating flattened (AF) tube, computational fluid dynamics (CFD), flow characteristics, heat transfer enhancement, vortex generation Heat Transfer-Asian Res. 2019;48:817-834.wileyonlinelibrary.com/journal/htj

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“…Active methods and passive methods are the possible ways to enhance the heat transfer rate operationally. Active method includes electro hydrodynamics, jets, sprays, ultrasound waves, synthetic jet heat transfer and high amplitude vibratory motion, while passive method include surface coating, nanoscale coating, nanofluid, hydrodynamic cavitations, turbulence promoters and mixing promoters [1]. Among them, three methods are considered as effective methods to enhance the heat transfer which are (1) Using Nanofluids, (2) Inserting Fluid Tabulators and (3) Roughing the Heat Exchanger Surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanofluid on Heat Transfer Characteristics of Double Pipe Heat Exchanger: Part-Ii: Effect of Copper Oxide Nanofluid

Chavda¹

2015

IJRET

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A nanofluid is a suspension of nano sized particles made up of metal, oxides or carbides of size up to 100 nm in a base fluid of water, ethylene glycol or oil. Recently large numbers of experiments have been are carried out to evaluate the effect of nanofluid in enhancement of the heat transfer rate in various heat exchangers. The heat transfer enhancement using nanofluid mainly depends on type of nanoparticles, size of nanoparticles, shape of nanoparticles, type of base fluid and concentration of nanoparticles in the base fluid. In the present paper, an experimental evaluation has been carried out to determine the effect of various concentration of CuO nanoparticles mixed in water on heat transfer characteristics of double pipe heat exchanger for parallel flow and counter flow arrangement. The volume concentrations of CuO nanofluid prepared by two step method are 0.002 %, 0.003% and 0.004 %. The conclusion derived for the study is that overall heat transfer coefficient increases with increase in volume concentration of CuO nanoparticle compared to water which have been validated by theoretical prediction also.

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An overview of heat transfer enhancement methods and new perspectives: Focus on active methods using electroactive materials

Cited by 177 publications

References 167 publications

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

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

Experimental and numerical study on heat transfer and flow characteristics in an alternating cross‐section flattened tube

Effect of Nanofluid on Heat Transfer Characteristics of Double Pipe Heat Exchanger: Part-Ii: Effect of Copper Oxide Nanofluid

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