Experimental Investigation Of An Ultra-thin Vapor Chamber With Water And Pure 2-propanol As Working Fluids

Vapor chambers present a highly effective solution for dissipating high heat flux in thin, high-powered electronic devices. In this context, an ultra-thin vapor chamber measuring just 1.5 mm in thickness was developed specifically for experimental investigations. Certain pure alcohols have shown potential thermal Marangoni effects, primarily due to temperature gradients within the fluid bulk. This phenomenon is anticipated to yield improved evaporation characteristics compared to conventional pure fluids. To explore this possibility, the study selected two distinct working fluids, water, and pure 2-propanol, for experimentation. The focus was on observing the influence of the working fluid's charge ratio on key parameters such as the vapor chamber's thermal resistance, evaporator temperature, evaporator heat transfer coefficient, and condenser temperature.The findings revealed a strong correlation between the charge level of the working fluid and the vapor chamber's thermal performance, considering a fixed input power. Pure 2-propanol exhibited lower thermal resistance and evaporator temperature at lower charge levels than pure water. However, at very high charge levels, both of these parameters were lower for pure water. Predictions of the Marangoni number strongly support this charge-dependent thermal behavior exhibited by the two pure fluids.