how to get water to drip at a constant rate

id like to get water to drip at a very constant rate. right now, i
have a small 12dv 300ma pump pumping water straight up through a small
flexible plasic tube, which is arched 180 degrees at the top to form
something akin to a tiny faucet.

however, i cant seem to get it to drip at a constant rate. the problem
is this:

if i pump too much water, the water forms a stream at the end of the
tube, then about an inch down the stream the water falls apart into
tiny drops (the point at which the stream breaks off into drops varies
sporadically and thus does not provide constant drippage).

as i lower the flow rate of the pump, the stream will shorten until at
a certain point the drops start falling from the end of the tube.
however, they still do not fall constantly. the drops will vary from
falling from just at the end of the tube, to about one drop in length
below the tube. i cannot seem to get rid of this unwanted phenominom.

the tube is not visibly vibrating or being weighed down by the drops
falling, so that's not a problem.

possible the water pump just cant a constant enough flowrate?

so, i ask, how can i get a very constant drippage of water? the more
drops per second, the better, just as long as they drip at a constant
rate!

thanks for your help,
-sam

.

Relevant Pages

  • Re: Contact patch size versus tire inflation
    ... First I rummaged around for a pump that I didn't care about. ... My first attempt to suck up a pump-full of water failed miserably, ... or maybe some porous valve material held a lot of air. ... the inner tube. ...
    (rec.bicycles.tech)
  • Re: rotary pump question
    ... get a good volume of water through the group. ... & the horseshoe shaped tube that continues the loop to the ... fill tube (one tube to HX, one to boiler, & one tube to a OPV). ... I test them using a bottle of water & let the pump pull ...
    (alt.coffee)
  • Re: Ask EU - Thermosiphons
    ... To avoid the cost of sensors and other electrical gubbins, I am thinking of using a thermosiphon where the solar collector tube will be coiled and mounted lower than the pool and water will circulate due to expansion/convection of the warmed water. ... It depends on the power of your pump but have you considered running a pump directly from some solar PV panels? ...
    (uk.media.radio.archers)
  • Re: Ask EU - Thermosiphons
    ... To avoid the cost of sensors and other electrical gubbins, I am thinking of using a thermosiphon where the solar collector tube will be coiled and mounted lower than the pool and water will circulate due to expansion/convection of the warmed water. ... It depends on the power of your pump but have you considered running a pump directly from some solar PV panels? ...
    (uk.media.radio.archers)
  • Re: Ask EU - Thermosiphons
    ... This seems to be helping but it's expensive to keep the pump running ... thinking of using a thermosiphon where the solar collector tube will be ... expansion/convection of the warmed water. ... Stirling engine is a device for converting heat from "low-grade" (i.e. ...
    (uk.media.radio.archers)