Study of Heat Transfer and Bubble Dynamics in Pool Boiling with Orientation Angle Variations Using Dielectric Fluids on Porous Metal Foams
Abstract
Abstract: The advancement of technology in various fields has increased the demand for efficient thermal management systems, one of which is two-phase cooling through pool boiling. This study investigates the effect of heater orientation angle variation on the heat transfer coefficient (HTC) and bubble dynamics using the dielectric working fluid HFE-7100 and metal foam as the test material. Experiments were conducted at orientation angles of 0°, 15°, and 30° using image processing techniques and measurement instruments such as thermocouples, pressure transducers, and a data acquisition system. The measurement data results show that as the orientation angle (θ) of the heater and test material increases, the HTC value decreases. The orientation angle (θ) = 0° has the highest ℎ value of 4.019 kW/m²K, while the orientation angle (θ) = 30° has the lowest ℎ̅ value of 1.042 kW/m²K. Image processing data show that as the orientation angle (θ) increases, the bubble distribution and growth area on the metal foam decrease. This reduction in bubble distribution and growth affects surface temperature and heat flux, which increase, but the overall heat transfer performance declines.
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