Cohesive air blower alternatives

[Breadfan]

I'm sure we all remember Hoots wonderful article on cohesive air.

While at work yesterday, we have some leaf blowers (electric) that we use to create air cirulation in ducting to take air samples. Well, being the IT guy, when they broke one of them, I was asked to fix it...hey it was electonic

I've never looked close at an electric blower (although I've fixed a number of gas ones). Its a very simple design...the motor, with a turbine attached directly to it. above the turbine is a circular grate for the air intake. The turbine spins, sucking in air and blowing it straight out the tube...much like the cohesive air blower.

As you know, they put out alot of airflow too...gotta blow leaf piles with the thing, so it better.

I was thinking, these could be an alternative to the blower Hoot used...they're very easy to find. Home Depot had a Toro 140mph electric blower for $32 too. The casing is mostly plastic, so its easy to cut, paint, or mod to fit your case, maybe build a bracket for it.

I may give it a shot someday, although i'm already collecting things for watercooling, so I'll probably skip over this idea.

Hoot if you read this, feel free to input!
Mike

 

[Hoot]

I have one I got from Sears. I'm pretty tough, but if I use it, outside, to blow leaves and I don't wear hearing protection, I get nauseous from the sound pressure level. It's also physically, pretty big. There is a point of diminishing returns for increased airflow. I have seen that in my own experiments. Every HSF has a point where no matter how much additional ambient air you force through the fins/pins, it simply can not conduct the heat any faster for the size of the contact area with the core. Keep in mind that the 2C646 and 2C647 blowers cost as much a a pair of Panaflo 120mm fans and a pair of 80mm fans, all of which you wouldn't need with the one blower solution.

Hoot

 

[Breadfan]

Heheh, wow, I guess 140mph air speed is quite a lot isn't it. I've never used an electric one outside, so no idea what they are like.

I also didn't reailze those blowers were so cheap, I liked the idea, but since I'm giong water instead, didn't really look into them.

The big remaining question is this: Is there much of a difference/benefit between the turbine (which looks like the impeller in a turbo) on the leaf blower or the fan design on the blower from your article? Is the air flow out of them similar, or does the trubine create more disturbances in the air flow?

Mike

 

[Froggy1]

Breadfan (Jul 13, 2001 12:42 p.m.):
Heheh, wow, I guess 140mph air speed is quite a lot isn't it. I've never used an electric one outside, so no idea what they are like.

I also didn't reailze those blowers were so cheap, I liked the idea, but since I'm giong water instead, didn't really look into them.

The big remaining question is this: Is there much of a difference/benefit between the turbine (which looks like the impeller in a turbo) on the leaf blower or the fan design on the blower from your article? Is the air flow out of them similar, or does the trubine create more disturbances in the air flow?

Mike

The blower your playing with Bread is designed for pressure, whereas the one hoot is using is designed for flow. So using a leaf blower would be a big mis-application of air moving technology.

 

[sfa ok]

Also, I doubt that the leaf blower motor would be built to last as long as the blower Hoot used.