NDLI: Confinement Effects in Heat Transfer to a Miniature Compressible Impinging Air Jet

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Thomas, L. Lupton Darina, B. Murray Anthony, J. Robinson
Copyright Year	2007
Abstract	The decreasing physical size of microchips accompanied by the increasing heat flux to be dissipated has led to the study of possible new innovative electronic cooling methods. Jet cooling has been successfully implemented in a variety of industrial applications and its capacity to maintain high heat transfer rates demonstrates its vast potential for incorporation into future cooling applications. The reduction in size of electronic components leads to the inevitability of jets used in this area being subjected to a degree of jet confinement. In this study the effects of confinement on the local heat transfer characteristics were experimentally investigated for a turbulent, fully developed, axisymmetric, compressible and submerged miniature air jet impinging normally onto an ohmically heated flat plate. The resulting surface temperature distribution was recorded via infrared thermography. Two 1mm diameter nozzles were examined, one confined and one unconfined. Tests were conducted for nozzle exit to impingement surface spacings of 1, 2, 4 and 6 jet diameters and for Reynolds numbers of 7,000 and 12,000 which corresponded to Mach numbers of 0.3 and 0.5. The heat transfer analysis accounts for compressibility effects by using the adiabatic wall temperature as the reference temperature in calculation of the heat transfer coefficients. Local heat transfer distributions are presented as a function of radial distance from the stagnation point. The results obtained indicate that confinement contributes to a flatter distribution of heat transfer over the impingement surface.
Sponsorship	Heat Transfer Division
Starting Page	671
Ending Page	679
Page Count	9
File Format	PDF
ISBN	0791842754
DOI	10.1115/HT2007-32754
e-ISBN	0791838013
Volume Number	ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 2
Conference Proceedings	ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference
Language	English
Publisher Date	2007-07-08
Publisher Place	Vancouver, British Columbia, Canada
Access Restriction	Subscribed
Subject Keyword	Confinement Heated foil Adiabatic wall temperature Electronic cooling Lateral conduction Impinging jet Heat transfer Ir thermography Wall temperature Computer cooling Air jets Thermography
Content Type	Text
Resource Type	Article

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