Impingement heat transfer in an under-expanded axisymmetric air jet

Rahimi, Mona; Owen, I.; Mistry, J.

doi:10.1016/s0017-9310(02)00275-2

Cited by 35 publications

(21 citation statements)

References 16 publications

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“…For this reason, the wall shear stress cannot be characterized directly from friction velocity. Here, we formulate a power-law for momentum normalized wall shear stress, * : * = ∞ ( ∞ ) 2 . Figure 14 plots momentum normalized wall shear stress against momentum normalized x with and without source dependence, demonstrating that a power-law is appropriate for wall shear stress.…”

Section: Wall Shear Stressmentioning

confidence: 99%

Wall jet similarity of impinging planar underexpanded jets

Fillingham

Novosselov

2020

International Journal of Heat and Fluid Flow

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Velocity profiles and wall shear stress values in the wall jet region of planar underexpanded impinging jets are parameterized based on nozzle parameters (stand-off height, jet hydraulic diameter, and nozzle pressure ratio). Computational fluid dynamics is used to calculate the velocity fields of impinging jets with height-to-diameter ratios in the range of 15 to 30 and nozzle pressure ratio in the range of 1.2 to 3.0. The wall jet has an incomplete self-similar profile with a typical triple-layer structure as in traditional wall jets. The effects of compressibility are found to be insignificant for wall jets with Ma<0.8. Wall jet analysis yielded power-law relationships with source dependent coefficients describing maximum velocity, friction velocity, and wall distances for maximum and half-maximum velocities. Source dependency is determined using the conjugate gradient method. These power-law relationships can be used for the mapping of wall shear stress as a function of nozzle parameters.

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Section: Wall Shear Stressmentioning

confidence: 99%

Wall jet similarity of impinging planar underexpanded jets

Fillingham

Novosselov

2020

International Journal of Heat and Fluid Flow

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“…The experimental test rig was provided with a PC, a data acquisition system and the necessary attachments to measure temperatures at a sample time of 2.0 seconds, via multi I/O digital card. A PC-based data acquisition system utilizing PLC-818PG and a data logger was used for data collection and slow or rapid data monitoring, [14,15]. The thermocouples were connected to a data acquisition system through two multiplexers (multiplexer 4051) via buffers and amplifiers.…”

Section: Experimental Test Rigmentioning

confidence: 99%

“…The air issue from the nozzle is near enough to the uphill-zone. Referring to figures(14)(15)(16), one can notice at the fins tip; for…”

mentioning

confidence: 99%

Cooling Characteristics of Partially Hollow Finned Plate Exposed to Jet Impingement

Gomaa¹,

Gomaa

Eid

2008

JES. Journal of Engineering Sciences

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“…Jet Impingement is one of the most efficient solutions of cooling hot objects in Industrial processes as it produces a very high heat transfer rate of forced convection. Impingement heat transfer in axisymmetric air jet using thermocouples to measure the temperature with jet positioning is explained in [1]. The development of radially complete results for the liquid film heat transfer with uniform heat flux is explained by [2].The time averaged and temporal measurements of the heat transfer and fluid flow of an impinging air jet is explained in [3].…”

Section: Introductionmentioning

confidence: 99%