Abstract
Abstract This paper outlines an experimental investigation into fundamental nucleate boiling phenomena involving finned surfaces within a narrow channel. The study delves into the effects of both channel width (2.0 mm and 0.5 mm) and the orientation of the base surface (whether horizontal or vertical). Experimental trials were conducted using a saturated pool of FC-72. Comparative analysis is presented between the experimental data obtained in the confined narrow channel and the unconfined scenario of extended surfaces. Notably, the reduction in channel width exhibits negligible influence on heat transfer to the liquid when the base surface is vertically oriented. However, in the case of a horizontally oriented base surface, a substantial reduction in heat transfer behavior is observed. Beyond a critical point, vapor stagnation within the gap is identified, marking a noteworthy phenomenon after reaching the maximum heat flux. This paper contributes valuable insights into the nuanced effects of channel confinement on boiling heat transfer, particularly in relation to the orientation of the boiling surface.
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