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.
Highlights
The heat characteristics and performance enhancement is a very importance subject of thermal-engineering
The loss of heat radiation between surfaces of polished rolled aluminum fins array with emissivity of ε = 0.05 and the air temperature inside a duct (T∞) is computed from Stefan-Boltzmann law
The present work simulates experimentally effect of the fins configurations, the percentage of area removal from fin, surface heat flux and the air flow velocity on forced-convection heat performance of a heated horizontal fins array inside air duct
Summary
The heat characteristics and performance enhancement is a very importance subject of thermal-engineering. Shehab [11] experimentally studied the natural heat convection over rectangular fins arrays on a horizontal heated aluminum baseplate to ambient air with and without rectangular-notches portions influence He investigated multi parameters such as fins number, percentage of notch area from a fin and surface heat flux on the coefficient of convection heat transfer and Nusselt number. The aim of present work is to introduce an experimental study for the forced heat convection over a heated horizontal rectangular fins array to ambient into a rectangular crosssection air duct with nozzle-diffuser ends utilizing three different configurations of rectangular-fins arrays, one configuration is solid and two configurations with combination of rectangular-notches and circular-perforations for different area removal percentages from fin. The influence of air flow velocity and surface heat flux are taken into consideration and studied
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