Comparison of Different Single-Phase Liquid Jet Impingement Cooling Configurations in the Context of Thermal Management in Power Electronics

2005 ◽  
Author(s):  
Sreekant V. J. Narumanchi ◽  
Desikan Bharathan ◽  
Vahab Hassani
Keyword(s):  
Heat Transfer ◽  
Free Surface ◽  
Power Electronics ◽  
Single Phase ◽  
Numerical Study ◽  
Jet Impingement ◽  
Cooling Power ◽  
Practical Implementation ◽  
Chip Surface ◽  
The Past

Jet impingement has been an attractive cooling option in a number of industries over the past few decades. Over the past fifteen years, jet impingement has been explored as a cooling option in microelectronics. Recently, interest has also been expressed by the automotive industry in exploring jet impingement as an option for cooling power electronics components. The main purpose of this paper is to compare the different single-phase jet impingement configurations, which have been reported in the literature, primarily from a heat transfer viewpoint. The discussion is also from the viewpoint of the cooling of IGBTs (insulated-gate bipolar transistors), which are found in inverters in hybrid automobiles. In the literature, single and multiple submerged as well as free-surface jets have been investigated. A number of correlations for heat transfer from the simulated chip surface have been presented. These correlations, as well as the results from them will be discussed in detail. We will also present results for the average heat transfer coefficient on the chip surface as a function of both coolant mass flow rate as well as velocity. All the results presented are for water jets. A numerical study of some of the single-jet cooling configurations (free-surface as well as submerged) is also performed and the CFD results are compared to the results obtained from the empirical correlations. The pressure drop associated with these jet impingement systems is also examined briefly. From the standpoint of practical implementation, high velocity jets have the potential to erode the material on which they impinge. This paper will briefly discuss erosion rates associated with jets impinging on aluminum and copper.

Jet Impingement Boiling From a Circular Free-Surface Jet During Quenching: Part 1—Single-Phase Jet

2001 ◽  
Vol 123 (5) ◽  
pp. 901-910 ◽  
Author(s):  
David E. Hall ◽  
Frank P. Incropera ◽  
Raymond Viskanta
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Free Surface ◽  
Boiling Heat Transfer ◽  
Single Phase ◽  
Jet Impingement ◽  
Nucleate Boiling ◽  
Transient Temperature ◽  
Spatial Distributions ◽  
Maximum Heat

This paper reports results from an experimental study of boiling heat transfer during quenching of a cylindrical copper disk by a subcooled, circular, free-surface water jet. The disk was heated to approximately 650°C, and as quenching occurred, transient temperature measurements were taken at discrete locations near the surface and applied as boundary conditions in a conduction model to deduce transient heat flux distributions at the surface. Results are presented in the form of heat flux distributions and boiling curves for radial locations varying from the stagnation point to ten nozzle diameters for jet velocities between 2.0 and 4.0 m/s 11,300⩽Red⩽22,600. Data for nucleate boiling in the stagnation region and spatial distributions of maximum heat flux are presented and are in good agreement with correlations developed from steady-state experiments. Spatial distributions of minimum film boiling temperatures and heat fluxes are also reported and reveal a fundamental dependence on jet deflection and streamwise location. A companion paper (Hall et al., 2001) describes single-phase and boiling heat transfer measurements from a two-phase (water-air), free-surface, circular jet produced by injecting air bubbles into the jet upstream of the nozzle exit.

Experimental and Numerical Study of Methanol-Water Mixture Single-Phase Heat Transfer in a Micro-Channel Heat Sink

2012 ◽  
Author(s):  
Chun K. Kwok ◽  
Matthew M. Asada ◽  
Jonathan R. Mita ◽  
Weilin Qu
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Sink ◽  
Single Phase ◽  
Numerical Study ◽  
Pure Water ◽  
Molar Fraction ◽  
Water Mixture ◽  
Micro Channel ◽  
Numerical Predictions

This paper presents an experimental study of single-phase heat transfer characteristics of binary methanol-water mixtures in a micro-channel heat sink containing an array of 22 microchannels with 240μm × 630μm cross-section. Pure water, pure methanol, and five methanol-water mixtures with methanol molar fraction of 16%, 36%, 50%, 63% and 82% were tested. Key parametric trends were identified and discussed. The experimental study was complemented by a three-dimensional numerical simulation. Numerical predictions and experimental data are in good agreement with a mean absolute error (MAE) of 0.87%.

Single-Phase and Boiling Cooling of Small Pin Fin Arrays by Multiple Nozzle Jet Impingement

1996 ◽  
Vol 118 (1) ◽  
pp. 21-26 ◽  
Author(s):  
David Copeland
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Single Phase ◽  
Jet Impingement ◽  
Transfer Coefficients ◽  
Pin Fin ◽  
Heat Transfer Coefficients ◽  
Aspect Ratios ◽  
Pin Fin Arrays

Experimental measurements of multiple nozzle submerged jet array impingement single-phase and boiling heat transfer were made using FC-72 and 1 cm square copper pin fin arrays, having equal width and spacing of 0.1 and 0.2 mm, with aspect ratios from 1 to 5. Arrays of 25 and 100 nozzles were used, with diameters of 0.25 to 1.0 mm providing nozzle area from 5 to 20 mm2 (5 to 20% of the heat source base area). Flow rates of 2.5 to 10 cm3/s (0.15 to 0.6 l/min) were studied, with nozzle velocities from 0.125 to 2 m/s. Single nozzles and smooth surfaces were also evaluated for comparison. Single-phase heat transfer coefficients (based on planform area) from 2.4 to 49.3 kW/m2 K were measured, while critical heat flux varied from 45 to 395 W/cm2. Correlations of the single-phase heat transfer coefficient and critical heat flux as functions of pin fin dimensions, number of nozzles, nozzle area and liquid flow rate are provided.

A Numerical Study of Eccentricity Effect to Heat Transfer Under Single Phase Force Convection Inside a Vertical Annulus

2013 ◽  
Author(s):  
Yang Liu ◽  
Qianqian Jia ◽  
Haijun Jia
Keyword(s):  
Heat Transfer ◽  
Single Phase ◽  
Stokes Equations ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Force Convection ◽  
Convection Heat ◽  
Eccentric Annulus ◽  
Eccentricity Effect ◽  
Vertical Annulus

Because annulus channel can be used to develop high efficiency compact heat exchangers, the heat transfer in annulus channel has become great interest to researchers in recent years. Most of the studies focus on the vertical concentric and horizontal eccentric annulus. The investigations about single phase force convection heat transfer inside a vertical eccentric annulus are not enough. In this work, force convection heat transfer is numerically studied to determine the eccentricity effect inside a vertical annulus. For this purpose, full Reynolds-averaged Navier-Stokes equations along with energy equations are solved in a 3-D grid. The discrete method of the equations is based on finite-volume method and the turbulence model is RNG k-ε model. The radius ratio of the annulus is 0.8 in this work. Heat flux of one wall is constant while the other is insulated. Firstly, the feasibility and exactness of the numerical method is proved by comparing the Nusselt number with experiment in concentric annulus. Then the effect of eccentricity is studied in detail.

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