The performance of alkali heat pipe greatly depends on the properties of the wick material. In the present work, an experimental investigation is conducted to study the performance of high temperature sodium heat pipe with annular and composite wick structures. The operating limits of the heat pipe for these wick structures are evaluated and the effective working region of the heat pipe is identified. The experiments are conducted for annular and composite wick, different heat inputs, fill ratio and orientation. The results showed that the composite wick heat pipe is performing better in terms of its lower thermal resistance. The sodium heat pipe showed better heat transfer characteristics at a fill ratio of 40% and at an orientation of 30°.
Louvered fin heat exchanger is a type of compact Heat exchanger that consists of a stack of alternate flat plates called parting sheets and corrugated fins, both being brazed together as a block. Streams exchange heat by flowing along the passages made by the fins between the parting sheets. Separating plates act as the primary heat transfer surfaces and the appendages known as fins act as the secondary heat transfer surfaces intimately bonded to the primary surface. Aluminium is the most commonly used material and stainless steel is employed in high pressure and high temperature applications. CFD Simulation results show an excellent flow phenomenon with the basis of stability and accuracy. Results show the best combination of the angle for optimum pressure drop and heat transfer rate. In current study the temperature drop is increase with increase in louver angle, turbulent is high near to the winglet. As the velocity of air is increase the temperature drop is decreased. We found that when louvered angle, velocity, pressure, Temperatures are the best combination of the angle for optimum pressure drop and heat transfer rate.
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