Araştırma Makalesi

Yıl 2018,
Sayı: 2, 323 - 333, 19.08.2018
### Öz

### Anahtar Kelimeler

### Kaynakça

Due to no slip flow condition at the wall, the

fluid enter the pipe with a smooth velocity start to develop along the flow to

comply the zero velocity at the wall and maximum at the pipe center. After a

certain distance where the development completed, the velocity profile becomes

fully developed and no longer changes observed along the pipe flow. The region

flow where the velocity profile developes is called developing flow or inlet

flow and the region flow where the fully developed profile govern are called

fully devloped flow. Computation of the flow properties in the fully developed

region can be enabled with various empirical theories, but the complex flow

styructure in pipe inlet region still has not been solved exactly. However It

is quite important to know the flow behavior at the pipe inlet to compute the

right pumping power especially in the fluid heating and cooling short pipe flow

processes. the study performed, the steady pipe flows with Newtonian fluid were

simulated numerically at low Reynolds numbers (ranged 1000 and 25000 ) covering

the three flow regimes (laminer, transition and turbulence). High turbulence

level and smooth velocity profile were assigned to the flow at pipe inlet.

Turbulence flows were solved according to the time mean flow assumption. On the

numerical results obtained, the variation of axial central velocity along the

flow was examined for different relative roughnesses. Consequently, a numerical

correlation which define the axial velocity and fit the numerical values well

is proposed.

- Anselmet, F., Ternat, F., Amielh, M., Boiron, O., Boyer, P., & Pietri, L. (2009). Axial development of the mean flow in the entrance region of turbulent pipe and duct flows. Comptes Rendus Mécanique, 337(8), 573-584. Augustine, J. R. (1988). Pressure Drop Measurements in the Transition Region for a Circular Tube with a Square-Edged Entrance (Master’s Thesis). Bachelor of Science in Mechanical Engineering. The University of Southwestern Louisiana Lafayette, Louisiana. Barbin, A. R., & Jones, J. B. (1963). Turbulent flow in the inlet region of a smooth pipe. Journal of Basic Engineering, 85(1), 29-33. Doherty, J., Ngan, P., Monty, J., & Chong, M. (2007, January). The development of turbulent pipe flow. In 16th Australasian Fluid Mechanics Conference (AFMC) (pp. 266-270). School of Engineering, The University of Queensland. Minkowycz, W. J., Abraham, J. P., & Sparrow, E. M. (2009). Numerical simulation of laminar breakdown and subsequent intermittent and turbulent flow in parallel-plate channels: Effects of inlet velocity profile and turbulence intensity. International Journal of Heat and Mass Transfer, 52(17-18), 4040-4046. Nikuradse J (1966). Gestzmassigkeiten der turbuleten stromung in glatten rohren. Forschung auf dem Gebiet des. Ingenieurwesens. Translated in NASA TT F-10, 359(3), 1932, 1-36. Laufer, J. (1954). The structure of turbulence in fully developed pipe flow. NACA Report, Washington, National Bureau of Standards. Ozisik, M. N. (1985). Heat transfer: a basic approach. New York: McGraw-Hill Patel, V. C., & Head, M. R. (1969). Some observations on skin friction and velocity profiles in fully developed pipe and channel flows. Journal of Fluid Mechanics, 38(1), 181-201. Perry, A. E., & Abell, C. J. (1975). Scaling laws for pipe-flow turbulence. Journal of Fluid Mechanics, 67(2), 257-271. Salami, L. A. (1986). An investigation of turbulent developing flow at the entrance to a smooth pipe. International journal of heat and fluid flow, 7(4), 247-257. Tam, H. K., Tam, L. M., & Ghajar, A. J. (2013). Effect of inlet geometries and heating on the entrance and fully-developed friction factors in the laminar and transition regions of a horizontal tube. Experimental thermal and fluid science, 44, 680-696. White, F. M. (2003). Fluid Mechanics. 5th edition, McGraw–Hill Book Co, New York. Zanoun, E. S., Kito, M., & Egbers, C. (2009). A study on flow transition and development in circular and rectangular ducts. Journal of Fluids Engineering, 131(6), 061204. Zimmer, F., Zanoun, E. S., & Egbers, C. (2011). A study on the influence of triggering pipe flow regarding mean and higher order statistics. In Journal of Physics: Conference Series (Vol. 318, No. 3, p. 032039). IOP Publishing.

Yıl 2018,
Sayı: 2, 323 - 333, 19.08.2018
### Öz

### Kaynakça

Toplam 1 adet kaynakça vardır.

Birincil Dil | İngilizce |
---|---|

Konular | Mühendislik |

Bölüm | Makaleler |

Yazarlar | |

Yayımlanma Tarihi | 19 Ağustos 2018 |

Yayımlandığı Sayı | Yıl 2018Sayı: 2 |