Effect of introducing varying number of fins over LED light bulb on thermal behavior

Abstract

This paper, utilize simulation technique to estimate the Nusselt number for cylinders of vertically situated plate fins with varying fin parameters like height and no. of fins. For this purpose, ANSYS, varying fin heights, and temperatures of base are utilized to perform broad examinations for various fin numbers for evaluation of thermal behaviour like heat transfer coefficient (htc), thermal resistance (Rth) and efficiency (η). The present method is relevant when the Ra number having range 100,000–300,000, H/D (fin height to diameter of cylinder) ratio having range 1/6–1/2, and no. of fins ranges from 9 to 18, base temperature range 284.8 K to 301.9 K, heat flux respectively. Here Nusselt number is determined through simulation technique utilizing ANSYS for validate the previous Nusselt number, so that further examination was evaluated for thermal behaviour like htc, Rth and ηth of LED light fins. Omega and Stratton Allmaras model is utilized to calculate the Nusselt number. It has been observed from the present investigation that as the number of fins and height to diameter ratio of the cylinder increases the heat transfer coefficient having range 15.49–25.30 W/m-K and efficiency having range 32.9% to 49.5% increases with decrement on thermal resistance having range 13.65–2.48 oCW−1 and the geometry having 18 fins with 1/3H/D ratio with base temperature 294 K shows best and optimum results among all of them regarding reliability and quality aspect.