NDLI: Experimental Aero-Thermal Characterization of a Circular Jet Impinging a Plate: Influence of Impingement Flow Mach Number on Convective Heat Exchange Radial Distribution

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Lalizel, Gildas David, Christophe Fe´not, Matthieu Dorignac, Eva
Copyright Year	2008
Abstract	Impingement jets are known to be efficient mechanisms for the exchange of heat between fluid and structure. They are generally used in industry for cooling, heating or drying. Several experimental and numerical studies have been realized to study convective heat transfers and/or to correlate the convective heat transfers to the wall with the unsteady flow of the jet (O’Donovan et al. [9] [10]). But these studies have been performed at low Mach number whereas higher Mach number are found in industrial applications as fan cooling processes for instance (M = 0.5 to 0.8). So, we propose to study the influence of Mach number of the impingement flow, ranging from 0.1 to 0.8, on convective heat exchange between a circular jet and a round axisymmetric plate. The aerodynamic of the fluid and the heat transfers depend on the following parameters: the D hydraulic diameter of the jet, the H distance to the wall, the Re Reynolds number of the flow, the M Mach number and the Tj temperature of the jet. The local convective heat transfer coefficients are experimentally determined by an inverse method based on a measurement of steady state temperature fields by infrared thermography (Fe´not et al. [2]) for 1 ≤ H/D ≤ 5 and 0.1 ≤ M ≤ 0.8. An experimental study of radial velocity fluctuations of the fluid in nearby wall has also been realized from hot wire anemometry. A spatial and temporal turbulent study (turbulence spectrum, integral turbulent scales, dissipation rate) allows to correlate convective heat transfer to the wall to aerodynamic phenomena.
Sponsorship	Heat Transfer Division
Starting Page	625
Ending Page	630
Page Count	6
File Format	PDF
ISBN	9780791848470
DOI	10.1115/HT2008-56472
e-ISBN	0791838323
Volume Number	Heat Transfer: Volume 1
Conference Proceedings	ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Turbulence Temperature Cooling Reynolds number Unsteady flow Wire Flow (dynamics) Steady state Convection Heat Fluids Energy dissipation Heating Fluctuations (physics) Jets Heat transfer Mach number Drying Thermography
Content Type	Text
Resource Type	Article

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