Nanofluids: A Review Wednesday, 3rd March 2010.

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Presentation transcript:

Nanofluids: A Review Wednesday, 3rd March 2010

What are Nanofluids? A “good” Nanofluid: (From: Choi, 2009)

Historical Prologue (From: Choi, 2009)

Historical Prologue (From: Choi, 2009)

Historical Prologue (From: Choi, 2009)

Historical Prologue (From: Choi, 2009)

Are Nanofluids Really New? Italy, 15th century…. “Nanofluid” in Luster Pottery

The Cooling Challenge In electronic: scaling and processing increases, power density doubles  cooling system is needed!!

Size Matters in Nanofluids Particle size matters in making nanofluids stable Size matters in making nanofluids with novel properties

Making and Characterizing Nanofluids The steps for producing nanofluids: Two-step Process One-step Process Tools for characterizing nanofluids: TEM DLS

Novel Thermal Transport Phenomena High Thermal Conductivity at Low Temperature Nonlinear Increase in Conductivity with Nanoparticle Concentrations Strongly Temperature-Dependent and Size Dependent

Volume Fraction Dependent (From: Choi, 2009)

Temperature Dependent (From: Choi, 2009)

Mechanisms and Models Ordered Nanolayer of Liquid Molecules Percolation-like Behaviour Interfacial Thermal Resistance Brownian Motion of Nanoparticles Nanoconvection Surface Charge Model Molecular-Level Mechanisms of Enhanced Conductivity

Mechanisms and Models Heat Transfer Model: Homogeneous Flow Dispersion Particle Migration Brownian Diffusion and Two Component Nonhomogeneous Equilibrium

Application Microelectronic cooling Engine coolant Automatic Transmission Fluid

Future Direction Basic Research Applied Research Volume Production Stability Environmental Issues

Conclusion

Thank You