Pro/Forums - View Single Post - My micro-channel concept block

GeminiCool · 10-14-2002, 07:42 AM

Cathar -

This 12hr time change is a killer.

Reading my post this morning, I agree it is very unclear, and I see where you have been mislead. The Velocity through both fittings in a closed loop system is the same, ok sorry didn't mean to imply that it would be different.

I'm a visual person, so let me try to draw a picture in words (please be patient).

1" hose -> 1/4" fitting. --> some overall flow rate drop (FRD)
1" hose -> 1/4" tube --> the fitting is stretched so now it is more than one spot but rather a 6" long stretch or something. The FRD should be "about" the same.
1" hose -> 1/4" opening -> bulge the middle of the tube -> 1/4" opening.

Ok when the last scenario is entered, the FRD over the "system" should still be "about" the same, no?

Taking this thinking further, across the 1st reduction, if it was the only in the system you'd have the full FRD. Now the 2nd reduction is added. The flow rate will not change as significantly as when the 1st was added. So, in order for there to be equal drops across each reduction, the drop seen across the 1st reducer must be LESS than it was originally. Hence, I'm asking/stating that there is an apparent reduction in the first fittings resistance, as the second fitting is added, which seems to be logical if flow is not significantly altered.

I guess my ultimate question here, is what are the real numbers. I'm not saying the resistances don't add. I'm asking, when they add, is the second restriction significant given the apparent reduction in resistance of the 1st fitting? The question that remains unanswered is, HOW MUCH? Furthermore, if this holds true, was the absolute bashing another forum goer received from some members warranted?

I believe in 'partial credit'. You can be 'basically right' in life but you can't be 'basically right' when stating annoying in these forums. I've taken from this that I am pretty thin skinned and take to heart what is said. I think it is personal slander when a respected member lamb bastes anyone for a statement that is 'basically right'.

10-14-2002, 07:42 AM	#128
GeminiCool Cooling Neophyte Join Date: Mar 2002 Posts: 20	Cathar - This 12hr time change is a killer. Reading my post this morning, I agree it is very unclear, and I see where you have been mislead. The Velocity through both fittings in a closed loop system is the same, ok sorry didn't mean to imply that it would be different. I'm a visual person, so let me try to draw a picture in words (please be patient). 1" hose -> 1/4" fitting. --> some overall flow rate drop (FRD) 1" hose -> 1/4" tube --> the fitting is stretched so now it is more than one spot but rather a 6" long stretch or something. The FRD should be "about" the same. 1" hose -> 1/4" opening -> bulge the middle of the tube -> 1/4" opening. Ok when the last scenario is entered, the FRD over the "system" should still be "about" the same, no? Taking this thinking further, across the 1st reduction, if it was the only in the system you'd have the full FRD. Now the 2nd reduction is added. The flow rate will not change as significantly as when the 1st was added. So, in order for there to be equal drops across each reduction, the drop seen across the 1st reducer must be LESS than it was originally. Hence, I'm asking/stating that there is an apparent reduction in the first fittings resistance, as the second fitting is added, which seems to be logical if flow is not significantly altered. I guess my ultimate question here, is what are the real numbers. I'm not saying the resistances don't add. I'm asking, when they add, is the second restriction significant given the apparent reduction in resistance of the 1st fitting? The question that remains unanswered is, HOW MUCH? Furthermore, if this holds true, was the absolute bashing another forum goer received from some members warranted? I believe in 'partial credit'. You can be 'basically right' in life but you can't be 'basically right' when stating annoying in these forums. I've taken from this that I am pretty thin skinned and take to heart what is said. I think it is personal slander when a respected member lamb bastes anyone for a statement that is 'basically right'.