Sürdürülebilir Kalkınma Amaçları

• 2

Yazarlar

• Akbulut, Abdullah(1)
• Buran, Dincer(1)
• Guelcimen, F.(1)
• Guelcimen, Fevzi(1)
• Kaya, M.(1)
• Kiliçarslan, A.(1)
• Kurtbas, I.(1)
• Kurtbas, Irfan(1)

• MakaleAçık Erişim2014Scopus SJRQ1/r/munzur/4666
  Effect of Swirl Generator Inserted Into a Tube on Exergy Transfer: Decaying Flow

  Kurtbas, I.; Guelcimen, F.; Kiliçarslan, A.; Kaya, M.

  This study experimentally investigates the effect of conical injector type swirl generator inserts on heat and exergy transfer in a uniform heat flux tube for turbulence regime. One hundred twenty watts of heat are applied by coiling a flexible silicone heater on the tube (copper pipe) with an inside diameter of 62mm and length of 1,200mm. The conical injector type swirl generator has a conical shape, which is similar to a funnel, with angle (alpha) of 30 degrees, 45 degrees, and 60 degrees. Circular holes are drilled on the conical injector type swirl generator as three different cross-sectional areas (A(h)). The total areas (A(t) =N.A(h)) of the holes on the conical injector type swirl generator equal each other. Because of this, the three different holes numbers (N) are produced. Flow directors having three different angles (beta=30 degrees, 60 degrees, and 90 degrees) to radial direction are attached to every one of the holes. This study is a typical example for decaying flow. Reynolds number (Re) was varied from 10,000 to 35,000, so the flow was considered as only a turbulent regime. All experiments were conducted with air accordingly; Prandtl number was approximately fixed at 0.71. The local and average heat transfer Nusselt number (Nu(h)) and exergy transfer Nusselt number (Nu(e)) are calculated and discussed in this article. It is found that the Nu(h) increases with an increase in Reynolds number, director angle (beta), and director diameter (d) but with a decrease in the conical injector type swirl generator angle (alpha). However, Nu(e) decreases depending on the same independent parameters.

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  AtıfWoS12·OpenAlex13

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• MakaleAçık Erişim2009Scopus SJRQ1/r/munzur/4050
  Heat transfer augmentation by swirl generators inserted into a tube with constant heat flux

  Kurtbas, Irfan; Guelcimen, Fevzi; Akbulut, Abdullah; Buran, Dincer

  A novel conical injector type swirl generator (CITSG) is devised in this study. Performances of heat transfer and pressure drop in a pipe with the CITSG are experimentally examined for the CITSGs' angle (alpha) of 30 degrees, 45 degrees and 60 degrees in Reynolds number (Re) range of 10,000-35,000. Moreover, circular holes with different numbers (N) and cross-section areas (A(h)) are drilled on the CITSG. In this way, total areas (A(t) = N . A(h)) of the holes on the CITSG are equaled each other. Besides, flow directors having three different angles (beta = 30 degrees, 60 degrees and 90 degrees) to radial direction are attached to every one of the holes. This study is a typical example for decaying flow. All experiments were conduced with air accordingly; Prandtl number was approximately fixed at 0.71. The local Nusselt number (Nu(x)), heat transfer enhancement ratio (Nu(ER)) and heat transfer performance ratio (Nu(PR)) are calculated and discussed in this paper. It is found that the Nu(ER) decreases with increase in Reynolds number, the director angle (beta), the director diameter (d), and with decrease in the CITSG angle (alpha). Likewise, variation of Nu(PR) and Nu(ER) is also essentially similar for the same independent parameters. (C) 2009 Elsevier Ltd. All rights reserved.

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  AtıfWoS32·OpenAlex31

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