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| Preparation of aqueous emulsion |
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Heat exchanger with multiwall tubes
| Details |
Inventors: Huigen, Johannes H.; Tromp, Theodoor J.; Vrijen, Jan; van Westenbrugge, Johan K.;
Assignee: B.V. Neratoom (The Hague, NL)
Primary Examiner: Davis, Jr.; Albert W.
Assistant Examiner:
Attorney, Agent or Firm: Kenyon & Kenyon
A heat exchanger having a housing with one or more tubes therein for the transportation of a first fluid through the tubes and a second fluid through the housing and at least partially around the tube or tubes, in which each tube includes two concentric walls with a thin layer or thin layers of a relatively soft material between them applied to the outer surface of the inner wall and to the inner surface of the outer wall. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a heat exchanger and a tube for use therein, with which the problems outlined above do not occur or at any rate occur to a much lesser extent.
This object is attained, according to the invention, with a heat exchanger in which each tube comprises two or more adjoining concentric walls between which a thin layer or thin layers of a relatively soft material compared with the material of the concentric walls, is provided on the outer surface of the inner wall and on the inner surface of the outer wall.
A tube built up from two or more adjoining concentric walls is characterized, according to the invention by one or more thin layers of a relatively soft material on the outer surface of the inner wall and the inner surface of the outer wall, of each two adjoining walls.
Preferably, according to the invention, each layer of relatively soft material comprises a substance having a good heat conductivity.
Suitable material is a pure metal, for example, pure copper or aluminum or a paste, depending on the operating temperature contemplated.
The layers have preferably an average thickness in the order of magnitude of the roughness profile of the respective contacting wall surfaces.
Good results have been obtained, for example, with a single layer in a thickness of 25-50 .
mu.
m with a roughness of 5 .
mu.
m for both contacting wall surfaces.
According to the invention, the interface between each pair of adjoining surfaces of a multi-wall pipe is, as it were, filled with a soft layer, whereby the metallic contact between the pipe walls is improved.
As a result, the heat resistance is reduced, whereas the crack-arresting qualities are retained.
The improvement in heat conductivity can be explained as follows.
Usually, heat is conducted only via the peaks of the roughness profile where the layers of the pipe are in contact with each other, and via gas commonly held in the interspace between the peaks, which gas may account for as much as 95% of the heat transfer
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