Yazarlar

• Akyürek, Eda Feyza(1)
• Celen, Ali(1)
• Celen, Pinar(1)
• Cellek, Mehmet Salih(1)
• Dalkiliç, Ahmet Selim(1)
• Donmez, Aydin Haci(1)
• Karakoyun, Yakup(1)
• Manay, Eyuphan(1)
• Sahin, Bayram(1)
• Taner, Tolga(1)
• Wongwises, Somchai(1)
• Çebi, Alican(1)

• MakaleAçık Erişim2018Scopus SJRQ2/r/gumushane/16804
  Entropy generation of nanofluid flow in a microchannel heat sink

  Manay, Eyuphan; Akyürek, Eda Feyza; Sahin, Bayram

  Present study aims to investigate the effects of the presence of nano sized TiO2 particles in the base fluid on entropy generation rate in a microchannel heat sink. Pure water was chosen as base fluid, and TiO2 particles were suspended into the pure water in five different particle volume fractions of 0.25%, 0.5%, 1.0%, 1.5% and 2.0%. Under laminar, steady state flow and constant heat flux boundary conditions, thermal, frictional, total entropy generation rates and entropy generation number ratios of nanofluids were experimentally analyzed in microchannel flow for different channel heights of 200 mm, 300 mm, 400 mm and 500 mm. It was observed that frictional and total entropy generation rates increased as thermal entropy generation rate were decreasing with an increase in particle volume fraction. In microchannel flows, thermal entropy generation could be neglected due to its too low rate smaller than 1.10e-07 in total entropy generation. Higher channel heights caused higher thermal entropy generation rates, and increasing channel height yielded an increase from 30% to 52% in thermal entropy generation. When channel height decreased, an increase of 66%-98% in frictional entropy generation was obtained. Adding TiO2 nanoparticles into the base fluid caused thermal entropy generation to decrease about 1.8%-32.4%, frictional entropy generation to increase about 3.3%-21.6%. (C) 2018 The Authors. Published by Elsevier B.V.

  AtıfWoS93·OpenAlex96

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• Derleme MakaleAçık Erişim2018Scopus SJRQ3/r/gumushane/10289
  A REVIEW OF FLOW BOILING IN MINI AND MICROCHANNEL FOR ENHANCED GEOMETRIES

  Çebi, Alican; Celen, Ali; Donmez, Aydin Haci; Karakoyun, Yakup; Celen, Pinar; Cellek, Mehmet Salih; Dalkiliç, Ahmet Selim; Taner, Tolga; Wongwises, Somchai

  Flow boiling researches in enhanced geometries practiced recently have been summarized in this review. Classical approximations in macroscale flows have not applied to the flows with small hydraulic diameters, so, this subject has been paid attention by the researchers. Application areas of these structures are increasing continuously due to cooling need in small confined spaces. The related studies have been reviewed in a chronological manner and their parameters have been given in a table in order for the researchers to observe the scientific duration regarding the progresses on this subject. Almost all papers on this subject have been produced after 2000, therefore, this subject is considered as an actual one to improve and worth to study in the literature. This study can not only be evaluated as the beginning argument for the researchers involved in flow boiling process in mini and microchannel, but it also consists of new works on the investigated subject.

  AtıfScopus35·WoS30·OpenAlex33·TR Dizin4

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