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Efficient Heat Transfer Solution

 

Heat Transfer enhancement:  single-phase and two-phase microchannel cooling using synthetic jets

The objective of this project is to develop innovative high heat flux removal cooling solutions that will dissipate over 300 W/cm2 from the die of high power electronics package while keeping the maximum die temperature < 120 oC.  

Thermal management of electronics is posing significant challenges with advancements in micro-processors and high-density power electronics. The heat flux from the power devices has risen significantly for future all-electric ships, which will rely on increasing amount of power electronic components. The power consumption trend shows that the relentless ijetncrease in heat density will keep on rising with advancement of technology. Novel cooling solutions are in demand for thermal management.

Of those advanced cooling solutions, micro thermo-fluidic technology, which puts liquid phase-change properties to work in microscale structures, is considered one of the most effective solutions for those devices demanding very high-flux heat removal. Liquid microchannel has a dense package with higher heat transfer coefficient. Depending on the application, the liquid flow inside the microchannels can be single-phase or two-phase. Due to the small flow passage, the flow through the channel is dominantly laminar flow in most applications. By combining microchannel flow with micro-impingement jets, the microchannel heat transfer performance is greatly enhanced through either introducing turbulence into single-phase flow, or stabilizing the flow instability of two-phase flow. 

We obtained around 40~50% heat transfer enhancement under specified jet operating conditions with a single jet imposing onto single-phase microchannel flow. The effects of multi-jets on the single phase microchannel flow are under investigating experimentally. It’s expected that the synthetic jet would have more promising enhancements. For microchannel flow boiling heat transfer, the synthetic-jets show some suppression on the flow instability which is caused by the rapid bubble generation and explosion. Ongoing research is trying to quantify the effects and explore the mechanism in detail. 

Related Publications:

  1. Ruixian Fang, Wei Jiang, Jamil Khan and Roger Dougal, ”Experimental Study on the Effect of Synthetic Jet on Flow Boiling Instability in a Microchannel”, 9th International Conference on Nanochannels, Microchannels, and Minichannels (ICNMM2011). June 19-22, 2011. Edmonton, Canada, accepted.

  2. Ruixian Fang, Wei Jiang, Jamil Khan and Roger Dougal,”The Effects of a Cross-Flow Synthetic Jet on Single-Phase Microchannel Heat Transfer”, Int. J. Heat and Mass Transfer. (Submitted November 2010).

  3. Ruixian Fang, Wei Jiang, Jamil Khan, Roger A. Dougal, “Experimental Heat Transfer Enhancement in Single-phase Liquid Microchannel Cooling with Cross-flow Synthetic Jet”, 14th  International Heat Transfer Conference (IHTC). Aug. 7-13, 2010.  Washington D.C., USA.

  4. Ruixian Fang, Wei Jiang, Jamil Khan, Roger A. Dougal “Experimental Heat Transfer Enhancement for Single Phase Liquid Micro-Channel Cooling Using A Micro-Synthetic Jet Actuator”, Proceedings of MNHMT2009. Dec. 18-21, Shanghai, China.

for more information: fangr@email.sc.edu

funded by : ESRDC