Abstract
In this current investigation, two metal foams (stainless steel) were treated and cleaned to be modified into superhydrophilic and superhydrophobic surfaces. The surface modifications of the metal foams were prepared using acetone cleaning and superhydrophobic coating methods. The two metal foam samples were then characterized to analyze the morphology, physical properties, wettability and capillary. The superhydrophilic metal foam was chosen as the wick structure in cylindrical heat pipe because of high wettability, and capillary behavior as characterized previously. In the cylindrical heat pipe, ferrofluid was used as the working liquid. The cylindrical heat pipe was tested at two heat input variations of 3 and 5 W in a horizontal direction. The heat pipe's performance test proposed that the optimum thermal resistance is 2.47 °C/W at a heat input of 5 W.
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