Theoretical and Experimental Investigation of Two-Phase Sub-Cooled Heat-Pipe at Different Regimes

Abstract A new sub-cooled two-phase thermosyphon or heat-pipe devices are important for enhancing heat transfer. The properties are examined using theoretical modeling and experimental measurements of the sub-cooled heat loop during the heating-up, steady-state, and cooling-down phases. Experimentally, the sub-cooled heat-pipe's heating rate effective, cooling rate, and evaporator length are evaluated in heating-up, steady-state, and cooling-down modes. The dynamic model of the sub-cooled heat-pipe in the current practical investigation is important for several applications of irregular operation. This research seeks to create a theoretical framework, which accurately represents the double-tube evaporator's dynamic properties. This will be achieved by examining several transient parameters throughout the warm-up, stable condition, and cool-down phases of operation. The model effectively reproduces the phase and thermal properties of a closed, sub-cooled heat-pipe containing two phases. The experimental results of our practical setup based on the thermal evaporator wall and the working fluid show simple exponential behavior. The results from the experimental measurements and the theoretical model demonstrate their mutual accord.