ABDELMOUMEN SHAD SERROUNE , I Rahman KHASANI, Sopaheluwakan Jan

This study presents a novel nitrogen hybrid gas nanofoam system designed for enhanced geothermal applications, validated through comprehensive laboratory testing. The system integrates a nitrogen gas matrix (95% by volume) infused with engineered aluminum oxide (0.6–0.8% vol) and silica (0.3–0.5% vol) nanoparticles, achieving superior thermal conductivity and fracture stability under simulated geothermal conditions.

Experimental validation, conducted from March to November 2024, subjected the nanofoam to extreme conditions, including pressures of 80–140 MPa and temperatures up to 240°C. Results demonstrated sustained fracture apertures of 3 mm with minimal degradation (only 12% over 15 weeks), while thermal conductivity remained at 30 W/m·K, representing an enhancement of 166–336% over conventional materials. The system exhibited exceptional stability, with Reynolds numbers exceeding 10⁴, Weber numbers above 50, and a uniform nanoparticle distribution (CV <15%), preventing coalescence (<0.1% per hour).

These findings confirm that the nitrogen hybrid gas nanofoam system significantly enhances heat transfer efficiency and long-term operational stability, offering a scalable solution for next-generation geothermal power generation. With validated performance exceeding conventional methods, this system is poised for commercial deployment, particularly in high-capacity geothermal projects such as the planned 200 MW EQG implementation.