XPost: sci.physics, sci.space.policy
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"Sergio" wrote in message news:pl700g$16u7$
1@gioia.aioe.org...
On 8/17/2018 11:57 AM, Robert Clark wrote:
Follow up to this post:
Pumping pressurized fluids to high altitude for the space tower and for fighting forest fires. https://exoscientist.blogspot.com/2018/08/pumping-pressurized-fluids-to-high.html
In that post, I had thought we would need a secondary pump, such as a
ram pump, to convert from high volume, low head to low volume, high
head, because I didn't think there existed pumps high in both.
But in fact there are existing high volume, high pressure pumps that can
be used singly to send water streams kilometer distances to fight forest fires and deliver water to drought stricken areas:
Pumping pressurized fluids to high altitude for the space tower and for fighting forest fires, Page 2: high volume, high head, single pump
solution. http://exoscientist.blogspot.com/2018/08/pumping-pressurized-fluids-to-high_17.html
Moreover, it might be possible to send the flow kilometers distance
without a pipe through the phenomenon of laminar flow. Laminar flow is
an interesting phenomenon in its own right. Some examples of it are
shown in the videos in the blog post.
Bob Clark
water from 4,000 feet up will evaporate, and turn into a light water
vapor mist at ground level.
also what is the flow resistance of a 4,000 foot vertical pipe ?
note your flow rate at 380 gpm is no good for firefighting at all.
380/60 = 6 gallons per second. =====================================================================
Even a rain if it lasted for hours could extinguish a forest fire.
The expected loss in pressure for long distances is given by the calculator
at the link for the Hazen-Williams equation.
The 380 gallons per minute is actually in the high range for the largest handheld hoses used by fire fighters in the 5" diameter range. But in any
case you would use multiple water streams like any large fire.
Take a look at the laminar flow videos in the post. The cohesiveness of
the flow is quite surprising. The length of the laminar flow streams will be longer than the usual streams. The question is how much longer? I don't
think anyone knows the answer to that.
Bob Clark
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Carbon nanotubes can revolutionize 21st-century technology IF they can be
made arbitrarily long while maintaining their strength.
Some proposals to accomplish that here:
From Nanoscale to Macroscale: Applications of Nanotechnology to Production
of Bulk Ultra-Strong Materials.
American Journal of Nanomaterials.
Vol. 4, No. 2, 2016, pp 39-43. doi: 10.12691/ajn-4-2-2 | Research Article.
http://pubs.sciepub.com/ajn/4/2/2/ ----------------------------------------------------------------------------------------------------------------------------------
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