الفهرس 
Chapter (1) IntroductionOnly 14 pages are availabe for public view
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Abstract
This study presents a theoretical and experimental investigation on the thermal performance of thermosyphon for use in cooling high heat flux electronic component. The charged working fluid in the evaporator is distilled water or nanofluid (Al2O3+water). 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 differential forms of governing equations are, numerically, solved using finite difference technique. According to this technique, the partial differential equations are transformed to set of linear algebraic equations. These equations are solved, numerically, by Gauss-Siedel iterative method. The experimental set up is designed and constructed to study the heat transfer in loop thermosyphon under different operating conditions. The operating parameters in the present work : - working fluid filling ratio (volume of working fluid to the evaporator volume from 30%, to 90%),volume fraction of nanoparticle in the base fluid from 0.0%, to 1.6%, heat input rate and volume of evaporator on total thermal resistance of the thermosyphon with the nanofluid and with distilled water. The results showed that, total thermal resistance decreases with increasing added of particles from 0.0% to 0.8% concentration, as compared with those of distilled water, but it increased as the concentration changed from 0.8% to 1.6%. The best concentration ratio is 0.8% of Al2O3 in pure water as nanofluid . Comparisons between present and previous work ,and also; theoretical and experimental results are made which exhibit fairly good agreement.