Experimental Study of Novel Aqueous-Alcoholic Mixtures in a Horizontal and Inclined Ultra-Thin Vapor Chamber

Abstract An ultra-thin vapor chamber setup with aqueous alcohol mixtures as working fluids is experimentally investigated. The thermal performance of the vapor chamber with three 1-butanol–water mixtures of different concentrations is compared against 4.2M 2-propanol–water, which was the previously obtained best fluid. Among the three 1-butanol–water solutions, the 1.5wt% mixture has the best thermal performance in the horizontally positioned ultra-thin vapor chamber. The effect of vapor chamber inclination was examined, with the vapor chamber rotated to 30 deg and 45 deg. The thermal performance deteriorates with an increase in inclination. Further, at each inclination, the 1.5wt% 1-butanol solution outperforms the 4.2M 2-propanol solution.