Energy Harvesting in Microscale with Cavitating Flows.

Area of Science:

• Fluid Dynamics
• Thermodynamics
• Energy Harvesting

Background:

• Thermal energy harvesting is crucial for energy savings and clean technologies.
• Growing individual energy demands necessitate innovative power solutions.
• Cavitating flows offer a potential avenue for energy generation.

Purpose of the Study:

• To propose a cost-effective and environmentally friendly solution for individual energy needs.
• To investigate the thermal energy harvesting potential of cavitating jet flows.
• To analyze the impact of microchannel dimensions and pressures on temperature rise.

Main Methods:

• Utilizing cavitating jet flows generated from microchannel configurations of varying diameters (152-762 μm).
• Employing an advanced high-speed visualization system to capture and analyze cavitation flow patterns.
• Measuring the temperature rise on a thin plate surface under different upstream pressures (10-60 bar).

Main Results:

• Achieved a significant temperature rise of up to 5.7 °C on the thin plate surface.
• Observed distinct cavitation flow patterns for different microtube diameters, including micro- to macroscale shifts.
• Demonstrated a correlation between flow patterns, microtube dimensions, upstream pressure, and temperature rise.

Conclusions:

• Cavitating jet flows from microchannels provide a viable method for thermal energy harvesting.
• The generated heat energy can be integrated with thermoelectric generators for powering consumer devices.
• Microchannel design and operating conditions significantly influence the efficiency of this energy harvesting technique.