Fabrication and performance improvement of heat exchanger using wire coil inserts with hybrid nano particles

摘要

In the last decade, a number of investigations have been conducted to identify the possible mechanisms that contribute to the enhanced effective thermal conductivity of nano particle suspensions [Nano fluids]. The thermal performance of heat exchangers depends on a variety of factors including geometric, kinetic and spatial aspects related to the net heat transfer rate encountered between the heat transfer sections and flow of fluids. A laminar flow convective heat transfer of Al_2O_3 - Cu + Water nanofluids flowing through a horizontal tube heat exchanger pipes with and without coil inserts were experimented. For this purpose, Al_2O_3 - Cu nano particles were synthesized, characterized and dispersed in distilled water to form stable suspension containing 0.1% volume concentration of nanoparticles. Two wire coil inserts were made of Cu was introduced in the heat exchanger tubes to increase the heat transfer performance of nano fluid flowing in it. The performance of nano fluid in heat exchanger with and without wire coil inserts were calculated and reported.