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Journal of Enhanced Heat Transfer

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ISSN Druckformat: 1065-5131

ISSN Online: 1563-5074

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: 2.3 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: 1.8 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: 0.2 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: 0.00037 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: 0.6 SJR: 0.433 SNIP: 0.593 CiteScore™:: 4.3 H-Index: 35

Indexed in

THE IMPACT OF FIN DEFORMATION ON FLOW BOILING HEAT TRANSFER AND PRESSURE DROP INMICROFIN TUBES

Volumen 23, Ausgabe 3, 2016, pp. 197-220
DOI: 10.1615/JEnhHeatTransf.2017020547
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ABSTRAKT

In air-conditioning and refrigeration (HVACR) equipment, microfin or internally grooved tubes are commonly used to enhance the thermal performance of evaporators and heat pumps. Such tubes are mechanically expanded by a mandrel into a fin pack to minimize the thermal contact resistance between the tube and the air side fins. However, tube expansion also deforms the inner enhancements to varying degrees, which degrades the in-tube thermal performance. Extensive published data on boiling heat transfer coefficients and pressure drop in pristine microfin tubes exist. However, there is lack of knowledge about the influence of microfin deformation on the thermal-hydraulic performance of microfin tubes. This brings into question the use of pristine tube data for designing HVACR heat exchanger equipment. In this work, we first present an analysis of the changes in the internal surface area of microfin tubes arising from tube expansion. A computational model of a coaxial tube heat exchanger is then used to estimate the changes in thermal-hydraulic performance of the expanded microfin tube. In-tube flow boiling of R-410A at 300 kg/m.s2 and 0°C saturation temperature, a condition typically encountered in HVACR applications is simulated. The tube heat transfer rate is degraded with increasing fin deformation, and the loss can be up to 5% for a tube with 10% fin deformation. The refrigerant pressure drop decreases by up to about 6% due to the increase in tube cross-sectional area and the loss in tube surface area caused by mechanical expansion of the tube.

REFERENZIERT VON
  1. Mehendale Sunil, A new heat transfer coefficient correlation for pure refrigerants and near-azeotropic refrigerant mixtures flow boiling within horizontal microfin tubes, International Journal of Refrigeration, 86, 2018. Crossref

  2. Mehendale Sunil S., Condensing heat transfer of pure refrigerants and refrigerant mixtures flowing within horizontal microfin tubes: A new model, International Journal of Refrigeration, 103, 2019. Crossref

  3. Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Flow Boiling Enhancement Techniques, in Two-Phase Heat Transfer Enhancement, 2020. Crossref

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