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Numerical Simulation of Nano-Impinging-Jet in Electronic Cooling Applications

Akhlaghi, Hassan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40535 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud
  7. Abstract:
  8. With a fast progress in nanotechnology devices and components, e.g., MEMS/NEMS, heat transfer study in micro/nanoscales has become so critical for the systematic design and precise control of such miniaturized devices towards the integration and automation of Lab-on-a-chip devices. Demands in high heat transfer rates have returned the concerns to impinging jet cooling systems. However, studying impinging jets in the micro/nano scales is requires the molecular dynamics knowledge to analyze the true micro/nanoscale flow behavior accurately. According to the importance of this subject, we use direct simulation Monte Carlo (DSMC) method to simulate nano impinging jet gas flows. The thesis is broke in two main parts. First, we describe how we developed a DSMC solver. Second, we apply it to micro/nanoscale impinging jet application. In this study, we develop a new boundary treatment called “Free Outflow Condition” for outgoing supersonic flows through the micro/nanochannels. Indeed, developing a new approach to implement constant heat flux rate on the wall is the main innovation of this thesis. To show the performance of current work, we first investigate micro/nanoscale heat transfer phenomena for rarefied gas flows through micro/nanochannels. The results show that there are three main parameters, including rarefaction, velocity slip, and temperature jump which affect wall heat transfer rate in micro/nanoscales. We also evaluate the effects of other parameters such as geometrical/flow parameters and wall conditions on the heat transfer rate from hot surfaces via applying nano impinging jet. The results show that, confined jets can perform better than unconfined ones. Also, mean surface temperature depends on wall heat flux rate linearly. Additionally, gas flow becomes more rarefied as wall heat flux increases
  9. Keywords:
  10. Micro/Nanochannel ; Heat Transfer ; Direct Simulation Monte Carlo (DSMC)Method ; Nano Impinging Jet ; Rarefied Gas

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