Numerical study on free-surface jet impingement cooling with nanoencapsulated phase-change material slurry and nanofluid

Rehman, M. Mohib Ur; Qu, Zhiguo; Fu, R.P.; Xu, Hongtao

doi:10.1016/j.ijheatmasstransfer.2017.01.094

Cited by 50 publications

(12 citation statements)

References 38 publications

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“…Air is considered as the primary phase while injected NEPCM slurry is assumed to be the secondary phase. The multi-phase volume of fluid (VOF) model [28] is adopted to track and locate the free surface. In this model, there is no penetration between phases, and all phases are in the control volume simultaneously.…”

Section: Governing Equationsmentioning

confidence: 99%

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Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Mohammadpour

Salehi

Lee

2022

Thermo

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Attention to photovoltaic (PV) cells to convert solar irradiation into electricity is significantly growing for domestic usage and large-scale projects such as solar farms. However, PV efficiency decreases on hot days. This paper proposes an effective cooling technique consisting of a 2% nano encapsulated phase change material (NEPCM) slurry and impinging jets (IJs) in a PV system. The impact of five influencing parameters on PV efficiency is studied using a multi-phase volume of fluid (VOF) model encompassing the effects of solar irradiation, latent heat, mass flow rate, number of nozzles, and jet-to-surface distance. The maximum efficiency of 15.82% is achieved under irradiation of 600 W/m2. The latent heat shows a slight improvement at the low particle concentration. Increasing the mass flow rate to 0.12 kg/s enhances the PV output power by 17.32%. While the PV performance is shown to be improved over the increment of the number of nozzles, the jet-to-surface spacing of 5.1 mm records a remarkable PV surface temperature reduction to 33.8 °C, which is the ideal operating temperature for the PV panel.

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Section: Governing Equationsmentioning

confidence: 99%

“…In this model, there is no penetration between phases, and all phases are in the control volume simultaneously. The VOF model, continuity, momentum, energy conservation equations, the volume fraction equation, and the turbulence model are expressed as follows [28].…”

Section: Governing Equationsmentioning

confidence: 99%

Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Mohammadpour

Salehi

Lee

2022

Thermo

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“…Structurally the nanoencapsulated PCM slurries are more stable than that of micron counterpart. Moreover in the nanoencapsulated PCM slurries, the resistance to heat transfer can be reduced by the unsuccessful close contact between the nanoparticles and heat transfer fluid [112]. In microchannel heat sinks, the use of nanoencapsulated PCM slurries not only enhances the thermal capacity but also enhances thermal conductivity.…”

Section: Pcm Slurriesmentioning

confidence: 99%

Recent advances in phase change materials for thermal energy storage-a review

Venkateswarlu¹,

Konijeti

2021

J Braz. Soc. Mech. Sci. Eng.

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The research on phase change materials (PCMs) for thermal energy storage systems has been gaining momentum in a quest to identify better materials with low-cost, ease of availability, improved thermal and chemical stabilities and eco-friendly nature. The present article comprehensively reviews the novel PCMs and their synthesis and characterization techniques for improving the properties and long-term storage capabilities. They include eco-friendly PCMs based on wood and tree fruit oils, microPCMs, nanoconfinement of organic PCMs, metal organic PCMs, bio-based PCMs, metal organic framework (MOF) PCMs and form-stable PCMs with gelators. The novel approaches such as cryogenically treated microencapsulated PCMs and treating them with photo-switching dopants to improve the properties are also presented. This review provides the useful insights about recent advances in the field of PCMs. The phase change slurries can effectively improve the thermal performance of photovoltaic/thermal systems. The thermal conductivity of PCMs can be enhanced significantly by PCM slurries, MOFs, exfoliated graphite nanoplatelets and composite PCMs. Optical control of PCMs by doping them with azobenzene dopants is found to be the most promising technique to improve the thermal stability and long-term storage capacity of PCMs. Cyclic cryogenic treatment by liquid nitrogen followed by heat treatment of PCMs can improve the latent heat, thermal and chemical stabilities significantly. The insightful information presented in this article can serve as an important tool for the researchers in the field of PCMs research to further innovate the technology in different applications such as thermal management of buildings, solar energy storage and cryogenic storage etc.

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“…The system's pressure drop increased drastically by slurry in comparison to water alone due to higher viscosity. In another work, Rehman et al [163] performed a numerical study using free surface jet impingement with NEPCM slurry and a nanofluid. The nanofluid was used as a coolant along with NEPCMs and water.…”

Section: Nanofluidsmentioning

confidence: 99%

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

et al. 2021

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Jet impingement is considered to be an effective technique to enhance the heat transfer rate, and it finds many applications in the scientific and industrial horizons. The objective of this paper is to summarize heat transfer enhancement through different jet impingement methods and provide a platform for identifying the scope for future work. This study reviews various experimental and numerical studies of jet impingement methods for thermal-hydraulic improvement of heat transfer surfaces. The jet impingement methods considered in the present work include shapes of the target surface, the jet/nozzle–target surface distance, extended jet holes, nanofluids, and the use of phase change materials (PCMs). The present work also includes both single-jet and multiple-jet impingement studies for different industrial applications.

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Numerical study on free-surface jet impingement cooling with nanoencapsulated phase-change material slurry and nanofluid

Cited by 50 publications

References 38 publications

Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Recent advances in phase change materials for thermal energy storage-a review

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

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