Heat Pipe Lab Report

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Thermal Performance Enhancement of Heat Pipe Using TiO2 Nanofluid A. Dinesh Kumar*, A. Victor Richardson** & A. Philomin Freeda*** * Assistant Professor, Department of Mathematics, Dhanalakshmi Srinivasan Engineering College, Perambalur, Tamilnadu, India. Email: dineshkumarmat@gmail.com ** PG Scholar, Department of Mechanical Engineering, TRP Engineering College, Trichy, Tamilnadu, India. Email: mathsphd1@gmail.com *** Assistant Professor, Department of Physics, Dhanalakshmi Srinivasan Engineering College, Perambalur, Tamilnadu, India. Email: philominfreeda@gmail.com Abstract: Heat pipe is a heat transfer device which transports large quantities of heat with minimum temperature gradient without any additional power between the two temperature…show more content…
This causes dry out condition in the evaporator, known as boiling limit. As the vapor passes in the counter flow direction to the liquid, high shear forces are developed. This entrains the liquid and resulting in insufficient liquid flow to the wick structure, known as entrainment limit. Operation of heat pipe at low temperatures creates low vapor pressure which may be insufficient to support the increased vapor flow. This condition is called viscous limit. Choking of heat pipe may occur due to low vapor densities and this is called the sonic limit of heat…show more content…
Nanofluid preparation involves two methods: single step and two step method. The single step method is a process that combining the preparation of nanoparticles with the synthesis of nanofluids. Physical vapor deposition, liquid chemical method and chemical reduction method are some of the methods available to prepare the nanofluid by single step method. The fluid which is prepared by this method gives better stability and reduced agglomeration (collection of tiny particles to form a bulk mass that will settle more rapidly). But the single step method can be used only for low vapor pressure fluids. This method does not have a lengthy preparation process. In the two step method, initially nano–scale sized metals, metal oxides, fiber particles and carbon nanotubes (CNT/NCT) are prepared. The dry powder is produced by various processes like chemical vapor condensation, mechanical alloying, etc. Thereafter, it is dispersed in the base fluids. The agglomeration is high in this method, because of its prolonged stages in the

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