Avaliação experimental do aumento da transferência de calor e de propriedades térmicas em trocadores de calor utilizando nanofluidos
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Date
Advisor
Bimbato, Alex Mendonça 
Coadvisor
Zevallos, Andrés Armando Mendiburu
Huallpachoque, Roberto Carlos Chucuya
Graduate program
Engenharia - FEG
Undergraduate course
Journal Title
Journal ISSN
Volume Title
Publisher
Universidade Estadual Paulista (Unesp)
Type
Master's thesis
Access right
Acesso aberto
Abstract
Heat exchangers are devices used to transfer thermal energy between fluids. Their application covers various industrial sectors, including heating, cooling and condensation, the latter being especially important in energy systems. This work aims to evaluate heat transfer in a shell-andtube heat exchanger operating with steam as the hot fluid and water as the cold fluid, which was then replaced by Al2O3 nanofluid. The results show that the heat transfer rate did not change
significantly with the use of the nanofluid. However, it can be seen that the nanofluid plays a considerable role in increasing the convective coefficient and the overall average heat transfer coefficients. The thermal conductivity and concentration of the nanoparticles prove to be influential in this phenomenon. It is noteworthy that the most significant increases in the convective heat transfer coefficient are recorded when the steam flow rate is 0.01898 kg/s, showing an increase of 35.9%. In addition, there is also a 34.4% increase when the steam flow rate is increased to 0.02142 kg/s, a 33.1% increase at 0.02262 kg/s and a 32.7% increase when the flow rate reaches 0.02416 kg/s. For the same steam flow rates, the overall average heat transfer coefficients experience notable increases of 31.7%, 30.5%, 29.2% and 28.6%, respectively. It should be noted that the ideal concentration of nanoparticles was determined to
be 1.25%, since this concentration provides the highest percentage increases in the variables that influence the heat exchanger's operating parameters.
Description
Keywords
Trocador de calor do tipo casco e tubos, Transferência de calor, Condensação, Nanofluidos, Nanopartículas de Al2O3, Shell and tube heat exchanger, Heat transfer, Condensation, Nanofluids, Al2O3 nanoparticles, Permutadores térmicos, Calor - Transmissão, Nanofluídos
Language
Portuguese
Citation
SALDAÑA BERNUY, Luis Fernando Junior. Avaliação experimental do aumento da transferência de calor e de propriedades térmicas em trocadores de calor utilizando nanofluidos. 91f. 2023. Dissertação (Mestrado em Engenharia ) - Faculdade de Engenharia e Ciências, Universidade Estadual Paulista, Guaratinguetá, 2023.
