Mesh sensitivity of RANS simulations on film cooling flow

Jiang, Yuewen; Murray, Alexander V.; Mare, Luca di; Ireland, Peter T.

doi:10.1016/j.ijheatmasstransfer.2021.121825

Cited by 10 publications

(1 citation statement)

References 43 publications

(39 reference statements)

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“…The approximate solution may depend on the resolution adopted in the modeling [72]. While this is acceptable, the solution should not be very sensitive to small changes in resolution [73,74] as this can reflect inadequate settings.…”

Section: Resolution Sensitivity Testmentioning

confidence: 99%

Energy Generation Intensity (EGI) of Solar Updraft Tower (SUT) Power Plants Relative to CSP Plants and PV Power Plants Using the New Energy Simulator “Aladdin”

Marzouk

2024

Energies

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The current investigation provides information about solar updraft tower power plants, SUTPPs (also called solar chimney power plants, SCPPs), which form a unique method of solar-powered electricity production through a ducted wind turbine driven by induced airflow as a result of solar heating. The investigation is conducted using numerical modeling via the system-level simulation tool Aladdin (developed and released freely by the Institute for Future Intelligence, IFI) for solar energy systems, wind energy systems, or the built environment. The Aladdin energy simulator is first evaluated here by comparison with published experimental and numerical results corresponding to the historical 50 kW prototype SUTPP that was successfully tested in Manzanares (Spain) between 1982 and 1989. This prototype has a height of about 195 m for the chimney (the updraft tower) and a radius of about 122 m for the solar heat absorber (the solar air collector or the greenhouse). Next, various climate and performance characteristics are investigated and contrasted for nine different locations around the world with a similar latitude of 24°, which is within the sunbelt, assuming that the same Manzanares SUTPP prototype geometry is employed in these locations. These nine locations are Muscat (Oman), Al Jawf (Libya), Riyadh (Saudi Arabia), Karachi (Pakistan), Ahmedabad (India), Havana (Cuba), Culiacán (Mexico), Dhaka (Bangladesh), and Baise (China). The energy generation intensity (EGI) for the Manzanares-type solar updraft tower power plant in these nine examined locations was between 0.93 kWh/m2 per year (in Baise) and 2.28 kWh/m2 per year (in Muscat). Also, Muscat had the smallest seasonality index (maximum-to-minimum monthly electric output) of 1.90, while Baise had the largest seasonality index of 4.48. It was found that the main limitation of the overall SUTPP energy conversion efficiency is the chimney efficiency (the process of accelerating the air after entering the chimney). This study concludes that solar updraft towers (SUTs) cannot compete with existing mature and modular renewable energy alternatives, particularly photovoltaic (PV) panels, if the aimed use is commercial utility-scale electricity generation. Instead, SUTs may become attractive and achievable if viewed as hybrid-use projects by serving primarily as a large-scale greenhouse area for agricultural applications while secondarily allowing energy harvesting by generating clean (emissions-free) electricity from the incoming solar radiation heat.

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Section: Resolution Sensitivity Testmentioning

confidence: 99%

Energy Generation Intensity (EGI) of Solar Updraft Tower (SUT) Power Plants Relative to CSP Plants and PV Power Plants Using the New Energy Simulator “Aladdin”

Marzouk

2024

Energies

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A model and its experiment using compressed cold air to clean the active surface of a grinding wheel during sharping of a hob cutter

Stachurski

Sawicki

Krupanek

et al. 2022

Int J Adv Manuf Technol

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The removal of chips, which is produced during the grinding process and forms, among other things, cloggings on the grinding wheel active surface (GWAS), is key to extending wheel life and achieving low surface roughness. Currently, as a result of the minimum quantity lubrication (MQL) method of delivery coolant into the cutting zone, the support of chips removal with a stream of cooled compressed air (CCA) is becoming particularly important. Among other things, the angle of the CCA jet delivery nozzle with respect to the GWAS is responsible for the removal efficiency, which has to be considered individually for each grinding process variation, and experimental tests alone do not give an idea of the CCA jet flow. In the present study, a numerical flow analysis (using the computational fluid dynamics method) of cooled compressed air in the grinding zone during the sharpening of a hob cutter face was carried out. The results of the numerical simulations were verified experimentally by determining the percentage of the grinding wheel clogging Z%. The experimental results confirmed the conclusions from the numerical analysis regarding the most favorable angle of the CCA nozzle. The Z% = 5.3 clogging index obtained when grinding with the CCA nozzle set at an angle of 45° is 2.5 times lower than the Z% = 13.5 index determined for the most favorable setting of the MQL nozzle. Simultaneous delivery of CCA and air-oil aerosol using the MQL-CCA method resulted in the lowest Z% = 2.5, comparable to the Z% = 2.0 obtained for a grinding wheel operating under cooling conditions with a water-based oil emulsion delivered by the flood method (WET).

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A critical review of experimental and CFD techniques to characterize the mixing performance of anaerobic digesters for biogas production

Wang

Zhao

et al. 2022

Rev Environ Sci Biotechnol

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Mesh sensitivity of RANS simulations on film cooling flow

Cited by 10 publications

References 43 publications

Energy Generation Intensity (EGI) of Solar Updraft Tower (SUT) Power Plants Relative to CSP Plants and PV Power Plants Using the New Energy Simulator “Aladdin”

Energy Generation Intensity (EGI) of Solar Updraft Tower (SUT) Power Plants Relative to CSP Plants and PV Power Plants Using the New Energy Simulator “Aladdin”

A model and its experiment using compressed cold air to clean the active surface of a grinding wheel during sharping of a hob cutter

A critical review of experimental and CFD techniques to characterize the mixing performance of anaerobic digesters for biogas production

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