Heat Transfer of the Impinging Round Water Jet in the Interference Zone of Film Flow along the Wall

Ishigai, Seikan; Nakanishi, Satoshi; Mizuno, Minoru; Imamura, Toyoo

doi:10.1299/jsme1958.20.85

Cited by 53 publications

(23 citation statements)

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“…Some studies have analyzed single-jet impingement onto a moving hot solid. [5][6][7] In addition, Ishigai et al, 8) Sakhuja et al, 9) Monde et al, 10) and Haraguchi and Hariki 11) examined multiple pipe laminar jets impinging onto a stationary hot steel plate. Recently, Vakili and Gadala 12) investigated boiling heat transfer on a hot moving plate, caused by multiple impinging water jets in rows.…”

Section: Weakmentioning

confidence: 99%

Boiling Heat Transfer during Impingement of Two or Three Pipe Laminar Jets onto Moving Steel Sheet

et al. 2016

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Section: Weakmentioning

confidence: 99%

Boiling Heat Transfer during Impingement of Two or Three Pipe Laminar Jets onto Moving Steel Sheet

et al. 2016

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“…Watson [4] added the influence of viscosity as describing the jump. Considering gravity, Ishigai [5] used Froude number to classify the jump. Reversed flow in the transition of jump was observed by Nakoryakov.…”

Section: Introductionmentioning

confidence: 99%

Bifilm Defect Formation in Hydraulic Jump of Liquid Aluminum

Hsu

2016

Metall Mater Trans B

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In aluminum gravity casting, as liquid aluminum fell through a vertical sprue and impacted on the horizontal flat surface, a phenomenon known as hydraulic jump (i.e., flow transition from super-critical to sub-critical flows) was observed. As the jump was transformed, a reverse eddy motion on the surface of the jump was created. This motion entrained aluminum oxide film from the surface into aluminum melt. This folded film (so-called ''bifilm'' defect) was engulfed by the melt and caused its quality to deteriorate. To understand this phenomenon, aluminum casting experiments and computational modeling were conducted. In the casting experiment, a radius (R j ) to the point where the circular hydraulic jump occurred was measured. This is the circular region of 'irregular surface feature', a rough oxidized surface texture near the center area of the castings. To quantify contents of the bifilm defects in the outer region of the jump, the samples in this region were sectioned and re-melted for doing re-melted reduced pressure test (re-melt RPT). An ''area-normalized'' bifilm index map was plotted to analyze bifilms' population in the samples. The flow transition in the hydraulic jump of liquid aluminum depended on three pressure heads: inertial, gravitational, and surface-tension pressures. A new theoretical equation containing surface tension for describing the flow transition of liquid metal was proposed.

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“…Because the previous study dealt with single-jet impingement, in the present study, we addressed the characteristics of multiple impinging jets, which have not been clarified so far. Although multiple-jet impingement on a solid surface has been studied by other researchers, 10,11) detailed knowledge on the associated flow mechanics is still lacking.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Twin Circular Water Jets Impinging on a Moving Thin Film

Fujimoto¹,

Lee²,

Kato³

et al. 2013

ISIJ Int.

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In this study, we investigated the flow characteristics of two circular water jets impinging on a moving surface covered with a water film as fundamental research on strip cooling. Experiments and numerical simulations were conducted under non-heated surface conditions. The experiments were recorded on video. The jet velocity, nozzle-to-plate distance, nozzle-to-nozzle spacing, and flow rates of the water film were varied systematically. Depending on the flow conditions, three types of flows were found to exist between the two modes: stable, unstable, and transient. We propose a simple theoretical model for predicting the critical boundary at which the flow is in the "stable mode." In the numerical simulation, the Navier-Stokes equation system for a three-dimensional incompressible unstable viscous fluid was solved using a finite difference method. The effects of viscosity, gravity, and presence of a free liquid surface with surface tension were considered. The flow characteristics of the "unstable mode" are discussed in detail to offer a better understanding of its physics.

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Heat Transfer of the Impinging Round Water Jet in the Interference Zone of Film Flow along the Wall

Cited by 53 publications

References 0 publications

Boiling Heat Transfer during Impingement of Two or Three Pipe Laminar Jets onto Moving Steel Sheet

Boiling Heat Transfer during Impingement of Two or Three Pipe Laminar Jets onto Moving Steel Sheet

Bifilm Defect Formation in Hydraulic Jump of Liquid Aluminum

Experimental and Numerical Study of Twin Circular Water Jets Impinging on a Moving Thin Film

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