A great deal tiny holes become the places where the bubbles are formed with the fluid boiling. The bubbles inflate quickly to permeate the interior chambers. To keep heating makes the pressure within the bubbles augments quickly, which impels the bubbles to spurt out rapidly from the thin slot of the tube surface. Big scouring power and some local negative pressure will be produced when the bubbles spurting out. It makes the lower temperature liquid in the vicinity rush into the tiny holes. In this way the liquid outside the tubes keeps boiling. It can transfer much more heat duty per unit time and surface area as compared to plain tubes. Therefore, this type of tube possesses higher ability of boiling heat transfer.

This kind of tubes is suitable for the cases where the fluid in the shell side has boiling phase change, fluid in the tube side has partial or total condensation and the fluid in the shell side has no fouling tendency, no corrosion to the AI surface.

1  High heat transfer coefficient.

2  It can maintain fluids boiling at a very small temperature difference. Thus, the irreversible loss of heat in transfer processing is greatly reduced.

3  Since the gas-liquid disturbance within the coating is very intense and gas spray along the tube outer surface at high-speed, therefore, it is difficult to scale for both internal coating and the outer surface of tubes. This advantage can ensure long-term use of the device and heat transfer effect will not be affect by scale formation.

1  When the heat load is 25,000-30,000kcal/m, the boiling heat transfer coefficient of Al porous tubes is 6-7 times higher than that of plain tubes.

2  The boiling phase transition temperature is 0.6-0.7℃.

3  Product specification: diameterφ10—φ32, length L≤9000.

It is not permit to scratch, knock and damp the products during transport. If they have to be transported in the humid environment, you must put them in the protection of nitrogen-filled crust first. Dry compressed air should be used at the shell-side of the products in the pressure test, in order to avoid rust on the base tube surface, thereby avoiding congestion of the microporous within coating.