SU1386843A1 - Heat exchanging screw-twisted pipe - Google Patents

Description

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The invention relates to heat engineering and can be used in. tubular heat exchangers for the chemical and other industries.

The purpose of the invention is to intensify heat transfer.

Fig. 1 shows the proposed heat exchange tube; FIG. 2 is a section A-A in FIG. 1 with an oval profile section; in fig. 3 - then the lead with an elliptical profile.

The heat exchange screw-twisted pipe 1 of the oval profile contains transverse annular grooves (extrusions) 2 on the outer surface and directed inward to the pipe and forming the corresponding annular protrusions 3 on the inner surface. The height h of the annular protrusions is 0.02-0.027 oval along the inner tube forming, and the spacing S of their placement is 0.015-0.05 pitch of the screw t of the helical tube 1.

; The profile of section A at the places of issue may have an oval 5 or elliptical 6 Forkus At about depends on the geography: the logo of the issuance of the extrusions 2; for example knurled or stamped. At that time, the physical picture of the internal and external currents is not substantially. varies This is why both professional profiles can be used with the same effect.

The working medium flowing through the heat exchange tube I 5 receives a rotational motion. Ring ledge; 3 impart to the Poetuje a moving motion along a helical trajectory 5 the character of an abnormal flow J significantly intensifying heat transfer from pipe 1,

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The conditions for the formation of hydrodating, -, and current flow structures outside the pipe 1 are largely determined by the flow pattern of the coolant; longitudinal or transverse flow, as well as the layout characteristics of the beam containing the proposed pipes; in longitudinal and transverse steps, in order of location (gaahmat or corridor), porosity, etc. Intensification of heat transfer outside the pipe occurs due to an increase in turbulent thermal conductivity from pressure pulsations caused by flow disturbances in any flow pattern. Therefore, the optimum heat removal from the outer surface for any flow around the pipe is achieved when the ratio is made to the mesquat, twist pitch 1: oval profile of pipe 1 and pitch S of placement of ring extrusions — projections 2 and 3.

The use of the proposed pipe in heat exchangers contributes to reducing the metal consumption of the design of heat exchangers, saving non-ferrous metal and reducing the energy consumption for pumping coolants.

Claims (1)

Invention Formula Heat exchanging screw-twisted tube oval profile, five different with gene what in order to intensify the heat exchange, on the narcotic surface of the pipe with a step equal to 0,015–0.05 pitch of the pipe twist, the transverse annular extrusions were made, and on the inside, the corresponding protrusion heights are equal to 0.02-05027 max. inner surface of the pipe.