Dear Scholars,
As a part of my research, I am interested to measure the mass evolution (mass lost) of a evaporating fuel droplet during its combustion/evaporation. In our experiment, a fuel droplet with an initial diameter of 1mm and initial mass of 0.5 milligrams is usually suspended on a fine fiber (15 micron, Silicon Carbide) or thermocouple (25 micron) and the droplet is exposed to high temperature non-reactive environment (provided by McKenna burner) to evaporate. The following figure, illustrates the general idea of fuel droplet mass measurement during experiment.
As I mentioned, I am interested to know the fuel droplet mass evolution while it is evaporating. Regarding that, I would appreciate if you could tell me about any possible solution?
Any chance of trying high speed imagining? A past group member I recall used high speed imaging to look into flocculation for cellulosic fines retention; cellulosic pulp fines are fibers that are capable of passing a 200 mesh screen. So those are short fibers being imaged. To watch the droplet evolution may help. That way you get changes in volume fraction that can be used to get changes in the mass.
Dear John Reye ,
Thanks for sharing your idea.
Regarding your opinion on employing a high speed camera to capture the fuel droplet projected area and relating the area to mass, unfortunately for the case that we are working, it is not an efficient approach. The special type of fuel that we are interested to investigate on it, is Heavy Fuel Oil. The evaporation behavior of such fuel is completely different with typical fuel. Because the fuel droplet surface regression has kind of oscillating behavior (puffing) due to nucleation of more volatile fractions inside it, it is not a valid approach to correlate the mass of droplet to its volume (radii). Therefore, the mass variations (lost) should be measured directly.
Hi,
Well you will not see it but something as simple as TGA can show you the weight change as temperature ramps up. You will have the weight time and temp trend; even isothermal profiles... That way you get the more volatile components gone first and see all the changes. Just a thought... You either have the sample in a boat or can set the TGA up with your fiber attached with the droplet hanging.... some version of...
Dear John Reye ,
We are tying to study the fuel droplet combustion/evaporation in an elevated temperature environment (around 1600 K) and considering the fuel droplet keeps its spherical shape (due to spray effect). TG has two main inadequacies 1) the fuel sample has to be placed in a tiny pot which causes for the fuel droplet to not having spherical shape 2) there is limitation with operation temperature range which for most of commercial models is up to 1200 K.
Versatile box furnace (STV‐1600C 181818, 1600 °C, inner chamber 18”x18”x18, various heating cycles, atmosphere control) takes you to 1873K, and you don't need to use a boat/pot for samples. Samples normally are hung and so a fiber with the sample could be hung as well thus "modified" from any pot configuration. I understand that normally there is a "pot" but that is not the only way to do it. Regardless, last thought on this. Good luck.
- Badges
- Science topic