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Inserts Intensifying Heat Transfer Inside the Tubes: Design, Investigation, and Performance Efficiency Criteria
Krajewski, W. and Lodziej, A. Ko Inserts Intensifying Heat Transfer Inside the Tubes: Design, Investigation, and Performance Efficiency Criteria Chemical Papers, Vol.57, No. 6, 2003, 397-402
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Author(s) |
Krajewski, W.
Lodziej, A. Ko
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| Title |
Inserts Intensifying Heat Transfer Inside the Tubes: Design, Investigation, and Performance Efficiency Criteria
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| Journal name |
Chemical Papers
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| Publication date |
2003
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| Year available |
2003
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| Volume number |
57
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| Issue number |
6
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| ISSN |
0366-6352
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| Start page |
397
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| End page |
402
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2003
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| Language |
english
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| Subject |
290000 Engineering and Technology
290600 Chemical Engineering
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| Abstract/Summary |
The use of tube inserts for enhancing heat transfer during air flow was investigated in regard to their adverse e ect of the increase of pressure drop. The pressure drop and heat transfer characteristics of nine designed metal inserts were measured and correlated in terms of Fanning friction factor, Colburn factor, and Nusselt number vs. Reynolds number. The selection of an optimal insert was difficult since the variations of f—j—Nu charts did not provide unequivocal information. The flow, heat, and heat-flow efficiencies were formulated in order to select the best carrier for two general cases: the constant flow (V-case) and constant pumping power (N-case). A one-dimensional criterion (εhf vs. Re) and a three-dimensional one (εhf vs. εh and εf) as well as unavoidable thermal and flow limitations of the process were discussed.
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