Hi - having come up blank when searching, I figured I'd ask here: do you know of any (free, preferably open source) planetary accretion models/simulators available for download? I'm primarily looking for solar system formation / evolution rather than planetary geochemistry (although I'd have an...
The question is not about efficiency, but maximum useful PPFD. I'm (as mentioned) trying to gather saturation levels (for the design of cultivation environments). The paper reports saturation at levels a small fraction of full sunlight (a few hundred umol/m²/s, versus full sun of around 2200...
Hi - I'm working to accumulate data on photosynthetic flux saturation levels across a range of plant species, and am having a bit of trouble understanding this paper:
https://onlinelibrary.wiley.com/doi/epdf/10.3732/ajb.94.8.1344
Table 5 shows PPFD vs. ETR, and shows photosynthesis saturating...
I was actually thinking about starting a thread on this myself.
CWatters: To follow up on your original post: the basic argument by the critics is that if you're taking lithium (or sodium) on one side, and transferring it to the other side, then you're not doing any work; you've just moved it...
Thank you for the derivation - that was very thorough. I can't imagine how long it would have taken me to come into something like that on my own.
Re α: Aha, that was the bug - I was just using total surface area, not surface area per unit volume. Now all of the numbers make sense...
Hmm, this is strange. I'm working with the numbers in the spreadsheet, and concerning tau:
$$\tau=\frac{3f\left[\frac{1}{5D_L}+\frac{1}{D_GH}\right]}{\alpha^2\left[\frac{1}{f}+\frac{1}{(1-f)H}\right]}\tag{17}$$
If we break that down:
$$3f$$
... is 3 times a small number, a fraction of a...
If we assume that it's equal to precisely 0, then the equations become very short :)
$$C_L(t) = \frac{\frac{f}{1-f}C_{L0}+C_{G0}}{\frac{f}{1-f} + H}\tag{20-eq}$$
$$C_{L0} = \frac{C_{GO}X}{\frac{f}{1-f}(1-X) + H}\tag{22-eq}$$
"was supposed to"? As mentioned, this isn't a homework problem; I'm not a student. :)
There's a wide variety of species (with varying diffusion constants and Henry's law constants), they're not all equally important to absorb. The bulk of the stream is CO2, with a few percent nitrogen...
Hmm, you're right - I did integrate incorrectly (only with respect to time). I'll start instead with your equations 16-17:
$$C_G/H-C_L=(C_{G0}/H-C_{L0})\exp{(-t/\tau)}\tag{16}$$where...
I can't say that they don't, but it's important to have as low of a liquid flow rate as possible, in order to minimize the required amount of ionic liquid.
By the way, how do you post math here? I put Eq. 7 in terms of C_G:
C_G = (f*C_F0 + (1-f)*C_G0 - f*C_L) / (1-f)
I integrate both sides...
Hmm, isn't that what I wrote? "equilibrium concentration of the species in the liquid phase" = "concentration that would exist in the liquid if the liquid were in equilibrium with the local species concentration", right? And "the rate of change ... per unit time that the flow progresses...
Indeed you did - I just happened not to see the definition of R during my first readthrough of the equation because it wasn't boldfaced like the other variables, and after pondering for a whole why the gas constant would be relevant, I went back and re-read what you wrote and saw it. :)
I've...
Sorry for taking a while to respond, I've been trying to make sure I understand each line.
(1 & 2) I was initially confused about the changing volume (since droplet sizes are fixed), until I realized that you're representing the whole unit as if it's growing over time. Which is interesting, I...