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Surface Orientation Effect on Local Heat Transfer by Round Water Jet Impingement

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Abstract

This paper describes local heat transfer for a round water jet on upward-facing and downward-facing static plates. Impinging liquid jets have high heat transfer rates. One of the technological issues in the steel making process is uniformity in cooling between the top and bottom sides of a plate. The objective of this study is to investigate the surface orientation effect on transient heat transfer experimentally. Experiments were conducted for a range of water flow rate, surface orientation. Both surface orientations were conducted on the same apparatus. The heat transfer plate was stainless steel to deal with both supercritical flow and subcritical flow regions. The plate length was wide for laboratory scale. Initial plate temperature was 800 degrees Celsius. Pipe Reynolds numbers were laminar flow regime. Inverse solution was employed to estimate transient local surface temperature and heat flux. Heat transfers between upward-facing and downward-facing surfaces are the same in the order of magnitude at downward-facing surface flow rate from 1.2 times to twice that of upward-facing surface. Local downward-facing surface temperature is higher than that of upward-facing temperature at the same flow rate. The following points can be given as reasons. Downward-flowing impinging jet velocity is larger than that of upward-flowing jet at the same flow rate due to gravity direction. Heat transfer is affected by a geometric arrangement relation of radial spreading liquid film, vapor and hot plate.

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Acknowledgements

The research owes much to the thoughtful and helpful comments of Professor Emeritus Shoji, M. and Professor Emeritus, former Executive Director Nishio, S. The author would also like to thank the invaluable inputs from the reviewers. Their comments and suggestions have considerably improved the quality of this work.

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  1. Shigemasa Yamagami

    Present address: National Institute of Advanced Industrial Science and Technology, Tokyo, Japan

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  1. Faculty of Environmental Engineering, The University of Kitakyushu, Fukuoka, Japan

    Shigemasa Yamagami

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Correspondence to Shigemasa Yamagami.

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Yamagami, S. Surface Orientation Effect on Local Heat Transfer by Round Water Jet Impingement. Flow Turbulence Combust 102, 485–496 (2019). https://doi.org/10.1007/s10494-018-9976-5

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