Flow Characteristics and Control of Turbulent Annular Jet. Effects of a Coaxial Round Jet.

敏彦, 社河内; 智宏, 加藤

doi:10.1299/kikaib.63.3278

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…Impingement jet (1)(2)(3)(4) has been used widely in industrial fields such as manufacturing processes of with glass or steel requiring cooling, heating and drying, because it provides a high heat transfer coefficient. However, in general control of impingement heat transfer is very poor and only a few control methods, such as the changes in velocity profiles at the exit of a nozzle by using coaxial dual nozzles (Shakouchi (5) ), a non-circular nozzle and a three-dimensional nozzle (Colucci (6) , Oyakawa (7) ) have been reported.…”

Section: Introductionmentioning

confidence: 99%

Control of Impingement Heat Transfer Using Mist

Kanamori

Hiwada

Mimatsu

et al. 2009

JTST

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Impingement heat transfer from a circular orifice jet by using latent heat of water mists was studied experimentally. The amounts of mists of about Zauter's mean diameter 14 μm were from 60 to 200 g/h within a range where liquid films were not formed on the target plate and mists were added near the orifice edge. Experiments covered Reynolds numbers from 12,500 to 50,000 and a heat flux is 1,400 W/m 2 . The experimental results indicate that adding mists had little influence on free jet mean velocity profiles and target plate pressure coefficients. On the other hand, mists had a strong influence on temperature and humidity profiles of a free jet and they also influenced Nusselt number distributions on the target plate. Increases of mists and Reynolds number caused increases in Nusselt number on the developed region. In addition, we investigated influence of the way mists were added and these results showed that Nusselt number was influenced not only by the amounts of mists but also by the adding method. Local Nusselt number profiles with mists were closely related to temperature distributions of the free jet at the location corresponding to the target plate.

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Section: Introductionmentioning

confidence: 99%

Control of Impingement Heat Transfer Using Mist

Kanamori

Hiwada

Mimatsu

et al. 2009

JTST

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Experimental Analysis on Coating Weight Controllability of a Multi-slot Gas Wiping Nozzle

Takeda¹,

Takahashi²,

Miyake³

et al. 2014

JAPANESE JOURNAL OF MULTIPHASE FLOW

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This paper presents a study of the gas wiping process, which is used in coating processes to control the final coating weight applied on a substrate. Multi-slot type gas wiping nozzle was proposed for improving coating weight controllability, and investigated using numerical simulations recent years. We made two types of 3-slot wiping nozzle and measured 2-dimentional free-jet characteristics with a hot-wire anemometer. Then, gas wiping model experiments with paraffin wax coating were carried out. We found that a gap between main and auxiliary slot has significant effect on the jet stream characteristics. Although each slot gas pressure conditions were the same, velocity distribution of the jet becomes sharp if the gap is narrow. The coating thickness after 3-slot gas wiping decreased with a sharp pressure gradient of the jet.

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Flow Characteristics and Control of Turbulent Annular Jet. Effects of a Coaxial Round Jet.

Cited by 2 publications

References 1 publication

Control of Impingement Heat Transfer Using Mist

Control of Impingement Heat Transfer Using Mist

Experimental Analysis on Coating Weight Controllability of a Multi-slot Gas Wiping Nozzle

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