Next Lecture
Wednesday, February 3, 2016, 10:00
FLUIDIC OSCILLATORS FOR ALGAE CULTIVATION
- and their role in geopolitic stability
Institute of Thermomechanics of the CAS, v. v. i.
Lecture outline:
Our civilisation is extremely dependent on cheap liquid fuel used for transportation. Until roughly the end of 19th century people used to work in their respective dwelling places. Now they commute in huge numbers every day. Food and other goods travels hundreds (if not thousands) of kilometres between production and use. This model is increasingly adopted by developing most populated countries (China, India). Fossil fuel sources, on which this all depends, is produced – at an increasingly high cost – in politically unstable regions. No wonder research grant providers are willing to support financially the research promising renewable petrol as its result. The starting point are algae – primitive, often unicellular plants capable to produce by photosynthesis - from H in water and CO2 taken from air - hydrocarbon compounds, processing of which into biofuels brings no difficulty in principle – after all, the fossil oil was produced the same way from algae millions of years ago. Additional benefit would be the whole process being carbon neutral so that removal of CO2 from the atmosphere would suppress the global warming. Algae may be also a starting point of a food chain, solving another global problem.
The difficulty is so far the price of the crude oil from algae being higher than the fossil one. The key factor for success is making more efficient every step in the process. One of perhaps small but nevertheless important contribution towards the goal is more efficient diffusion transport of CO2 into the algae in bioreactors. Suggested solution is generation of sub-millimetre sized microbubbles by placing a fluidic oscillator into the gas inlet. The research grant project investigated in the Institute of Thermomechnaics enabled recently testing a number of alternative oscillator designs.
