ANALISIS NUMERIK PENGARUH KOEFISIEN KONVEKSI TERHADAP LAJU PERPINDAHAN PANAS PADA BATANG SILINDER BESI PEJAL

Abstract

This study conducts a numerical analysis using ANSYS Fluent to evaluate the influence of convection coefficient (h) on temperature distribution and heat transfer rate in a solid iron cylindrical rod with annular fins based on 2D simulation. The 2D planar model incorporates a cylinder length of 100 mm, diameter of 10 mm, fin height of 10 mm, and fin spacing of 10 mm. Boundary conditions include a fixed temperature of 300°C at both ends and variable convection coefficients (h=2, 3, 4 W/m²·K) on the cylinder and fin surfaces with an ambient temperature of 25°C. Results indicate a decrease in average cylinder temperature from 284.36°C (h=2) to 270.7°C (h=4), with temperature distribution contours showing steeper axial gradients at higher h values. The heat transfer rate increases linearly with h, reaching an estimated 9.83 W at h=4. These findings highlight the role of annular fins in enhancing cooling efficiency, with implications for heat exchanger and passive thermal system designs.