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Study of low speed transitional regime gas flows in microchannels using information preservation (IP) method

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  1. Tez No: 400268
  2. Yazar: ÜMİT KURŞUN
  3. Danışmanlar: PROF. JAYANTA S. KAPAT
  4. Tez Türü: Doktora
  5. Konular: Makine Mühendisliği, Mühendislik Bilimleri, Mechanical Engineering, Engineering Sciences
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2006
  8. Dil: İngilizce
  9. Üniversite: University of Central Florida
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Makine Mühendisliği Teknolojileri Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 135

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Özet (Çeviri)

Proper design of thermal management solutions for future nano-scale electronics orphotonics will require knowledge of flow and transport through micron-scale ducts. As inthe macro-scale conventional counterparts, such micron-scale flow systems would requirerobust simulation tools for early-stage design iterations. It can be envisioned that an idealNanoscale thermal management (NSTM) solution will involve two-phase flow, liquidflow and gas flow. This study focuses on numerical simulation gas flow in microchannelsas a fundamental thermal management technique in any future NSTM solution. A wellknownparticle-based method, Direct Simulation Monte Carlo (DSMC) is selected as thesimulation tool. Unlike continuum based equations which would fail at large Knnumbers, the DSMC method is valid in all Knudsen regimes. Due to its conceptualsimplicity and flexibility, DSMC has a lot of potential and has already given satisfactoryanswers to a broad range of macroscopic problems. It has also a lot of potential inhandling complex MEMS flow problems with ease. However, the high-level statisticalnoise in DSMC must be eliminated and pressure boundary conditions must be effectivelyimplemented in order to utilize the DSMC under subsonic flow conditions.The statistical noise of classical DSMC can be eliminated trough the use of IP method.The method saves computational time by several orders of magnitude compared to asimilar DSMC simulation. As in the regular DSMC procedures, the molecular velocity isused to determine the molecular positions and compute collisions. Separating theivmacroscopic velocity from the molecular velocity through the use of the IP method,however, eliminates the high-level of statistical noise as typical in DSMC calculations oflow-speed flows.The conventional boundary conditions of the classical DSMC method, such as constantvelocity free-stream and vacuum conditions are incorrect in subsonic flow conditions.There should be a substantial amount of backpressure allowing new molecules to enterfrom the outlet as well as inlet boundaries. Additionally, the application of pressureboundaries will facilitate comparison of numerical and experimental results more readily.Therefore, the main aim of this study is to build the unidirectional, non-isothermal IPalgorithm method with periodic boundary conditions on the two dimensional classicalDSMC algorithm. The IP algorithm is further modified to implement pressure boundaryconditions using the method of characteristics. The applicability of the final algorithm insolving a real flow situation is verified on parallel plate Poiseuille and backward facingstep flows in microchannels which are established benchmark problems in computationalfluid dynamics studies. The backward facing step geometry is also of practicalimportance in a variety of engineering applications including Integrated Circuit (IC)design. Such an investigation in microchannels with sufficient accuracy may provideinsight into the more complex flow and transport processes in any future Nanoscalethermal management (NSTM) solution. The flow and heat transfer mechanisms indifferent Knudsen numbers are investigated.

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