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The fluid flow within the tube is affected by helix ribs. Those near the wall rotate along the ribs to form a strong turbulence flow, so that the thickness of the boundary bottom reducing. And the others flowing along the tube axis is periodically disturbed by the ribs. The heat transfer in tube is intensified based on the synthesized acting of these two factors. The type of heat transfer outside the tube is basically condensation. So the heat transfer enhancement outside the tube aims in enhancement of condensation. When there is phase change in the shell side, helix ribs become the drainage channels of the condensation liquid, with the results of the thinner condensation liquid film, the lower heat transfer resistance and the higher condensation heat transfer coefficient.
The spiral tube is especially suitable for the following heat exchanging case: condensation outside tubes, single phase liquid or gas flow inside tubes.
1 The heat transfer is intensified outside and inside the tube simultaneously.
2 The cost of making spiral tube is low.
3 he spiral tube has been widely used in many aspects, including liquid evaporation, vapor condensation, and the single-phase fluid flow heat transfer, no matter gas or liquid, outsides or insides tube.
1 Compared with the plain-tubes heat exchanger, its total heat transfer coefficient can be increased by 20% to 30%.
2 Product specification: Tube diameterφ16—φ32, length L≤9000.