ME381R Lecture 1 Overview of Microscale Thermal Fluid Sciences and Applications. Dr. Li Shi Department of Mechanical Engineering The University of Texas at Austin Austin, TX 78712 www.me.utexas.edu/~lishi [email protected] Microprocessor Evolution. Localized Heating in VLSI Chips.
Mean-time-to-failure due to electromigration increase x5
Dependence of mean time between failure on temperature
On chip temperature contour
Steve Kang et al. Electrothermal analysis of VLSI Systems, Kluwer 2000
1.00 GB Hard Drive
1.44MB Floppy Disk
Howard Banks, "Life at 100 billion bits per second", Forbes Magazine, Oct. 6, 1997
Affolter, WDM Solutions (supplement to Laser Focus World), P.65 June 2001, www.wdm-solutions.com
A. Shakouri, J. Christofferson, Z. Bian, and P. Kozodoy, “High Spatial Resolution Thermal Imaging of Multiple Section Semiconductor Lasers,” Proceeding of Photonic Devices and System Packaging Symposium (PhoPack 2002), pp22-25, July 2002, Stanford CA.
Courtesy: Prof. Ken Goodson, DARAPA Thermal Management Workshop
Thin film superlattice
Airplane Speed- Past, Present, Future
McMasters & Cummings, Journal of Aircraft, Jan-Feb 2002
The brick wall due to heating, fabrication cost, quantum mechanics …
Future challenges & opportunities: transportation, communication, energy, health care …
Direct Thermal to Electric Energy Conversion can continue?
Efficient Nanostructured Thermoelectric Power Generator
Spacecraft Power Source
Length Scale can continue?
Wavelength of Visible Light
Particle transport theories,
Width of DNA
Fourier’s Law for Heat Conduction can continue?Thermal conductivity
Q (heat flow)
Microscopic Origins of Thermal Fluid Transport can continue?
--The Particle Nature
MaterialsDominant energy carriers
In micro-nano scale thermal fluid systems, often L < mean free path of collision of energy carriers & Fourier’s law breaks down
Particle transport theories or molecular dynamics methods