الفهرس 
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Abstract
Control of turbulent, two-dimensional, steady forced convection cooling and air flow for heated blocks located in a channel was investigated experimentally and numerically. Forced convection air cooling of three in-line rectangular modules, one of these modules is heated, where the others are dummy. The heat transfer from the heated module simulates electronic chip mounted on a printed circuit board. The rectangular modules are placed on the lower wall of the flow passage with three different spacing to length ratios (S/L=0.5, 1.0 and 1.5). The heated module is placed in three different locations first, second and third respectively, over a range of Reynolds numbers from 9800 to 34950.
Computational work is carried out to predict the flow and heat transfer characteristics, and show the effect of both design parameters (spacing to length ratio, S/L, height ratio, h/H, and the heater position) and operating conditions (Reynolds number, Re) on forced convection heat transfer coefficient.
Numerical simulations for the present problem were carried out through the use of computational fluid dynamics code (FLUENT 6.3.26). Numerical simulations extended the experimental work to take into account the effect of element to duct height and the use of three heated modules together. Also, these simulations are based on two dimensional analysis, Standard k-ε model was utilized.
from both experimental and numerical results, it was found that the average Nusselt number for the first location of the heated module for all values of spacing to length ratios and over a Reynolds number range is the highest, also the heat transfer from the heated module is increases with increasing of the values of Reynolds number, the spacing to length ratio and the height ratio. The simulation results obtained are found in satisfactory agreement with the experimental results. Correlations were obtained for the average Nusselt number utilizing the present measurements and numerical data within the investigated range of the different operating and geometric parameters.