Centrigugal Blower
Centrigugal Blower
(OP)
Hi friends,
I am posting this question about centrifugal blower because there is good similarity between a centrifugal pump and a centrifugal blower.
I want to select a blower for a gas which is about 36 times heavier than air at 1 atm. pr. The voulmatric flow rate for this gas is about 55 cfm and pr. drop in pipe line for this flow rate is about 18".
The problem is I don't know how the volumatic flow rate of a centrifugal blower changes with gas or fluid density.
Any suggestions??
I am posting this question about centrifugal blower because there is good similarity between a centrifugal pump and a centrifugal blower.
I want to select a blower for a gas which is about 36 times heavier than air at 1 atm. pr. The voulmatric flow rate for this gas is about 55 cfm and pr. drop in pipe line for this flow rate is about 18".
The problem is I don't know how the volumatic flow rate of a centrifugal blower changes with gas or fluid density.
Any suggestions??
"Knowledge is power"





RE: Centrigugal Blower
Flow rate is very low, and peripheral type fan or maybe a PD roots type blower would be the most likely sort of devices i would guess
RE: Centrigugal Blower
there is an excellent similarity between blowers and pumps.
For your purposes compressibility is not an issue.
A pump is a constant volume device; at a given speed it will deliver a given volume at a given head (in of fluid pumped)regardless of density. There are some minor issues about viscosity and the like but the effects are normally minor. If you have a pump at a given speed that delivers X m^3/s at a head of Y metres of water, then it will deliver approximately X m^3/s of gas at a head of Y metres of gas.
Alfred Buchi, the inventor of the turbocharger, used a cast iron water pump for his exhaust turbine, so you are in good company.
Now for the bad news; as tonyh implies, finding a suitably sized pump with suitable speed rating may take some doing.
A slow speed rootes or screw is probably easier to arrange.
Good luck
Cheers
Steve
RE: Centrigugal Blower
Since Power =
density of gas* vol. flow rate* head( of the process gas)
= rho*Q*H
If i express the head in terms of water column, density is automatically taken care.
Kindly comment.
"Knowledge is power"
RE: Centrigugal Blower