Pool boiling is highly suitable for cooling in various industries due to its high heat transfer capability. Among pool boiling enhancement methods, embedding open-cell metal foams to the heater surface are particularly beneficial as they increase the effective heat transfer area. In this study, by analyzing 30 samples, the effect of pore density, thickness, and channels with different diameters on copper metal foams were investigated. In addition, the electrodeposition method was used to deposit a porous layer on the edges of copper metal foam to increase boiling efficiency in atmospheric conditions with deionized water as a working fluid. As an innovation, holes with different diameters were created inside the specimens using machining to construct a suitable exit path for the bubbles. According to the results, creating a channel with a diameter of 3 mm inside foams with thicknesses of 8 mm and 10 mm, both in the untreated and electrodeposited modes, improved the heat transfer coefficient (HTC) compared to foam without the channel. On the other hand, a 5 mm diameter channel decreased boiling efficiency due to a substantial reduction in effective surface area compared to a 3 mm channel. At low heat fluxes, the electrodeposited sample with a pore density of 20 ppi, a thickness of 10 mm, and a channel diameter of 5 mm achieved an HTC of 13.56 W/cm2. K that was approximately 3.5 times higher than the plain copper sample. A high-speed camera was utilized to observe the bubble departure from the channels during changing the heat flux. Finally, by considering the dimensionless parameters of the problem, an experimental correlation was derived to predict the HTC values.
