Experimental investigation of heat transfer and pressure drop characteristics of non-Newtonian nanofluids flowing in the shell-side of a helical baffle heat exchanger with low-finned tubes

Tan, Yunkai; He, Zhenbin; Xu, Tao; Fang, Xiaoming; Gao, Xuenong; Zhang, Zhengguo

doi:10.1007/s00231-017-2015-6

Cited by 13 publications

(6 citation statements)

References 27 publications

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“…For a helically baffled heat exchanger, Tan et al 34 explored the cooling capacity of non-Newtonian nanofluids. Compared with the base fluids, the non-Newtonian nanofluids provided the best performance in terms of heat transfer coefficient, Nusselt number, and pressure drop.…”

Section: Nanofluid Transport Under Laminar Flow Regimementioning

confidence: 99%

Advances of nanofluids in heat exchangers—A review

Menni

Chamkha

Ameur³

2020

Heat Trans

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Recently, many researchers have focused on their studies on the analysis of nanofluid flows due to their participation in the enhancement of heat transfer rates in industrial processes. The ordinary fluids, such as water, mineral oils, and so on, are known for their low thermal conductivity in heat transfer processes. A significant enhancement in the thermal properties of ordinary fluid may be obtained by adding nanoparticles having a diameter of less than 100 nm or suspension of fibers. Better spreading, wetting, dispersion, and stability and with acceptable viscosity are the main advantageous properties of nanofluids on a solid surface. The nanofluids are encountered in various thermal engineering systems such as in heat exchangers, refrigeration, thermal management of fuel cells, cooling of nuclear reactors, microelectromechanical systems, and others. In particular, the thermal conversion is known as a great application of nanotechnology, and many studies have been achieved with such fluids in heat exchangers. Therefore, this paper aims to present a global insight into the different applications of nanofluids in various heat exchangers, that is, heat pipe and plate-fin heat exchangers. All research works have been summarized into three main parts: laminar, transition, and turbulent nanofluid flow regimes.

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Section: Nanofluid Transport Under Laminar Flow Regimementioning

confidence: 99%

Advances of nanofluids in heat exchangers—A review

Menni

Chamkha

Ameur³

2020

Heat Trans

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“…Since FCSHE 45° fin orientation enabled mounting of more number of fins on the coil surface than FCSHE 90°, the resulting surface area of contact to hot air was higher. The higher surface area enabled higher exergy [33][34][35]. Thus it can be concluded that the synergetic effect of the nanofluid and circular fin with proper orientation will enhance the rate of heat transfer.…”

Section: Effect On Nusselt Numbermentioning

confidence: 93%

Thermal performance enhancement studies on a circular finned coil-in-shell heat exchanger using graphene oxide nanofluid

Rai¹,

Hegde²

2020

SN Appl. Sci.

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The objective of this study is to investigate the effect on heat transfer augmentation by the combined effect of circular fins directly attached to the helical surface of the coil in two different orientations (45° and 90°) and Graphene Oxide nanofluid as a heat transport agent, in a coil-in-shell heat exchanger. The attached circular fins not only act as turbulators on the shell side but could also add to heat transfer from the hot side to the cold side, by a combined mechanism of conduction and convection. The experiment is conducted at constant heat flux, with the cold nanofluid in the coil side and hot air in the shell side. Test runs are taken by varying hot air velocities from 1 m/s to 5 m/s, keeping fixed volume concentration of nanofluid (0.05-0.15%) and flow rate (500 ≤ Re ≤ 5500) one at a time. Experimental results indicated significant enhancement in heat transfer performance for the finned configuration. For 90º and 45º fin orientation-0.15% volume concentration of nanofluid, the maximum heat transfer increase is by 78.46%, and 82.22%, Nusselt number increase is by 32.57%, 60.79% respectively, at a hot air velocity of 3 m/s. The coil side pressure drop and friction factor increased to 32.72% and 24.64% for 0.15% GO nanofluid when compared to pure water at the maximum flow rate. The thermal-hydraulic performance improvement is nearly twofold with 45º fin orientation-GO nanofluid combination.

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“…Jiang et al [5] performed numerical simulations for the helical baffles heat exchanger and the segmental baffles heat exchanger with component clearance to reveal the features of leakage streams and their effect on heat exchanger performance. Tan et al [6] presented the experimental work carried out to compare the shell-side heat transfer coefficients, Nusselt number, pressure drops and friction coefficients of non-Newtonian nanofluids to those of non-Newtonian base fluid in a helically baffled heat exchanger with low finned tubes for test fluid cooling using water as a coolant. Zhang et al [7] provided experimental results for the heat transfer performance and the pressure drop characteristic of the shell sides enhanced by helical fins and vortex generators.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Flow over a Detached V-Shaped Rib in a Rectangular Channel

Chamkha¹,

Menni²

2020

MMEP

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In this paper, a new channel model was designed. The study aims to improve the dynamic and thermal behavior of a turbulent flow of hydrogen by introducing a new complex rib between its hot upper and lower walls. The new shape of the rib allows destabilizing flow with the creation of very strong recirculation cells on its back sides, mixing well fluid in the entire interior of the channel, thus a high thermal transfer. The Reynolds averaged Navier-Stokes (RANS) equations, along with the standard k-ε turbulence model and the energy equation, are used to control the channel flow model. All the equations are discretized by the finite volume method by means of a twodimensional formulation, using the SIMPLE pressure-velocity coupling algorithm. With regard to the flow characteristics, the interpolation QUICK scheme is used, and a second-order upwind scheme is applied for the pressure terms. The results are shown in terms of streamlines, mean and axial velocity fields, dynamic pressure, turbulent kinetic energy, viscosity and temperature fields. This type of analysis is very useful in many industries and engineering related problem for getting good idea about the physical model whenever the analytic solution is out of reach.

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Experimental investigation of heat transfer and pressure drop characteristics of non-Newtonian nanofluids flowing in the shell-side of a helical baffle heat exchanger with low-finned tubes

Cited by 13 publications

References 27 publications

Advances of nanofluids in heat exchangers—A review

Advances of nanofluids in heat exchangers—A review

Thermal performance enhancement studies on a circular finned coil-in-shell heat exchanger using graphene oxide nanofluid

Hydrogen Flow over a Detached V-Shaped Rib in a Rectangular Channel

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