Document Type : Research Paper
Abstract
This study examines forced convection over smooth surfaces and horizontally arranged circular tubes, addressing various challenges. The primary aim is to analyze the heat transfer coefficient under specific forced convection conditions. Circular pipe test sections, each with an internal and external diameter of 0.009 meters and a total length of one meter, were used for evaluation. The working fluid, R113, entered at 25°C, with mass flow rates between 10 and 17.5 grams per second and heat inputs ranging from 25 to 100 watts. Reynolds numbers at the inlet and outlet varied within the ranges of 2115.80–2187.21, 2645.30–2789.30, 3174.79–3391.99, and 3704.28–3995.04. The research focused on the progression of transition and turbulent flow regions during all heat tests, tracking the expansion of laminar zones. An iterative prediction approach in Excel applied over 5,180 heat transfer corrections to determine the boundaries of these flow regions.
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