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Nanofluids: A Review Wednesday, 3rd March 2010
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What are Nanofluids? A “good” Nanofluid: (From: Choi, 2009)
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Historical Prologue (From: Choi, 2009)
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Historical Prologue (From: Choi, 2009)
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Historical Prologue (From: Choi, 2009)
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Historical Prologue (From: Choi, 2009)
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Are Nanofluids Really New?
Italy, 15th century…. “Nanofluid” in Luster Pottery
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The Cooling Challenge In electronic:
scaling and processing increases, power density doubles cooling system is needed!!
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Size Matters in Nanofluids
Particle size matters in making nanofluids stable Size matters in making nanofluids with novel properties
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Making and Characterizing Nanofluids
The steps for producing nanofluids: Two-step Process One-step Process Tools for characterizing nanofluids: TEM DLS
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Novel Thermal Transport Phenomena
High Thermal Conductivity at Low Temperature Nonlinear Increase in Conductivity with Nanoparticle Concentrations Strongly Temperature-Dependent and Size Dependent
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Volume Fraction Dependent
(From: Choi, 2009)
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Temperature Dependent
(From: Choi, 2009)
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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
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Mechanisms and Models Heat Transfer Model: Homogeneous Flow Dispersion
Particle Migration Brownian Diffusion and Two Component Nonhomogeneous Equilibrium
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Application Microelectronic cooling Engine coolant
Automatic Transmission Fluid
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Future Direction Basic Research Applied Research Volume Production
Stability Environmental Issues
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Conclusion
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Thank You
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