Flow Field and Heat Transfer Investigation of a Confined Laminar Slot Air Jet on a Solid Block

Muthukannan, M.; Rajeshkanna, P.; Jeyakumar, S.; Bajpai, Ankit

doi:10.18869/acadpub.jafm.68.235.24326

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…Moreover, Trinh et al (2016) found that the circular orifice on the hemisphere causes a higher heat transfer rate than the simple circular one, and Buchlin (2011) discovered that the three lobes' nozzle prevails thermally over the four lobes' nozzle, which yields a similar performance to the round nozzle. Muthukannan et al (2016) investigated numerically a single vertical slot jet on a heated block mounted on the bottom wall. It is observed that the presence of a solid block increases the overall unsteadiness in the flow.…”

Section: Introductionmentioning

confidence: 99%

Shielding Gas Coaxial Jet Pipes Numerical Study of a Vertical Laser Welding Process of AZ91 Magnesium Alloy

Boughanmi¹,

Bannour²,

Mhiri³

et al. 2018

JAFM

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The laser welding of magnesium alloys, largely used in many fabrication applications, has gained considerable interest especially in aerospace, electronics, automotive industry etc. Unfortunately, this process is associated to an undesired phenomenon which is "oxidation". For this reason, a good shielding system of the welding zone is of major importance. This paper presents a numerical study using computational fluid dynamics (CFD) of a laser welding process employing a moving volumetric heat source. Starting with the turbulence model validity, a parametric study of this welding process in a vertical position aiming to optimize the design of protection gas device, the gas jet inclination, the appropriate welding direction and the gas type is, then, proposed. The optimum parametric combination ensuring the largest gas coverage area is the one where the shielding gas is Argon, supplied by the coaxial nozzles at a downward inclination angle with respect to the laser beam axis, and a downward welding direction.

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Section: Introductionmentioning

confidence: 99%

Shielding Gas Coaxial Jet Pipes Numerical Study of a Vertical Laser Welding Process of AZ91 Magnesium Alloy

Boughanmi¹,

Bannour²,

Mhiri³

et al. 2018

JAFM

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“…Various researchers have used ribbed surface in order to introduce flow unsteadiness and to enhance heat transfer rate (Muthukannan et al, 2016;Katti and Prabhu, 2008;and Shukla and Dewan, 2016). For an impinging jet over a ribbed surface, the presence of ribs interrupts the wall jet and hence the turbulence level due to local roughness.…”

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer Enhancement using Slot Jet Impingement on a Detached Rib Surface

Shukla

Dewan

2017

JAFM

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This paper presents results of a computational study to investigate the suitability of various RANS based turbulence models for slot jet impingement over flat and detached ribbed surfaces. The computed results are compared with the reported experimental data. It is observed that some turbulence models predict the experimental data with good trends, e.g., secondary peak in Nusselt number and distribution of normalized streamwise velocity. The standard k-ω and SST k-ω models predict heat transfer more accurately compared to that by other models with prediction of a secondary peak in Nusselt number. Distributions of turbulent kinetic energy, streamwise velocity and normal velocity are also analyzed to understand heat transfer behavior with flat and detached rib surfaces. Various parameters are considered to obtain a good understanding of heat transfer enhancement with jet impingement on a surface fitted with detached ribs. Further the effects of rib to plate clearance, position of first rib and Reynolds number on heat transfer characteristics are also investigated. It was observed that flow and heat transfer features are significantly affected by the placement of ribs on the impingement surface. Increasing the rib clearance, position of first rib in the streamwise direction and Reynolds number have favorable effects on heat transfer. The detached rib configuration offered augmentation in Nusselt number compared to the attached rib arrangement (i.e., with no clearance between the rib and impingement surface). Comparisons of stagnation point and average Nusselt numbers are also presented to understand heat transfer enhancement for flat and ribbed surfaces.

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Flow Field and Heat Transfer Investigation of a Confined Laminar Slot Air Jet on a Solid Block

Cited by 2 publications

References 8 publications

Shielding Gas Coaxial Jet Pipes Numerical Study of a Vertical Laser Welding Process of AZ91 Magnesium Alloy

Shielding Gas Coaxial Jet Pipes Numerical Study of a Vertical Laser Welding Process of AZ91 Magnesium Alloy

Convective Heat Transfer Enhancement using Slot Jet Impingement on a Detached Rib Surface

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