Heat Transfer Enhancement with Al2O3 Nanofluids and Twisted Tapes in a Pipe for Solar Thermal Applications

Sekhar, Y. Raja; Sharma, K.V.; Karupparaj, R. Thundil; Chiranjeevi, C.

doi:10.1016/j.proeng.2013.09.229

Cited by 64 publications

(18 citation statements)

References 23 publications

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“…Choi et al showed that non-metallic nanomaterials, multiwall carbon nanotubes (CNTs), in water increased the thermal conductivity up to 160% at 1% volume fraction. After that, much research on heat-transfer fluids was performed with different nanoparticles, such as aluminum [ 13 , 14 , 15 ], gold [ 16 ], copper oxide [ 17 ], CNT [ 18 , 19 ], silicon dioxide, titanium dioxide [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Experimental Study on the Rheological Properties and Thermal Conductivity of Halloysite Nanofluids

Alkurdi

Lukács

et al. 2020

Nanomaterials

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Nanofluids obtained from halloysite and de-ionized water (DI) were prepared by using surfactants and changing pH for heat-transfer applications. The halloysite nanotubes (HNTs) nanofluids were studied for several volume fractions (0.5, 1.0, and 1.5 vol%) and temperatures (20, 30, 40, 50, and 60 °C). The properties of HNTs were studied with a scanning electron microscope (SEM), energy-dispersive X-ray analysis (EDX), Fourier-transform infrared (FT-IR) spectroscopy, X-ray powder diffraction (XRD), Raman spectroscopy and thermogravimetry/differential thermal analysis (TG/DTA). The stability of the nanofluids was proven by zeta potentials measurements and visual observation. With surfactants, the HNT nanofluids had the highest thermal conductivity increment of 18.30% for 1.5 vol% concentration in comparison with the base fluid. The thermal conductivity enhancement of nanofluids containing surfactant was slightly higher than nanofluids with pH = 12. The prepared nanofluids were Newtonian. The viscosity enhancements of the nanofluid were 11% and 12.8% at 30 °C for 0.5% volume concentration with surfactants and at pH = 12, respectively. Empirical correlations of viscosity and thermal conductivity for these nanofluids were proposed for practical applications.

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Section: Introductionmentioning

confidence: 99%

A Novel Experimental Study on the Rheological Properties and Thermal Conductivity of Halloysite Nanofluids

Alkurdi

Lukács

et al. 2020

Nanomaterials

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“…Researchers have carried out various experimental studies on heat transfer augmentation by using twisted tape inserts. Raja Sekhar et al 78 proved that using twisted tapes and nanofluids in the tube, heat transfer enhancement in a horizontal tube increased with Reynolds number and nanoparticle volume fraction. Ponnada et al 79 conducted an experimental study to investigate the effect of perforated twisted tape with alternate axis (PATT), PTTs and regular twisted tapes (TTs) with TR of 3, 4 and 5 on the heat transfer rate of the system.…”

Section: Experimental Study Of Twisted Tape With Nanofluidmentioning

confidence: 99%

“…Raja Sekhar et al. 78 proved that using twisted tapes and nanofluids in the tube, heat transfer enhancement in a horizontal tube increased with Reynolds number and nanoparticle volume fraction. Ponnada et al.…”

Section: Experimental Study Of Twisted Tape With Nanofluidmentioning

confidence: 99%

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Ahmad

Abdullah

Sopian

2014

Advances in Mechanical Engineering

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Working fluid with higher thermal conductivity and tube with better fluid mixing are two crucial elements for heat transfer enhancement in heat exchanger system. Hence, several methods and techniques have been explored to improve heat transfer efficiency, including dispersing nanoparticles into conventional heat transfer fluid and inserting instruments inside the tube of the heat exchanger. Studies have shown that nanofluid can improve heat transfer efficiency of the system due to its higher thermal conductivity and drastic Brownian motion of nanoparticles while inserts within tube can improve heat transfer efficiency by increasing axial velocity of working fluid for better fluid mixing. This article summarized 109 of journals from recent research on heat transfer enhancement of nanofluid flowing inside the tube with inserts as well as discussing the significant parameters that affected the system’s efficiency such as nanoparticles’ volume fraction, Reynolds number and types and configurations of inserts. Ultimately, analysis will be carried out to determine the most suitable modification of twisted tape inserts with the most optimum value of nanoparticle volume fraction for turbulence flow regime. Finally, some problems that need to be solved for future research such as agglomeration and pressure drop are discussed.

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“…Jaisankar [4] reported experimentally on heat transfer and friction factor characteristics of forced circulation solar water heater system fitted with helical twisted tapes and also developed correlations for Nusselt number and friction factor with various twist ratios. Raja Sekhar et al [5] worked with Al2O3 nano-fluids and twisted tapes in a pipe for solar thermal heater. Saha and co-workers [6][7][8][9][10] have studied experimentally laminar flow through square and rectangular ducts having twisted tapes types vortex generator with oblique teeth, axial corrugations, transverse ribs and wire coil inserts.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Heat Transfer Enhancement by Swirl Generators in a Solar Air Heater Duct

Bhattacharyya¹,

Chattopadhyay²,

Bandyopadhyay³

et al. 2016

IJHT

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Experimental investigations on heat transfer enhancement by swirl generators are presented. The thermo hydraulic performance has been evaluated. The experiments were conducted over a wide range of Reynolds number from 993 to 12,034 by employing air (Pr = 0.7) as the working fluid. The major findings of this experimental investigation are that the circular grooved tube with different diameter ratio (h = d/D = 0.04 and 0.06) and pitch ratio (y = p/D = 1.5 and 3.0) perform better than the smooth duct. In evaluation of thermal performance, it is seen that the bluff cylinder of (y = 1.5, h =0.06) are thermodynamically advantageous than the other roughness used. The result is useful for heat exchanger, solar air-heater, etc.

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Heat Transfer Enhancement with Al2O3 Nanofluids and Twisted Tapes in a Pipe for Solar Thermal Applications

Cited by 64 publications

References 23 publications

A Novel Experimental Study on the Rheological Properties and Thermal Conductivity of Halloysite Nanofluids

A Novel Experimental Study on the Rheological Properties and Thermal Conductivity of Halloysite Nanofluids

A review on the thermal performance of nanofluid inside circular tube with twisted tape inserts

Experimental Investigation on Heat Transfer Enhancement by Swirl Generators in a Solar Air Heater Duct

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