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Heat Transfer Research

年間 18 号発行

ISSN 印刷: 1064-2285

ISSN オンライン: 2162-6561

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.7 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.4 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00072 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.43 SJR: 0.318 SNIP: 0.568 CiteScore™:: 3.5 H-Index: 28

Indexed in

THERMAL PERFORMANCE OF A PIN FIN WITH UNEQUAL CONVECTIVE COEFFICIENTS OVER ITS TIP AND SURFACE

巻 49, 発行 13, 2018, pp. 1247-1273
DOI: 10.1615/HeatTransRes.2018020730
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要約

It is generally understood that heat transfer of a fin increases with its length. In cases where the fin tip experiences significantly higher convective coefficients, a situation exists where the heat transfer decreases with its length. Applications of this situation may exist in air conditioning, refrigeration, and electronics cooling. Analytical results for one-dimensional temperature distribution and heat transfer rate are presented for such a pin fin. A critical tip-to-surface coefficient ratio h(= hcrit) depending only on the transverse Biot number Bi exists, for which the heat transfer is independent of length. For "subcritical" conditions (h < hcrit), fin heat transfer increases with length, as is commonly known. In this case, long fins will be necessary for maximizing heat transfer. For "supercritical" situations (h > hcrit), however, the heat transfer rate decreases with length, asymptotically approaching that for an infinitely long fin. Here, short fins will suffice to provide near-maximum heat duty. Compared to the unfinned base exposed to the tip coefficient, subcritical fins will enhance heat transfer; under supercritical situations, they will insulate the surface. However, compared to the finless base exposed to the surface coefficient, fins will always increase heat transfer. If the fin tip is employed to accurately measure the fluid temperature, the dimensionless fin length L must be no less than Lmin, which is a function only of Bi and h/hcrit . An analytical expression for Lmin necessary to keep the relative error within one percent has been developed. Whether the fin is used to enhance heat transfer or measure fluid temperature, the fin cross section should have as high surface area-to-volume ratio as possible.

によって引用された
  1. Mehendale Sunil, Thermal-Hydraulic Optimization of Open-Cell Metallic Foams Used as Extended Surfaces, Journal of Heat Transfer, 143, 7, 2021. Crossref

  2. Imdad Aaqib, Ali Hassan, Farooq Haroon, Ali Hafiz, Effect of condensate flow rate, surface tension, density and vapor velocity on condensate retention of wire wrapped tubes, Thermal Science, 26, 1 Part B, 2022. Crossref

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