Principle and characteristics of T-fin tube
1, the principle of T finned tube
T-finned tube is formed after the rolling process is one kind of efficient heat transfer tubes by the light pipe. Its structural feature is to form a series of spiral annular T-shaped tunnels on the outer surface of the pipe. When heat medium outside the tube is formed in a tunnel in a series of bubble nuclei, four weeks in a heated state to a mountain tunnel chamber, the rapid expansion of the bubble nucleus lumen is filled, continuously heated rapidly increases the inner pressure of the bubble, a fine bubble from the tube surface to promote Squirting quickly in the seam. When injecting of bubbles with a large force erosion site, and a certain partial vacuum, so that the surrounding temperature of the liquid pouring into the lower T-shaped tunnel, the formation of continuous boiling. In this boiling mode, the unit surface area r} takes away much more heat per unit time than the light pipe, and this type of pipe has a higher boiling heat transfer capacity.
2, the characteristics of T finned tube
Heat transfer effect. In R113T boiling tube heat transfer coefficient of the light pipe than 1.6 times a 3.3 times higher. Conventional optical tube heat exchanger, or only when the bubble point of the high boiling temperature of the hot medium of ten 12 ℃ a cold medium 15 ℃, blowing cold medium will boil. The T-type finned tube heat exchanger requires only a temperature difference of 2 ° C to 4 ° C, the cold medium can boil, and the bubble is fine, continuous and fast, forming a unique advantage compared with the light pipe.
The single tube experiment with Freon 11 as the medium shows that the heat transfer coefficient of the T-tube is up to 10 times that of the light pipe, and the experiment results of the small tube bundle with liquid ammonia as the medium, the total heat transfer coefficient is 2.2 times that of the light pipe; The industrial reboiler calibration of C3 and C4 hydrocarbon separation towers shows that at low load, the total heat transfer coefficient of the T-tube is 50% higher than that of the smooth tube and 99% higher at high load.
3.T finned tubes are less expensive than aluminum porous surface heat transfer tubes.
Because the gas-liquid disturbance inside the tunnel is very intense and the gas is ejected at high speed along the T-slot, it is not easy to scale even in the T-slot or the outer surface of the pipe. This ensures that the equipment can be used for a long time without heat transfer effect. The effect of scaling.
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