| Abstrak/Abstract |
The need for efficient and compact cooling systems continues to increase along with technological developments that support Industry 4.0 and sustainable development such as data centers, high-performance computers, and electric batteries for various uses in daily life and industry. The cooling system is one of the main factors that ensure a system or product can work with high performance and be reliable. Boiling heat transfer cooling system is one of the best methods for thermal management with a high heat flux by dissipating heat via latent heat transfer as compared to single-phase convection cooling with air or liquid. The cooling method based on boiling heat transfer is a promising method for cooling with a high heat flux of more than 100 W/cm2. The advantage of using a cooling system based on boiling heat transfer can be increased by using surface modification to provide a high surface area to volume ratio of the system. In this work, experimental investigation of pool and flow boiling on porous graphite foam materials and the finned structures have been conducted comprehensively by using dielectric working fluids. The experiments to study the phenomenon of the boiling process, bubble characteristics, and thermal performance were carried out with various experimental variations such as porous graphite foam properties, type of working fluid, fin’s structure geometry, orientation angle, mass flow rate, and other experimental conditions. The boiling phenomena and bubble dynamic characteristics of porous graphite and fins structures such as bubble departure diameter and frequency, nucleation sites density, flow resistance, and wetted perimeter were observed and analyzed. Three dimensionless numbers of Bond number, Grashof number, and Capillary number were calculated to explore the boiling characteristics. The boiling heat transfer coefficient and pressure drop were calculated to determine the system's thermal performance. In this study, a dielectric working fluid is used with the intention that later, the cooling system can also be applied to direct cooling systems such as immersion cooling systems. Combining the high thermal performance of boiling heat transfer and the large heat transfer surface area will become a solution for the development of reliable, efficient, and sustainable cooling systems in the present and the future |
