Investigation of а stress-strained state of a screw-shape tubes of heat exchangers

Based on the results of the study of the parameters of the air flow inside of the brass screw-shape tube of the heat exchanger, the determination of their optimal geometric characteristics and further modeling of the stress-strain state was performed. Verification of simulation results is carried out on the basis of comparison with the test task.

III An account of an experiment touching the different densities of the air, from the greatest natural heat, to the greatest natural cold in this climate

I Took a Glass Tube about 2 Feet in Length, and near two tenths Diameter; which at about 6 Inches from one end, I bent in form of a Syphon, as represented by the Figure: at whole end, which was farthest distant from the Angle, I cemented on a Brass Screw with small Perforation in it; by which means, when I put a little Quicksilver into the shorter Leg, I could by declining the Tube, or longest Leg, bring it to rest any where; as suppose at A A.