| Yazarlar |
Aziz Hakan Altun
Selçuk Üniversitesi, Türkiye |
Doç. Dr. Mehmet GÜRDAL
Kastamonu Üniversitesi, Türkiye |
|
Adnan Berber
Necmettin Erbakan Üniversitesi, Türkiye |
| Özet |
| Effects of heat transfer and flow characteristics on Reynolds numbers of different sinusoidal turbulators placed separately from a pipe in the turbulent flow were investigated experimentally. The experiments were carried out under forced flow and constant heat flow conditions. The elements, which drew a sine curve used as a turbulator, were positioned axially to the channel centre. The experiments were repeated for 3 width values of sinusoidal turbulators that correspond to 3D/4, D/2 and D/4 (D = inner diameter of test pipe). The experiments showed that although there were increases in the rate of heat transfer with the turbulator, they caused considerable pressure drop. As a result, as the width of the turbulator increased, the heat transfer ratio (the Nusselt number) and coefficient of friction increased. Increase in Nusselt number was about 39-86% at D/4 width, 70-119% at D/2 width and 72-170% at 3D/4 width. It was observed that the coefficient of friction was significantly affected by the width of the sinusoidal turbulator, being about 0.02 in the case of straight pipe, 0.184-0.242 at D/4 width, 0.345-0.415 at D/2 width, and 0.416-0.451 at 3D/4 width. In addition, increasing coefficient of friction increased pressure drop and power required for pumping. |
| Anahtar Kelimeler |
| turbulent flow in pipe,heat transfer enhancement,sinusoidal turbulator,pressure drop and friction in pipe |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale |
| Dergi Adı | Maejo International Journal of Science and Technology |
| Dergi ISSN | 1905-7873 |
| Dergi Tarandığı Indeksler | SCI-Expanded |
| Dergi Grubu | Q4 |
| Makale Dili | İngilizce |
| Basım Tarihi | 02-2020 |
| Cilt No | 14 |
| Sayı | 1 |
| Sayfalar | 27 / 42 |
| Makale Linki | http://www.mijst.mju.ac.th/index.asp |
