NDLI: A Study on Resonance Impinging and Wall Jets

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Shakouchi, Toshihiko Maruyama, Takumi Ando, Toshitake Tsujimoto, Koichi Watanabe, Atsushi
Copyright Year	2003
Abstract	Various kinds of impinging jets are used widely in many industry fields, such as the cooling of a heated plate or electronic components, drying of textiles, film, and paper because of their high heat and mass transfer rates at and near the stagnation point. Many studies on impinging jets from circular and orifice nozzles have been made [1]–[6]. It is well known that as nozzle-plate spacing decreases considerably the heat transfer rate becomes much larger, for example the maximum heat transfer rate of a circular impinging air jet with a low nozzle-plate spacing h/d = 0.1 (d: nozzle exit diameter) and Reynolds number Re = umd/ν = 2.3 × 104 is about 2.17 times of that for h/d = 0.2, but at the same time the flow resistance or operating power of the nozzle-plate system increases considerably. In order to improve or enhance the heat transfer rate, it is needed to increase the impinging mean and fluctuating velocities without increasing the operating power. To achieve this object it is considered to use a resonance jet. In this paper, the flow, acoustic and heat transfer characteristics of resonance free, impinging and wall jets are made clear experimentally. Moreover, flow visualization of the water jet flow by a tracer method is also made to examine the vortex structure at the shear layer and inside the resonance room. As a result, the heat transfer rate of the impinging jet by a resonance nozzle can be improved and enhanced considerably.
Sponsorship	Fluids Engineering Division
Starting Page	2645
Ending Page	2652
Page Count	8
File Format	PDF
ISBN	0791836967
DOI	10.1115/FEDSM2003-45226
e-ISBN	0791836738
Volume Number	Volume 1: Fora, Parts A, B, C, and D
Conference Proceedings	ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
Language	English
Publisher Date	2003-07-06
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Water Cooling Electronic components Reynolds number Air jets Acoustics Flow (dynamics) Mass transfer Textiles Heat Vortices Flow visualization Jets Nozzles Resonance Shear (mechanics) Heat transfer Drying
Content Type	Text
Resource Type	Article

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