Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers

Sözen, Adnan; Variyenli, Halil İbrahim; Özdemir, Mustafa; Gürü, Metin; Aytaç, İpek

doi:10.1016/j.joei.2015.02.012

Cited by 44 publications

(19 citation statements)

References 16 publications

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“…Sozen et al [69] studied the role of fly ash water-based nanofluid in increasing the efficiency of a concentric tube heat exchanger. They prepared 2 wt.% nanofluid through direct synthesis.…”

Section: Thermal Applications Of Hybrid Nanofluidsmentioning

confidence: 99%

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

Hussien¹,

Al‐Kouz²,

Yusop³

et al. 2019

SV-JME

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Section: Thermal Applications Of Hybrid Nanofluidsmentioning

confidence: 99%

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

Hussien¹,

Al‐Kouz²,

Yusop³

et al. 2019

SV-JME

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“…Enhancing the thermophysical properties of the working fluid can increase the heat transfer rate in the heat exchangers. 10–12 In this way, nanoparticles could be added to the base fluid with the aim of improving the heat transfer rate. Similarly, nanoparticles can be used to enhance the combustion performance of a fuel.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer enhancement of plate heat exchanger utilizing kaolin-including working fluid

Sözen

Khanları

Çiftçi

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Plate heat exchangers having high efficiency and small size are one of the mostly used heat exchangers. They are used in many applications ranging from cooling to heating. Heat transfer improvement of plate heat exchangers can be performed using nanoparticle-including working fluids, i.e. nanofluids. Influences of kaolin-including nanofluid utilization as working fluid on heat transfer performance of the plate heat exchanger were experimentally investigated in this study. The prepared nanofluid included 2% (wt/wt) nanoparticle content and Triton X-100 surfactant was added to the prepared mixture at the rate of 0.2% of a final concentration to increase the solubility of nanoparticles. The experiments were performed in various working conditions with changes in mass flow rate and temperature. The obtained results showed that nanofluid usage as the working fluid enhanced the heat transfer rate in plate heat exchanger in comparison to the results acquired from the tests conducted by deionized water. The improvement rate in mean heat transfer coefficient was achieved as 9.3% when kaolin–deionized water nanofluid was used as the working fluid in plate heat exchanger.

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“…Sozen et al [20] studied enhancing the thermal performance of parallel and cross-flow concentric tube heat exchangers using fly ash nanofluid. In another study Sozen et al [21] investigated comparison of improving heat transfer by using Al 2 O 3 and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers. They showed that efficiencies of the parallel flow concentric tube heat exchanger and the cross-flow concentric tube heat exchanger can be improved by 31.2% and 6.9%, respectively, when using fly ash nanofluid.…”

Section: Introductionmentioning

confidence: 99%

The heat transfer enhancement of concurrent flow and counter current flow concentric tube heat exchangers by using hexagonal boron nitride/water nanofluid

2019

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Heat exchangers are used in many applications including chemical, oil, and gas power generation, refrigeration, pharmaceuticals, and food processing. Because of their widespread usage, they have various types to serve at different working conditions. Increasing the performance of heat exchangers has become a very interesting field of study since the efficiency of various industrial and domestic systems depend on them. In this study, a coaxial double tube experimental set-up was prepared, and the effect of using nanohexagonal boron nitride nanofluid as hot working fluid on the heat transfer performance increase was investigated. The experiments were carried out in concurrent flow and counter flow conditions for various hot fluid-flow rates to obtain the heat transfer coefficients. Nanohexagonal boron nitride obtained in powder form was used to prepare the nanofluid by a two-step method. The 4 kg nanofluid containing 2% nanohexagonal boron nitride with 0.5% Triton X-100 as a surfactant in terms of mass ratio was prepared for the experiments. Heat transfer experiments were carried out three times by using the prepared nanohexagonal boron nitride/water nanofluid and pure water as hot fluid to reach more precise results. In the result of this study, the total heat transfer coefficient showed an average improvement of 48.78% for the concurrent flow heat exchanger, while an average improvement of 0.36% was observed in the counter flow conditions compared to the base fluid. This study shows the potential of application of nanohexagonal boron nitride/water nanofluid in heat management applications.

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Heat transfer enhancement using alumina and fly ash nanofluids in parallel and cross-flow concentric tube heat exchangers

Cited by 44 publications

References 16 publications

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

A Brief Survey of Preparation and Heat Transfer Enhancement of Hybrid Nanofluids

Heat transfer enhancement of plate heat exchanger utilizing kaolin-including working fluid

The heat transfer enhancement of concurrent flow and counter current flow concentric tube heat exchangers by using hexagonal boron nitride/water nanofluid

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