Heat transfer and hydrodynamics of air assisted free water jet impingement at low nozzle-to-surface distances

Glaspell, Aspen W.; Rouse, Victoria J.; Friedrich, Brian K.; Choo, Kyosung

doi:10.1016/j.ijheatmasstransfer.2018.11.173

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…Jet-to-surface spacing is highly significant in jet impingement heat transfer [2]. Decreasing the jet-to-surface distance can move larger turbulent vortices downstream, resulting in increasing the hydraulic jump diameters and decreasing the thickness of boundary layers [35]. Figure 6 indicates the influence of the jet-to-surface spacing on the PV temperature and efficiency.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 99%

“…resulting in increasing the hydraulic jump diameters and decreasing the thickness of boundary layers [35]. Figure 6 indicates the influence of the jet-to-surface spacing on the PV temperature and efficiency.…”

Section: Resultsmentioning

confidence: 99%

Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Mohammadpour

Salehi

Lee

2022

Thermo

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“…Here the jet has the highest stagnation pressure and velocity due to the exit area decrease which occurs the jet flow deflection. The higher pressure at low nozzle-to-plate spacing in Region I generates higher heat transfer performance [5,[9][10][11][12].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 1 shows a schematic diagram of the test section [9][10][11][12]. The water flow is regulated by a flowmeter valve (Dwyer® RMB-84-SSV).…”

Section: Methodsmentioning

confidence: 99%

Heat Transfer Characteristics of Submerged and Free Surface Air-assistant Water Jet Impingement

Choo¹

2021

GJES

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Heat transfer and fluid flow characteristics of air-assistant submerged and free surface water impinging jets are experimentally investigated. Results showed that the Nusselt number and pressure decrease exponentially in both free surface and submerged jets for all volumetric qualities in jet deflection region. In transition region, the Nusselt number and pressure of the submerged jet and free surface jet decrease since the jet deflection effect was disappeared. In buoyance effect region, the Nusselt number and pressure increase in the free surface jet since the potential energy increases, while the Nusselt number and pressure decrease in the submerged jet since the bubbles are not impinged the plate due to the buoyancy effect.

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Effects of nano-dust particles on heat transfer from multiple jets impinging on a flat plate

Hadipour

Zargarabadi

Rashidi

2022

J Therm Anal Calorim

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Heat transfer and hydrodynamics of air assisted free water jet impingement at low nozzle-to-surface distances

Cited by 11 publications

References 14 publications

Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Effective Cooling System for Solar Photovoltaic Cells Using NEPCM Impingement Jets

Heat Transfer Characteristics of Submerged and Free Surface Air-assistant Water Jet Impingement

Effects of nano-dust particles on heat transfer from multiple jets impinging on a flat plate

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