- Jan 23, 2005
ceg4048;31253 said:Can we assume that boundary layer thickening due to non-laminar flow also affects the other nutrient transfer across the layer as well? If so can you confirm that higher CO2 injection rates and higher dosing levels can mitigate these effects?
Is there any general tell-tale signs from leaf morphology that indicates whether the plant is a HCO3 user or strict CO2 feeder? I've never seen a list which segregates according to this type, although Vallis seems to be known as an HCO3 feeder.
Could there also be a correlation between the "difficulty" of plants and their ability (or lack thereof) to utilize HCO3?
Would appreciate any thoughts.
Tom Barr;31254 said:If we add CO2, this is not an issue.
If we use CO2 mist, then neither is an issue, the mist disrupts this boundary layer quite well I'd imagine.
You should realize something though..............why do all this to get CO2, unless it is limiting growth in the first place?
It's neat etc, but does not apply to us unless we are limiting CO2.
Since we are not trying to do that, no one this is done
ceg4048;31259 said:Also, although intuitive, it's not exactly obvious by what mechanism unlimited N helps in this. N doesn't appear in the CA equation nor in the Rubisco equation. Is is simply due to high chloroplast production in general or is there a more specific role in N's ability to garner higher intracellular CO2 concentrations?
VaughnH;31264 said:This is possibly nit picking, but in aerodynamics higher Reynolds Numbers give thinner boundary layers, not thicker. And laminar flow gives the thickest boundary layers. I'm not sure if liquid flow acts that way, but I know supersonic gas flow, which is incompressible flow, does, having spent several years working with aerodynamics and gas flow.
Thank you. That makes sense now. In aerodynamics you described separated flow more so than turbulent flow, but when I was working in that field we did nothing at all with the transition flow, and very little with laminar flow, for that matter.ceg4048;31272 said:Within the laminar flow regime, increasing Reynolds number reduces the effective boundary layer thickness. As long as there is no flow separation the flow follows the contours of the surface. The author of that article indicates that when the flow transitions from laminar to turbulent flow the effective boundary layer thickness increases in comparison to what it was before the transition. Thickness increases as it fails to follow all contours (in effect skips across) and then starts to decrease as the Reynolds number increases. It is the transition region of flow that the article discusses. The other issue is that the thickness increases as the distance along the path increases.