Side Holes

Your question makes no sense.

Does it have anything to do with Y connectors?

Is this homework?

It has nothing to do with Y connector ;its separate question ;and its research not home work

Research??

Well, to answer the question, I'd say that in every situation holes in a pipe would increase the flow.

Your question still makes no sense.

What kind of research?

Developing vascular access device for failing dialysis fistula; it's vascular surgery; sorry I'm not very familiar with fluid dynamic; but there are very controversial opinions on this topic.

http://www.ncbi.nlm.nih.gov/pubmed/16441829

"No significant difference was recorded in mean blood flow rates between the catheters"

http://www.ishd.net/hhi/v6/HHI-Vol6-pg40-46.pdf

"On the other hand, side holes in permanent catheters or venous limbs seem to be superfluous for performance reason"

I can see possible reason for this controversy that these studies involved catheters.

Inside counterflow of blood; can it be an explanation from engineering point of view?

thnx

You're looking at in-flow, not out-flow. This is different. Now it becomes a question of the effect of hydraulic pressure differential. If the end of the tube is not restricted, I'd say side holes won't increase the flow that much.

But, many variables come into play.

If the catheter fits closely into the passageway where it is inserted, any side holes will be (nearly) blocked, and thus may contribute little to additional inlet flow. OTOH, if the end is blocked, the passageway may become inflated, giving clearance for more flow. These and many other variables make any single answer unlikely.

In my situation passageway diameter would be large enough to prevent blocking of side holes..didnt uderstand your idea about inflating ..can you pls explain ?

thnx

What else haven't you told us? Is this going to devolve into 20 questions?

Additional holes will not increase flow...the only way to increase flow is to increase the diameter of the catheter, or to shorten the length thereby lowering resistance....In this case the additional holes would seem to be superfluous...I would think pharmaceutical management of blood viscosity is much more important...just my opinion...

I need to increase flow rate as much as possible .If i d copmare three tubes one with side holes an end hole,second with side holes only and third with end hole only

which one would increase flow more if i d apply more pressure ?

does it matter if its inflow or outflow?

is direction of flow in a passageway count ?its same direction for outflow tube

and opposite direction for inflow tube..but at this point i can reverse inflow and outflow lines

thx

Too many variables remain unknown. You'll have to do the work to get the answer.

You should not be asking strangers for this type of advice.

ok thank you .last question :what additional variables should i look for to answer this question ?

thx

It depends on the length....if the holes are in one tube that is the same length as another without holes, then the one with the holes would be effectively shortened....If you cut the tube of the one without holes at a length where the holes begin in the other, then that would be effectively shorter...Whether inflow or out, the effect will be the same...If I were designing prototypes, I would concentrate more on obtaining a smooth finish to discourage embolism formation...or possibly a coating of some sort..In any case there is no information or studies indicating catheters with holes are superior, that I've seen...

Holes in the sides will effectively shorten the pipe (thereby reducing resistance) and increase flow under static pressure, versus a pipe with no holes. Of course, blocked holes act like no holes.

SITUATION: When the outlet of pipe is closed and you continue pumping, in this situation you make a hole in the pipe that would increase the flow rate. How is that?

Research - Google:

Venturi effect

http://en.wikipedia.org/wiki/Venturi_effect