Thanks for the large number of responses. I would have replied sooner but apparently e-mail notification was not on.
First, to clarify my question:
The only two pieces of information I am given is the resulting volume-mean dimater of a sample of liquid droplets, D30, and the total number of...
Here is the summation I am looking for an identity for:
[Σ](nidi^3/N)
I can bring out the N since that is a constant. The ^3 can go away by a variable substituion so I am essentially left with:
[Σ]XiYi
My question is can I break part that summation so I end up with Xi and Yi in...
I was given another recommendation of a simple test to determine if there will be sufficient liquid supplied to the pump inlet that seems to work if the NPSHA or NPSHR are not easily obtainable.
I set up the system exactly as designed except that the pump was not connected. I simply opened the...
Thank you for the replies. I double checked and the cap for the tank is vented so the air should be entering at the same rate the liquid is evacuating, especially at these low flow rates.
I am attempting to calculate the NPSHA for a centrifugal pump in a system I am designing. I have checked over my calculations and come up with a number that looks to be technically correct but does not seem intuitively correct. I want to get a second opinion to see if I did something wrong...
I like that idea and it is definitely a more simple idea. I will pursue that line also. Down the road, there may still be a need to heat the nozzle for other applications so I will look into the feasability of doing it but for this application, an air purge seems to be a good bet.
Using an equivalent thermal circuit, I was able to calculate the thermal resitances across the different boundaries, i.e. the wall of the titanium feed tube, the convection and radiation from the OD of the feed tube, wall of the stainless steel shroud, and convection and radiation from the OD of...
I haven't determined an appropriate method of temperature control yet. At this point it seems like it will be a challenge to just design a method for installing the heating element. A thermocouple could work but I would then also need a way to insert that through the fitting at the entrance to...
I have tried a couple different ideas of how to approach this problem and would like some advice as to a method to use.
The Problem:
The pipe in question is a liquid feed tube for a spray nozzle. The feed tube has an ID of 0.067 inches, an OD of 0.125 inches, and is made of Titanium. The...
I am trying to characterize the expansion of air as it leaves a nozzle into the ambient environment. Let's assume a round cross section. I know that the air flow will initially have a cross section resembling the nozzle outlet with a slighty smaller diameter equivalent to the vena contracta...
Yes, testing and using that data to come up with my own curves or functions seems to be the easiest way to arrive at a somewhat accurate prediction tool.
The value of 0.6 W/sq.ft. equates to 1 degree C rise would have been something you have developed from testing that particular set-up, right?
If I knew what the power dissipation from the circuitry was and the dimensions of the box, could I estimate what the temperature differential would be between inside the box and outside assuming it has been generating heat over a long time, i.e. steady state. The link I gave does this but I am...
I am looking to find a way to estimate what the temperature would be in an electronics box without getting into the complicated heat transfer equations. Hoffman provides a simplistic method here: http://www.oksolar.com/pdf/components/enclosures_heat_dissipation-ChAp36_37.pdf
This seems to apply...
