Experimental and numerical investigations of turbulent forced convection flow of nano-fluid in helical coiled tubes at constant surface temperature

Rakhsha, Milad; Akbaridoust, Farzan; Abbassi, Abbas; Majid, Saffar Avval

doi:10.1016/j.powtec.2015.05.019

Cited by 57 publications

(16 citation statements)

References 20 publications

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“…The obtained deviation lies within ± 0.24% to ± 1.53% with standard deviation. Experimental Nu and friction factor results of fully developed laminar to turbulent flow region in CSHE were confirmed by comparing with existing correlations respectively by Seban and McLaughlin [26], Boonsri et al [15] and Beigdzadeh et al [27], Milad et al [11] as illustrated in Fig. 4b and c.…”

Section: Data Reductionsupporting

confidence: 78%

“…The physical properties of GO nanofluid are presented in Table 1. The thermophysical properties of GO nanofluid are found at various temperatures for various volume concentrations (0.05%, to 0.15%) based on correlations available in the literature [11,23] The density of nanofluid in kg/m 3 ;…”

Section: Preparation Of Nanofluid and Its Propertiesmentioning

confidence: 99%

“…The deviation of experimental Nu with existing correlation could be attributed to the coil material, experimental uncertainty, different trial conditions, range of parameters, and intrinsic losses in the test set rig, etc. [15,26], c friction factor v/s Re for validation [11,27] Figure 5 illustrates the variation of average Nu (Nu a ) with Re at different HAVs (1-5 m/s) and volume concentrations of GO/water nanofluid (0.05-0.15%) for plain CSHE. The average Nu increased with HAV for all volume concentrations of nanofluid both in laminar and turbulent flow regimes.…”

Section: Repeatability and Validationmentioning

confidence: 99%

“…They found that Nu was increasing as volume concentration of Al 2 O 3 nanofluid increased and observed a higher value of Nu, compared to base fluid with minimum pumping power. Steady-state turbulent forced convection flow of CuO nanofluid inside helically coiled tubes at constant wall surface temperature was investigated through analytical and experimental techniques by Rakhsha et al [11]. The analytical results revealed 6-7% and 9-10% improvement in heat transfer and pressure loss, respectively.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Data Reductionsupporting

confidence: 78%

Section: Preparation Of Nanofluid and Its Propertiesmentioning

confidence: 99%

Section: Repeatability and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…Authors mentioned that the centrifugal forces increase the heat transfer. Rakhsha et al (2015) investigated experimentally and numerically the turbulent forced convection flow of CuO-water nanofluid. Results indicate that the maximum velocity and Nu number is located near of the outer wall due to the existence of centrifugal force.…”

Section: Introductionmentioning

confidence: 99%

Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube

Elashmawy

Kolsi

2016

Int. j. adv. appl. sci.

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A three-dimensional turbulent forced convective heat transfer and flow characteristic, in a helical triangular cross sectioned coiled tube is simulated using the k-ɛ standard turbulence model and compared to results corresponding to circular cross sectioned helical tube. A finite element method is employed to solve the governing equations. The effects of Reynolds number, on Nusselt number, velocity and temperature profiles are discussed. The numerical computations show the developments and distributions of heat transfer and flow fields in the tube. These profiles are altered by the effect of curvature inducing the centrifugal forces.

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A Review on the Application of Nanofluids in Coiled Tube Heat Exchangers

Fsadni¹,

Whitty²,

Adeniyi³

et al. 2017

Micro and Nanomanufacturing Volume II

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Experimental and numerical investigations of turbulent forced convection flow of nano-fluid in helical coiled tubes at constant surface temperature

Cited by 57 publications

References 20 publications

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

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

Turbulent forced convection heat transfer in triangular cross sectioned helically coiled tube

A Review on the Application of Nanofluids in Coiled Tube Heat Exchangers

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