Sharif Digital Repository

In the leading thesis, an attempt is made to improve the evaporation rate by emphasizing the reduction of heat transfer to the fluid bulk. In this study, inspired by the process performed in plants in the transfer of water from the roots to the leaves and especially the function of plant vessels, a kind of evaporator-improving surface was designed. The general function of this surface is to prevent the heat radiated to the surface of the water from being spent on heating the fluid deep in the water, and by concentrating this heat in a thin layer of fluid on the surface, the rate of evaporation increases. This surface consists of three parts: evaporative layer, insulation and water suction... 

The purpose of this study, is to investigate and analyze the thermal resistance of phenolic composite insulation reinforced with high silica fibers. The properties of composites depend on the properties of their components .Therefore, by changing the type and percentage of its components, the performance of the insulation changes. Today, these types of composites are used as sacrificial thermal insulation in nozzles, motors, warheads or rocket launchers and rocket wings. In this project, phenolic composite bed flat samples have been made to test the thermal resistance and ablation. In this study, IL800 / 3 phenolic resin, high silica fabrics and 600 g / m2 carbon were used. Highsilica...