Experimental Study of Forced- Convection from Horizontal Rectangular Fins Array into Air Duct

Abstract

In this work, an experimental study has been done to expect the heat characteristics and performance of the forced-convection from a heated horizontal rectangular fins array to air inside a rectangular cross-section duct. Three several configurations of rectangular fins array have been employed. One configuration without notches and perforations (solid) and two configurations with combination of rectangular-notches and circular-perforations for two various area removal percentages from fins namely 18% notches-9% perforations and 9% notches-18% perforations are utilized. The rectangular fins dimensions and fins number are kept constant. The fins array is heated electrically from the base plate with five different magnitudes of power-inputs. Five several air flow velocity into a duct are utilized. The influence of fin geometry, air flow velocity, Reynolds number and the surface heat flux on the heat-performance of forced heat convection have been simulated and studied experimentally. The experimental data indicates that the combination of 18% rectangular-notched and 9% circular-perforated rectangular fins array gave best forced heat performance in terms of average heat transfer coefficient about (25% - 45%) and (7% - 20%) compared than solid and 9% notches with18% perforations fins array respectively. Five empirical correlations to predict the average Nusselt number for the 18% notches with 9% perforations rectangular fins array at wide range of surface heat flux are deduced. The present data are compared with previous works and a good closeness in behavior is noticed.

Review of Enhancement of Heat Transfer From Rectangular Fin Arrays

“…When notch depth increases heat transfer coefficient also increases. Shehab [52] investigated the rectangular notch portion effect on free convection heat transfer rate experimentally. In this study fin number and fin spacing effect were investigated for rectangular notched fins.…”

“…The study showed that as the notch size increases so does the heat transfer rate. While Wange and Metkar, Dixit et al, Shabab and Bakale et al [50][51][52][53] used aluminum as a fin material Kharce and Farkade [50] used copper for notched fin material instead. They reveal that a copper plate gives a better heat transfer rate than an aluminum one.…”

Cooling silicon photovoltaic cells using finned heat sinks and the effect of inclination angle

“…The heat sinks were manufactured from 0.9 mm thick aluminium and each of the manufactured heat sinks had a fin spacing of 10 mm. Initially, each of the heat sink's heat transfer coefficients were determined with the procedure developed in references [36][37][38][39][40]. Each of the heat sink's had a known heat input acting on the base of the heat sink, which is supplied using a silicone heater mat which is regulated by adjusting the current and voltage in an external power supply [41].…”

Review on Heat Transfer Enhancement by Rectangular Fin

“…It was found that when notch depth increases then heat transfer coefficient also increases. Shehab [42] concluded that the convective heat transfer coefficient of notched fin array is 28% to 45% higher than un-notched fins at the same conditions. It was also found that Average Nusselt number is about 45% higher in case of 37% notched fins array than un-notched fins array.…”