الفهرس 
Introduction and literature review
GeneralOnly 14 pages are availabe for public view
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Abstract
The thermal performance of flat heat pipe in cooling of electronic heat source is presented. The working fluid charged in the evaporator is pure water or nano fluid(AL2O3+water). The theoretical and experimental models are investigated to study the thermal performance of a flat heat pipe. In theoretical model, the flow is described by continuity, momentum and energy equations. The flow is assumed laminar, steady and two dimensional with constant properties. The governing equations are numerically solved using finite difference technique. According to this technique, the partial differential equations are transformed to sets of linear algebraic equations. These equations are solved numerically, by Gauss-Siedel iterative method. An experimental setup is designed and constructed to study its performance under different operating conditions. The effect of working fluid, filling ratio, volume fraction of nano-particle in the base fluid, and heat input rate on the average heat transfer coefficient and in turn the average Nusselt number are investigated. Total thermal resistance of the heat pipe for pure water and Al2O3-water based nanofluid are also predicted. Correlation is obtained to predict the influence of Prandtl number, filling ratio and dimensionless heat coefficient, Kq for Nusselt number. Results showed that the average heat transfer coefficient, using Al2O3-water based nanofluid enhanced by 10.5 % up to 37 % compared to that of pure water, depending on filling ratio and volume fraction of nano-particles in the base fluid. The experimental data are compared with the available literature and discrepancies between results are discussed. The comparison between experimental correlation and the previous one is fairly good agreement.