Correlating Equations for Impingement Cooling of Small Heat Sources With Single Circular Liquid Jets

1993 ◽  
Vol 115 (1) ◽  
pp. 106-115 ◽  
Author(s):  
D. J. Womac ◽  
S. Ramadhyani ◽  
F. P. Incropera
Keyword(s):  
Free Surface ◽  
Integrated Circuit ◽  
Jet Impingement ◽  
Liquid Jets ◽  
Heat Sources ◽  
Impingement Cooling ◽  
Submerged Jet ◽  
Impingement Heat Transfer ◽  
Correlating Equations ◽  
Parameter Ranges

Experimental data have been obtained for liquid jet impingement cooling of small square heat sources resembling electronic integrated circuit chips. Both free-surface and submerged jet configurations have been studied for a range of velocities, nozzle diameters, and nozzle-to-heater separation distances, with water and a fluorocarbon liquid (3M FC-77) as coolants. Major trends in the data have been explained in terms of the underlying hydrodynamic and thermal phenomena. The data, obtained over parameter ranges applicable to the cooling of microelectronic chips, have been compared with the predictions of previously developed correlations for jet impingement heat transfer and substantial discrepancies between the data and the predictions have been noted. Based on the present data, two new correlating equations, one for free-surface and the other for submerged jet impingement, have been developed and presented.

Experimental and Theoretical Studies of Mist Jet Impingement Cooling

1996 ◽  
Vol 118 (2) ◽  
pp. 343-349 ◽  
Author(s):  
K. M. Graham ◽  
S. Ramadhyani
Keyword(s):  
Experimental Data ◽  
Jet Impingement ◽  
Target Surface ◽  
Heat Fluxes ◽  
Heat Sources ◽  
Impingement Cooling ◽  
Jet Cooling ◽  
Air Jet ◽  
Model Predictions ◽  
Experimental And Theoretical Studies

Experimental data and analytical predictions for air/liquid mist jet cooling of small heat sources are presented. The mist jet was created using a coaxial jet atomizer, with a liquid jet of diameter 190 μm located on the axis of an annular air jet of diameter 2 mm. The impingement surface was a square of side 6.35 mm. Experimental data were obtained with mists of both methanol and water. Surface-averaged heat fluxes as high as 60 W/cm2 could be dissipated with the methanol/air mist while maintaining the target surface below 70°C. With the water/air mist, a heat flux of 60 W/cm2 could be dissipated with the target surface at 80°C. Major trends in the data and model predictions have been explained in terms of the underlying hydrodynamic and heat transfer phenomena.

scholarly journals Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

2018 ◽  
Vol 240 ◽  
pp. 01032 ◽  
Author(s):  
Björn Pfeiffelmann ◽  
Ali Cemal Benim ◽  
Franz Joos
Keyword(s):  
Heat Exchanger ◽  
Thermoelectric Generator ◽  
Nonlinear Differential Equations ◽  
Jet Impingement ◽  
Heat Sources ◽  
Temperature Dependent ◽  
Conservation Of Energy ◽  
Impingement Cooling ◽  
Solid Region ◽  
Computational Fluid Dynamics Cfd

Designs of heat exchangers are quite often disconnected to the performance of thermoelectric generators (TEG). In this work, the TEG and the heat exchanger are numerical modelled simultaneously in a computational fluid dynamics (CFD) environment (OpenFOAM) to maximize the output power of the system while minimize the hydraulic power required. A preliminary work was done where the modelling of the heat exchanger, a single laminar slot jet, and the modelling of a 16 element TEG are validated. The considered heat exchanger is a laminar slot jet consists of a linear array of discrete heat sources which accord with the geometry of a thermoelectric generator. The considered 16 element TEG is modelled using the temperature dependent material properties which require a solution of a system of nonlinear differential equations, namely the conservation of energy and the conservation of electric current. The conjugate heat transfer OpenFOAM solver chtMultiRegionFoam is extended by an additional differential equation for the solid region to model the conservation of current. The conservation of energy is expanded by additional source terms based on Peltier/Thomson effect and Joule heat. To simplify the calculation, interface and 1D resistor load boundary conditions are developed and implemented. The heat exchanger and the TEG model, both, are validated by comparisons with measurements, where a good agreement is observed.

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