Method for enhanced heat transfer
First Claim
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1. A method for enhanced heat transfer between a first fluid at first inlet temperature and a second fluid at second initial temperature substantially different from said first inlet temperature in a heat exchanger wherein said first fluid is flowed through at least one metal tube in heat transfer relation with said second fluid outside said tube, comprising the steps of:
- providing a single layer of randomly distributed metal bodies each individually bonded to the tube inner surface substrate spaced from each other and substantially surrounded by said substrate so as to form body void space with the tube effective inside diameter and body height related to each other such that in the ratio e/D, wherein e is the arithmetic average height of said bodies on said substrate and D is the effective inside diameter of the tube, e/D is at least 0.006, and the body void space is between 10 percent and 90 percent of the substrate total area; and
passing said first fluid through said tube under turbulent flow conditions in at least part of said tube such that its Equivalent Reynolds Number in such tube part is at least 9,000.
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Abstract
An inner surface substrate of metal tubes is provided with a single layer of randomly distributed metal bodies bonded to the substrate, spaced from each other, and substantially surrounded by the substrate to form body void space.
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Citations
4 Claims
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1. A method for enhanced heat transfer between a first fluid at first inlet temperature and a second fluid at second initial temperature substantially different from said first inlet temperature in a heat exchanger wherein said first fluid is flowed through at least one metal tube in heat transfer relation with said second fluid outside said tube, comprising the steps of:
- providing a single layer of randomly distributed metal bodies each individually bonded to the tube inner surface substrate spaced from each other and substantially surrounded by said substrate so as to form body void space with the tube effective inside diameter and body height related to each other such that in the ratio e/D, wherein e is the arithmetic average height of said bodies on said substrate and D is the effective inside diameter of the tube, e/D is at least 0.006, and the body void space is between 10 percent and 90 percent of the substrate total area; and
passing said first fluid through said tube under turbulent flow conditions in at least part of said tube such that its Equivalent Reynolds Number in such tube part is at least 9,000. - View Dependent Claims (2, 3, 4)
- providing a single layer of randomly distributed metal bodies each individually bonded to the tube inner surface substrate spaced from each other and substantially surrounded by said substrate so as to form body void space with the tube effective inside diameter and body height related to each other such that in the ratio e/D, wherein e is the arithmetic average height of said bodies on said substrate and D is the effective inside diameter of the tube, e/D is at least 0.006, and the body void space is between 10 percent and 90 percent of the substrate total area; and
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Current AssigneeUOP Des Plaines IL A NY General Partnership
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Original AssigneeUnion Carbide Corporation (Dow, Inc.)
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InventorsRagi, Elias G., Fenner, Gary W.
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Primary Examiner(s)Richter, Sheldon
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Application NumberUS06/015,425Time in Patent Office624 DaysField of Search165/1, 165/133, 138/38, 138/146, 428/553, 428/559US Class Current165/133CPC Class CodesF28F 13/08 by varying the cross-sectio...F28F 13/185 Heat-exchange surfaces prov...
