An experimental investigation on pool boiling heat transfer enhancement using sol-gel derived nano-CuO porous coating

Joseph, Albin; Mohan, Sreejith; Kumar, C.S. Sujith; Mathew, Arun; Thomas, Shijo; Vishnu, B.R.; Sivapirakasam, S.P.

doi:10.1016/j.expthermflusci.2018.12.033

Cited by 40 publications

(6 citation statements)

References 30 publications

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“…Design of experiments is a collection of tools used mainly to interpret the influence of process parameters on output response [41]. Among the various tools in DoE, response surface methodology was employed [21] in the present study to analyse the influence of variation in were generated using the Design Expert software, as shown in Table 1.…”

Section: Preparation Of Sio2/ag-cuo Nanofluidmentioning

confidence: 99%

Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Joseph

Sreekumar

Kumar

et al. 2019

Journal of Molecular Liquids

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Augmenting thermal and optical properties of working fluids used in solar thermal conversion systems using hybrid nanomaterials is gaining prominence. In the present study photo-thermal analysis and thermal conductivity investigations were performed on SiO2/Ag-CuO binary water based nanofluid. The influence of particle concentration and surfactant concentration on thermo-optical properties were investigated using the design of experiment concept. Analysis of variance (ANOVA) was employed to study the significance of the process parameters on thermal conductivity and solar weighted absorption fraction of nanofluid. The statistical optimisation of the process parameters was done using the desirability function. The optimum combination of nanoparticles and surfactant that yield good thermal conductivity and solar absorption was found to be SiO2/Ag: 206.3 mg/litre, CuO: 864.7 mg/litre, and SDS (surfactant): 1996.2 mg/litre. The optimum mass fraction of constituents yielded a relative thermal conductivity of 1.234 and solar weighted absorption fraction of 82.82 %.

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Section: Preparation Of Sio2/ag-cuo Nanofluidmentioning

confidence: 99%

Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Joseph

Sreekumar

Kumar

et al. 2019

Journal of Molecular Liquids

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“…High porosity and roughness and low wettability were the causes for such enhancement in HTC. 27 The critical heat flux investigation results revealed that the capillary wicking momentum was due to high wettability and altered surface roughness which were significant factors for the enhancement of CHF at minimum wall superheat. [28][29][30][31][32] The CHF augmentation of 61% and HTC of 198% have been achieved on microporous copper surfaces due to larger nucleation site density, increased bubble departure frequency, and reduced bubble diameter during departure.…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Influence of TiO₂ thin film on critical heat flux and performance enhancement of pool boiling at atmospheric pressure

Nithyanandam¹,

Duraisamy²,

Devarajan³

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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An increase in the rate of heat generation due to the compactness and performance enhancement of electronics equipment has been observed in the recent years. Though the efficient heat recovery to improve safety and to increase the life span of the equipment is a challenging task, Pool boiling is considered as a technique to recover an abundant quantity of heat at minimum wall superheat. The performance and safety factors are explored using boiling heat transfer coefficient and critical heat flux. The present investigation is carried out on a plain copper surface and copper surface coated with TiO2 thin film with three different thicknesses, namely 250, 500 and 750 nm. This work also explores the influence of wettability and roughness of the TiO2 thin film coated surfaces. The morphological and structural studies are conducted by scanning electron microscopy and x-ray diffraction scanning electron microscopic patterns. The critical heat flux of TiO2 thin film coated surface at 750 nm thicknesses was better augmented by 69% than the plain copper surface. The heat transfer coefficient was better augmented by 117% than the uncoated copper surface. The excellence in hydrophillic nature of the TiO2 thin film creates numerous nucleation sites which in turn enhance the capillary wicking. The continuous wetting and rewetting characteristics of the TiO2 thin film enhance the critical heat flux and boiling heat transfer coefficient.

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“…Design of experiments (DoE), fuzzy logic and artificial neural network (ANN) are the most preferred tools for finding the interaction of input parameters on the output response. Out of these, DoE will provide an insight into the dependence of response on input parameters in a minimum number of experiments [17]. Esfe et al [18] optimized the rheological and thermal properties of Al2O3-EG/water nanofluid by using response surface methodology (RSM).…”

Section: Introductionmentioning

confidence: 99%

“…For obtaining the optimum composition that yields maximum optical absorption, response surface methodology (RSM) in Design Expert 10 was employed. RSM provides a clear insight of input variables interaction on output response using a minimum number of experimental runs[17]. The parameters considered for optimization are the concentrations of nanoparticle and surfactant.…”

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confidence: 99%

Investigation on influence of antimony tin oxide/silver nanofluid on direct absorption parabolic solar collector

Sreekumar

Joseph

Kumar

et al. 2020

Journal of Cleaner Production

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This paper discusses the synthesis and characterization of a novel hybrid nanofluid and its performance analysis on a parabolic trough direct absorption solar collector. Broadening the absorption spectra of working fluid using nanoparticles is the new research revolution for increasing the volumetric solar absorption efficiency. It is reported that plasmonic silver nanoparticles have higher absorption in visible spectra while antimony doped tin oxide has an absorption peak in the near-infrared region. Hence, antimony tin oxide/silver hybrid nanoparticle with broad spectral absorptivity was synthesized. Optimization of the nanofluid composition performed using response surface methodology yielded an optimized mass fraction of antimony tin oxide and surfactant, sodium dodecyl sulfate, as 0.1% each. The solar weighted absorption fraction of optimized nanofluid was obtained as 90.12%. Performance evaluation of the solar collector was based on ASHRAE standards 93-2010. The optical efficiency of the parabolic collector was calculated to be 75%. The maximum thermal efficiency obtained by the optimized nanofluid applied parabolic trough direct absorption solar collector was 63.5% at a flow rate of 0.022 kgs-1 and the highest exergy efficiency obtained was 5.6%. Thermal and exergy efficiency was observed to increase with increase in flow rate.

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An experimental investigation on pool boiling heat transfer enhancement using sol-gel derived nano-CuO porous coating

Cited by 40 publications

References 30 publications

Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Influence of TiO₂ thin film on critical heat flux and performance enhancement of pool boiling at atmospheric pressure

Investigation on influence of antimony tin oxide/silver nanofluid on direct absorption parabolic solar collector

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An experimental investigation on pool boiling heat transfer enhancement using sol-gel derived nano-CuO porous coating

Cited by 40 publications

References 30 publications

Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Optimisation of thermo-optical properties of SiO2/Ag–CuO nanofluid for direct absorption solar collectors

Influence of TiO2 thin film on critical heat flux and performance enhancement of pool boiling at atmospheric pressure

Investigation on influence of antimony tin oxide/silver nanofluid on direct absorption parabolic solar collector

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Influence of TiO₂ thin film on critical heat flux and performance enhancement of pool boiling at atmospheric pressure