I learned at at young age from a physics kit that one can blow up a large bag with your mouth by blowing into it from a distance and letting the air pick more air with it. Later in life when Dyson launched its fan, I understood the principle well. If I remember correctly Prusa also does something similar to help more air pass the heatsink of the hotend.
I am now looking to design a fan shroud/holder that will be used to move hot air out from the box. The box has vents at the front and rear but the hot air is practically still in the box and the content within is slowly overheating. The idea is to use a couple of PC fans in the rear to move air out of the container and let fresh air be pulled in through the front of the box. I need to design the part that make it possible to mount the fans to the rear vent of the box.
I therefore want to make use of this physical effect to increase the airflow. The idea is to keep the rpm, sound and power consumption down by making use of this effect. I have been searching for days now but I am kind of stuck. My questions are:
- What is this effect called?
- How do I maximize the airflow using this design? Are there any guidelines to follow?
- Do you know of any drawings or similar that make use of this physical property?
- How much extra air can be pulled by the extra drag created by the fan? What is the limit of this effect?
Basically I want to learn more about this and make the most out of this physical property. I need some guidance so I can conduct some more research, but if you happen to know of any drawings/designs/product that make use of this that I can take inspiration from, then that would save a lot of time.