Investigation on the flow and convective heat transfer characteristics of nanofluids in the plate heat exchanger

Sun, Bin; Cheng, Po-Tai; Zuo, Ruiliang; Yang, Di; Li, Hongwei

doi:10.1016/j.expthermflusci.2016.03.005

Cited by 73 publications

(21 citation statements)

References 15 publications

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“…Nanofluids are stable colloidal suspensions of nano-size particles dispersed in water or oil [Yu et al, 2012]. A number of studies have been conducted to investigate the thermal properties of nanofluids since the presence of nanoparticles can lead to a significant enhancement of thermal conductivity [Azimi et al, 2013, Albadr et al, 2013, Minea et al, 2015, sun et al, 2016. In recent years, the study of nanofluids for potential friction reduction and anti-wear performance has also received great attention.…”

Section: Introductionmentioning

confidence: 99%

Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass

Tao¹,

Wang²,

Barber³

et al. 2019

ESJ

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In this research, friction and wear characteristics of oil-based ZnO nanofluid applied on brass disk specimens using a flat-on-flat reciprocating sliding test were studied. Oleic acid was used as surfactant to improve the stability and dispersibility of the ZnO nanofluid. Metallurgical optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy were utilized to understand the mechanisms. A 2wt% ZnO nanofluid resulted in 61.1% reduction in coefficient of friction. Good wear resistance was achieved using low concentrations of 0.5wt% and 1wt% ZnO nanofluid. A tribo-film mainly composed of carbon was found inside the wear track, which enhanced the wear resistance and lowered the interface shear strength. This tribo-film was produced by oleic acid which was chemically adsorbed to the brass materials.

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Section: Introductionmentioning

confidence: 99%

Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass

Tao¹,

Wang²,

Barber³

et al. 2019

ESJ

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“…Their results revealed that optimum volume concentrations vary for each nanoparticle. In a similar study, Sun et al [18] experimentally analyzed the various mass volume ratios of different nanoparticles including Cu, Fe 2 O 3 and Al 2 O 3 in water as base fluid with the aim of increasing heat transfer properties of PHE. Their obtained findings demonstrate that the overall heat transfer coefficient (OHTC) and also resistance coefficient were meaningfully increased.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Gürbüz

Sözen

Variyenli

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Different methods have been utilized to enhance the thermal efficiency of the heat exchangers (HEs). A widely used method to upgrade the thermal efficiency of HEs is upgrading the thermal properties of working fluid by utilizing nanoparticles. In this study, Al 2 O 3 and CuO have been utilized to prepare Al 2 O 3-CuO/water hybrid nanofluid. Accordingly, Al 2 O 3 and CuO nanoparticles have been mixed into the water with 1% (50:50) weight concentration. The main objective of this work is testing the prepared hybrid nanofluid in plate-type HEs (PHEs) with 8, 12 and 16 plates to determine the influence of number of plates on heat transfer improvement by hybrid nanofluid. Experimental findings of the present study demonstrated that utilizing Al 2 O 3-CuO/water hybrid-type nanofluid in the PHE enhanced thermal efficiency notably in comparison with singletype nanofluids. Using this hybrid nanofluid increased the thermal performance in all PHEs with different number of plates. However, it is observed that increasing number of plates led to more increment in thermal performance by utilizing hybrid nanofluid. The highest increment in overall heat transfer coefficient was obtained as 12%, 19% and 20% in PHEs with eight, 12 and 16 plates, respectively. In addition, the highest enhancement in effectiveness was achieved as 10%, 11.7% and 16% in PHEs with eight, 12 and 16 plates, respectively. Keywords Plate heat exchanger • Hybrid nanofluid • Al 2 O 3-CuO/water • Performance List of symbols A Total heat transfer area (m 2) C Heat capacity rate (W/K) c p Specific heat capacity (J/kg K) D h Hydraulic diameter (m) f Friction factor

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“…The maximum increment in the heat transfer rate using TiO 2 /deionized water and kaolin/deionized water was 12% and 18%, respectively. Sun et al 27 used copper, iron oxide, and aluminum oxide (Cu, Fe 2 O 3 , and Al 2 O 3 ) fluids in a plate heat exchanger and found that there was an increase in the overall heat transfer coefficient and resistance coefficient, compared with deionized water, and the overall heat transfer coefficient was improved significantly with the increase in the mass fraction of nanoparticles. Kasaeian et al 28 reported that for high‐performance cooling of solar collectors, PV systems, and solar thermoelectric systems, nanofluids are the best option.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of photovoltaic panels using two types of nanofluids

2020

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One of the main problems that limit the extensive use of photovoltaic (PV) systems is the increase in the temperature of PV panels. Overheating of a PV module decreases the performance of the output power by 0.4% to 0.5% per 1°C over its rated temperature that in most cases is 25°C. An effective way of improving electrical performance (power output and efficiency) and reducing the rate of thermal degradation of a PV module is to reduce the operating temperature of the PV surface by a cooling medium. To achieve this, nanofluids can be considered as a potentially effective solution for cooling. In this study, two types of nanofluids, namely Al2O3 and TiO2 water‐based mixture of different volume flow rates and concentrations (0.01%, 0.05%, and 0.1%) by weight, were used. Also, three PV panels were cooled simultaneously using nanofluids, water, and natural air, respectively. Results showed that nanofluids for cooling enhanced heat transfer rate much better than water and natural air. Best results were achieved for TiO2 nanofluids at the considered concentration (0.1 wt%). Nanofluid cooling of turbulent flows for such an application has not been investigated before. These results represent the first application of nanofluid cooling in the turbulent flow regimes and in outdoor conditions including real solar irradiation.

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Investigation on the flow and convective heat transfer characteristics of nanofluids in the plate heat exchanger

Cited by 73 publications

References 15 publications

Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass

Tribological Mechanism of Friction and Wear Reduction Using Oil-Based ZnO Nanofluid Applied on Brass

A comparative study on utilizing hybrid-type nanofluid in plate heat exchangers with different number of plates

Performance enhancement of photovoltaic panels using two types of nanofluids

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