Secondary Currents at Very Low and High Aspect Ratios of Open Channels

Shinneeb, Monsif; Nasif, G.; Balachandar, Ram

doi:10.37934/cfdl.14.5.115

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…More details for l IDDES methodology is provided in Saini et al (2018). The IDDES model has been proven to reproduce the experimental data with reasonable accuracy concerning our previous study for wake flows (Nasif et al, 2022b;Shinneeb et al, 2022).…”

Section: Computational Methodologymentioning

confidence: 79%

Cooling enhancement for engine parts using jet impingement

Nasif,

Shinneeb,

Balachandar

2024

Front. Mech. Eng.

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A computational study has been performed to evaluate the use of jet impingement for cooling applications in the automotive industry. The current study uses an entire internal combustion engine cylinder with its components as a computational domain. An unsteady numerical solution for the Navier-Stokes equations was carried out using Improved Delayed Detached Eddy Simulation (IDDES). The volume of fluid approach is proposed to track and locate the liquid jet surface that is in contact with the air. The conjugate heat transfer approach is used to link the heat transfer solution between the fluid and the solid. The boundary conditions that are employed in the study are provided from lab experiments and one-dimensional simulations. The cooling jet in this study targets the hottest region in the piston, i.e., the region underneath the exhaust valve. Three nozzle sizes with flows at different Reynolds numbers are chosen to examine the thermal characteristics of the cooling jet. The computational study reveals that for a specific Reynolds number, the smaller diameter nozzle provides the highest heat transfer coefficient around the impingement point. The maximum relative velocity location at the impingement point slightly leads the location of the maximum Nusselt number. The maximum temperature in the piston decreases by 7% to 11% as the nozzle diameter changes from 1.0 to 3.0 mm for a jet Reynolds number of 4,500. If a correct selection is made for the nozzle size, the cooling jet can be efficiently used to reduce the temperature and alleviate the thermal stresses in the piston in the region underneath the exhaust valve where the maximum temperature occurs.

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Section: Computational Methodologymentioning

confidence: 79%

Cooling enhancement for engine parts using jet impingement

Nasif,

Shinneeb,

Balachandar

2024

Front. Mech. Eng.

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“…This is because the counter-current motion creates regions of slower flow, resulting in a reduced Froude number. Near the bed channel, the velocity is high, while it is relatively lower on the surface [20].…”

Section: Velocity Distribution On Downstream Channelmentioning

confidence: 95%

Flow Visualization on Submerged Flow Conditions in Open Channel Weir Downstream

Siti Natasha Malik Fesal,

Mas Fawzi,

Mohd Azahari Razali

et al. 2023

ARFMTS

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Submerged flow regimes are common phenomena observed in open channel flow, such as rivers and spillways, with or without weirs. These flow regimes involve a sudden rise in the liquid surface downstream when high-velocity liquid discharges into a region of lower velocity. The rapid deceleration of the flowing liquid results in an increase in height and a conversion of kinetic energy into potential energy, with some energy dissipated as turbulence and heat. In this study, flow visualization techniques were employed to investigate the two-dimensional hydrodynamic characteristics of submerged hydraulic jumps within the Froude number range of 1.0 to 5.4 over a fixed bed. The obtained results were compared with existing literature data, showing a good agreement. This research contributes to the understanding of submerged flow phenomena and provides valuable insights into the hydrodynamics of submerged hydraulic jumps.

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Secondary Currents at Very Low and High Aspect Ratios of Open Channels

Cited by 2 publications

References 15 publications

Cooling enhancement for engine parts using jet impingement

Cooling enhancement for engine parts using jet impingement

Flow Visualization on Submerged Flow Conditions in Open Channel Weir Downstream

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