Analysis of heat transfer coefficient in silica nanofluids with water as base fluid under transitional flow


Autoria(s): Joneidi Jafari, Aliakbar
Data(s)

26/05/2016

26/05/2016

2016

Resumo

The effect of Reynolds number variation in a vertical double pipe counterflow heat exchanger due to the changes in viscosity can cause the change in flow regime, for instance, when heats up and cools down, it can convert from turbulent to laminar or inversely, that can have significant effect on heat transfer coefficient and pressure drop. Mainly, the range of transition phase has been studied in this study with the investigation of silica nanofluid dispersed in water in three different concentrations. The results have been compared with distilled water sample and showed a remarkable raise in heat transfer coefficient while pressure drop has been increased respectively, as well. Although pumping power has to go up at the same time and it is a drawback, heat transfer efficiency grows for diluted samples. On the other hand, for the most concentrated sample, effect of pressure drop dominates which leads to decline in the overall efficiency.

Identificador

http://www.doria.fi/handle/10024/123692

URN:NBN:fi-fe2016052612796

Idioma(s)

en

Palavras-Chave #nanofluid #heat transfer coefficient #silicon dioxide #transitional flow #pressure drop
Tipo

Master's thesis

Diplomityö