Analysis of Heat Transfer in Circular Heat Pipes at Various Inclination Angle using CeO2 Water Nano-fluid

The Heat transfer efficiency of thermal systems using fluids as working material, depends on its thermal conductivity. Hence a working fluid with good thermal conductivity is essential for efficient performance of thermal devices. Heat pipes are efficient thermal devices which are compact in size for transferring heat from one point to another. Nanomaterials, dispersed in base fluid give liquid suspensions called as nanofluids. Heat pipes engaged with the usage of nanofluids have brought a good attention of researchers due to its superior thermo physical properties which gave significant changes in thermal performance. Heat transfer mechanisms depend upon, type of heat pipes, nanofluids characteristics, design and operating parameters of heat pipes, etc. All the parameters have their own individual as well as the combined effect on thermal performance. The objective of this paper is to study the behavior of Cerium Dioxide (CeO2) nanofluid with water as base material used as working fluid, in order to improve the performance of circular heat pipe. The objective of this project is to study the behavior of Cerium Dioxide (CeO2) nanofluid with water as base material used as working fluid, in order to improve the performance of circular heat pipe. An experimental set up is designed and constructed in order to study performance of heat pipe, under different conditions such as concentration of working fluid (concentration of CeO2 in water), different operating temperatures and angle of inclination (00, 150, 300, 450, 600, 750, 900), heat power (25W, 50W, 75W, and 100W). The volume fraction of nano particles in the base fluid, and heat input rate on the thermal resistance is investigated. Thermal performance of heat pipe is studied for concentrations of 0.75, 1, and 2% volume fraction nanofluid.