Applications of Heat Transfer Enhancement Techniques: A State-of-the-Art Review

Bhattacharyya, Suvanjan; Vishwakarma, Devendra Kumar; Roy, Sanghati; Biswas, R. K.; Moghimi, M.A.

doi:10.5772/intechopen.92873

Cited by 8 publications

(2 citation statements)

References 124 publications

(79 reference statements)

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“…In conventional size devices, a heat transfer enhancement can be achieved by increasing the heat-transfer surface area, by using ribs, tapes, turbulators, and vortex generators, etc. [1][2][3][4][5][6][7][8]. In addition to extracting the heat from such compact devices, very high efficiency cooling systems are being developed throughout the world.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

et al. 2022

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The combined effect of a magnetic baffle and a dimple turbulator on the heat transfer and pressure drop is investigated computationally in a mini channel. Fe3O4 magnetic nanofluid is used as a working fluid. The Reynolds number (Re) is varied from 150 to 210 and the magnetic field intensities range from 1200 G to 2000 G. Finite-volume based commercial computational fluid dynamics (CFD) solver ANSYS-Fluent 18.1 was used for the numerical simulations. A laminar viscous model is used with pressure-velocity coupling along with second-order upwind discretization and QUICK scheme for discretizing the momentum and energy equations. The results show that there is an increase of 3.53%, 10.77%, and 25.39% in the Nusselt numbers when the magnetic fields of 1200 G, 1500 G and 2000 G, respectively, are applied at x = 15 mm, as compared to the flow without a magnetic field when the pitch = 10 mm. These values change to 1.51%, 6.14% and 18.47% for a pitch = 5 mm and 0.85%, 4.33%, and 15.25% for a pitch = 2.5 mm, when compared to the flow without a magnetic field in the respective geometries. When the two sources are placed at x = 7.5 mm and 15 mm, there is an increase of 4.52%, 13.93%, and 33.08% in the Nusselt numbers when magnetic fields of 1200 G, 1500 G, and 2000 G are applied when the pitch = 10 mm. The increment changed to 1.82%, 8.16%, and 22.31% for a pitch = 5 mm and 1.01%, 5.96%, and 21.38% for a pitch = 2.5 mm. This clearly shows that the two sources at the front have a higher increment in the Nusselt numbers compared to one source, due to higher turbulence. In addition, there is a decrease in the pressure drop of 10.82%, 16.778%, and 26.75% when magnetic fields of 1200 G, 1500 G, and 2000 G, respectively, are applied at x = 15 mm, as compared to flow without magnetic field when the pitch = 10 mm. These values change to 2.46%, 4.98%, and 8.54% for a pitch = 5 mm and 1.62%, 3.52%, and 4.78% for a pitch = 2.5 mm, when compared to flow without magnetic field in the respective geometries. When two sources are placed at x = 7.5 mm and 15 mm, there is an decrease of 19.02%, 31.3%, and 50.34% in the pressure drop when the magnetic fields of 1200 G, 1500 G and 2000 G are applied when the pitch = 10 mm. These values change to 4.18%, 9.52%, and 16.52% for a pitch = 5 mm and 3.08%, 6.88%, and 14.88% for a pitch = 2.5 mm. Hence, with the increase in the magnetic field, there is a decrease in pressure drop for both the cases and the pitches. This trend is valid only at lower magnetic field strength, because the decrease in the pressure drop dominates over the increase in pressure drop due to turbulence.

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Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

et al. 2022

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“…The heat transfer is applicable in space craft radiators, rotating heat exchangers, pressurized bubble columns, soil and deep bore heat exchangers, commercial blood oxygenators, thermo-acoustic and thermoelectric devices [25]. Since heat transfer includes more complicated operations like metabolic heat generation and warm change due to numerous exogenous connections.…”

Section: Introductionmentioning

confidence: 99%

Time Fractional Analysis of Channel Flow of Couple Stress Casson Fluid using Fick’s and Fourier’s Laws

Ahmad

Haq

Ali

et al. 2021

Preprint

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This study aim to examine the channel flow of a couple stress Casson fluid. The flow is generated due to the motion of the plate at y = o, while the plate at y = d is at rest. This physical phenomenon is derived in terms of partial differential equations. The subjected governing PDE’s are non-dimensionalized with the help of dimensionless variables. The dimensionless classical model is generalized by transforming it to the time fractional model using Fick’s and Fourier’s Laws. The general fractional model is solved by applying the Laplace and Fourier integral transformation. Furthermore, the parametric influence of various physical parameters like Casson parameter, couple stress parameter, Grashof number, Schmidt number and Prandtl number on velocity, temperature, and concentration distributions is shown graphically and discussed. The heat transfer rate, skin friction, and Sherwood number are calculated and presented in tabular form. It is worth noting that the increasing values of the couple stress parameter λ deaccelerate the velocity of Couple stress Casson fluid.

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Augmentation of heat transfer in a microtube and a wavy microchannel using hybrid nanofluid: A numerical investigation

Singh

Bhattacharyya

Paul

et al. 2020

Math Methods in App Sciences

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The paper discusses the numerical investigation involving forced convective heat transfer (HT) in the laminar flow regime is carried out for nanofluid (NF) and hybrid NF (HNF) in a microtube and wavy microchannel. Water‐based Al2O3 NF and water‐based Al2O3‐Ag HNF is studied for this purpose. Reynolds number (Re), temperature, volume fraction, and nanoparticle (NP) size are varied for the analysis at a constant HT rate. Numerical results characterizing the performances of NF and HNF are presented in terms of the local HT coefficient. It is found that with the increase in Reynolds number, volume fraction, and temperature, local HT coefficient is increased. For Reynolds number of 50 and 𝜑 = 3%, a maximum of 11.03% increase in HT coefficient is obtained for microtube, while for the same case, a maximum of 10.16% is found for wavy microchannel. Comparison of NF and HNF reveals superior HT property of the later. However, microtube exhibits better HT coefficient than the wavy channel at constant heat flux, length, and area.

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Applications of Heat Transfer Enhancement Techniques: A State-of-the-Art Review

Cited by 8 publications

References 124 publications

Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

Effect of Magnetic Baffles and Magnetic Nanofluid on Thermo-Hydraulic Characteristics of Dimple Mini Channel for Thermal Energy Applications

Time Fractional Analysis of Channel Flow of Couple Stress Casson Fluid using Fick’s and Fourier’s Laws

Augmentation of heat transfer in a microtube and a wavy microchannel using hybrid nanofluid: A numerical investigation

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