ISSN Online: 2377-424X
ISBN Print: 978-1-56700-474-8
ISBN Online: 978-1-56700-473-1
International Heat Transfer Conference 16
EFFECT OF RHEOLOGICAL PROPERTIES ON CONVECTIVE HEAT TRANSFER OF MICROALGAE SLURRY IN LAMINAR FLOW
Sinopsis
Hydrothermal hydrolysis is a cost-effective method to pretreat microalgae biomass for further biogas production via fermentation. In continuous hydrothermal hydrolysis reactors, the heat transfer characteristics are not clear due to the complex rheological properties of microalgae slurries. Herein, we numerically investigated the heat transfer characteristics of microalgae slurry (chlorella pyrenoidosa) in tube with homogeneous heat flux in a laminar flow. The Reynolds numbers (Re) were set as from 450 to 1800, and the heat transfer performance of microalgae slurry with different inlet temperatures were studied. The results showed that the property of variable generalized rheology index of microalgae slurry led to a lower heat transfer performance with the increase of Re number. In addition, the variable viscosity of microalgae slurry can enhance or weaken heat transfer performance depending on the viscosity-temperature relationship of microalgae slurry. Finally, the effects of variable rheology index of microalgae slurries on Nusselt number (Nu) were summarized in heat transfer correlation.
PALABRAS CLAVE:
Renewable energy, Convection, Microalgae slurry, Rheological properties, Heat transfer performance