The fill the tube with sand method can work. At least it works on hydraulic tubing that is also heated with a torch. The question of annealing has come up, if the material works hardens you may find yourself having to anneal more than once.
Im sitting here trying to understand this cooling ring. Im assuming the jets would point to the center and that this would require a predrilled tube. If so it might be a problem to keep what ever you fill the tube with in the tube.
By the way whenever possible make a proper form to bend the tubing around. Even better consider making a a bending machine that keeps the stress constant on the material as it wraps the die. A proper tool will keep an even draw on the tube reducing the possibility of cracks.
Some if the handheld tube benders out there will allow you to get close to 360 degrees if you release and get a second grip on the tube. Close might be 300 degrees but it is better than nothing.
Somebody mentioned air flow above and the starvation of ports farthest from the source. This can be a real problem so the tube size and the port sizes must be chosen carefully. This makes me wonder how much space you have because an alternative here is commercial spray nozzles which come in different widths and patterns.
Another option would be a single port with a baffle that forces the air stream to circle around the tip. Sort of like a squirrel cage fan in reverse.
Im sitting here trying to understand this cooling ring. Im assuming the jets would point to the center and that this would require a predrilled tube. If so it might be a problem to keep what ever you fill the tube with in the tube.
By the way whenever possible make a proper form to bend the tubing around. Even better consider making a a bending machine that keeps the stress constant on the material as it wraps the die. A proper tool will keep an even draw on the tube reducing the possibility of cracks.
Some if the handheld tube benders out there will allow you to get close to 360 degrees if you release and get a second grip on the tube. Close might be 300 degrees but it is better than nothing.
Somebody mentioned air flow above and the starvation of ports farthest from the source. This can be a real problem so the tube size and the port sizes must be chosen carefully. This makes me wonder how much space you have because an alternative here is commercial spray nozzles which come in different widths and patterns.
Another option would be a single port with a baffle that forces the air stream to circle around the tip. Sort of like a squirrel cage fan in reverse.
