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Numerical simulation of confined nano-impinging jet in microscale cooling application using DSMC method

Darbandi, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1115/FEDSM-ICNMM2010-31098
  3. Publisher: 2010
  4. Abstract:
  5. In this study, we simulate rarefied gas flow through a confined nano-impinging jet using direct simulation Monte Carlo (DSMC) method. The effects of geometrical parameters, pressure ratio, and wall conditions on the heat transfer from a hot surface are examined. Hot surface modeled via diffusive constant wall temperature. Various inlet/confining surface conditions such as specular, adiabatic, and constant temperature are implemented and the effects of them on the wall heat flux rates are studied. The results show that Knudsen number, velocity slip, and temperature jump are main reasons which specify magnitudes of wall heat flux rates. Among all geometrical parameters, H/W ratio has the greatest effect on heat transfer, where H is jet distance from the hot surface and W is the jet width. For different values of pressure ratio, the biggest quantity of wall heat flux rate relates to the lowest velocity slip case. Also for inlet/confining walls with constant temperature condition equal to coolant flow temperature, heat transfer from the hot surface was the maximum. Copyright
  6. Keywords:
  7. Constant temperature ; Constant wall temperature ; Coolant flow ; Cooling applications ; Direct simulation Monte Carlo method ; DSMC method ; Geometrical parameters ; Hot surface ; Knudsen numbers ; Micro-scales ; Pressure ratio ; Rarefied gas flow ; Surface conditions ; Temperature jump ; Velocity slips ; Wall heat flux ; Computer simulation ; Heat transfer ; Microchannels ; Monte Carlo methods ; Numerical methods ; Heat flux
  8. Source: ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels Collocated with 3rd Joint US-European Fluids Engineering Summer Meeting, ICNMM2010, 1 August 2010 through 5 August 2010, Montreal, QC ; Issue PARTS A AND B , 2010 , Pages 359-366 ; 9780791854501 (ISBN)
  9. URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1621457