Thermal analysis of nanofluids in microfluidics using an infrared camera

Area of Science:

• Nanofluidics
• Heat Transfer
• Microfluidics

Background:

• Investigating thermal properties of nanofluids is crucial for advanced cooling technologies.
• Conventional thermal measurement systems face limitations in microfluidic environments.
• Low Reynolds number regimes in microchannels are relevant for microfluidic cooling platforms.

Purpose of the Study:

• To perform thermal analysis of aluminum oxide (Al(2)O(3)) nanofluids in a microfluidic platform.
• To evaluate the effectiveness of infrared thermography for non-contact temperature profiling in microchannels.
• To investigate nanofluid behavior under low flow rate conditions relevant to microfluidic cooling.

Main Methods:

• Utilized a microfluidic platform with small channel dimensions and low flow rates (< 120 μl min⁻¹).
• Employed an infrared camera for non-contact, high-resolution, three-dimensional temperature profiling.
• Conducted experiments with varying weight/weight (w/w) concentrations of Al(2)O(3) nanoparticles.
• Validated experimental results using computational fluid dynamics (CFD) simulations.

Main Results:

• Achieved very low Reynolds numbers (< 17.5), characteristic of microfluidic cooling applications.
• Demonstrated the capability of infrared thermography for detailed thermal analysis in microfluidic systems.
• Observed excellent agreement between experimental data and CFD simulations across different nanoparticle concentrations.

Conclusions:

• Infrared thermography is a suitable technique for analyzing heat transfer in microfluidic systems with nanofluids.
• The study provides valuable data for the thermal management of microfluidic devices using Al(2)O(3) nanofluids.
• Experimental findings align with CFD simulations, validating the predictive capabilities for such systems.