NUMERICAL INVESTIGATION OF HEAT TRANSFER ENHANCEMENT ON THE EFFECT OF ADDING (AL2O3) NANOPARTICLES TO WATER FLOW IN A HORIZONTAL TUBE INSERTED PENTAGON RINGS


Thesis Type: Postgraduate

Institution Of The Thesis: Erciyes University, Mühendislik Fakültesi, Makina Mühendisliği, Turkey

Approval Date: 2017

Thesis Language: Turkish

Student: Muqdad Khamees Hameed AL-JANABI

Supervisor: Veysel Özceyhan

Abstract:

In this work, a numerical study has been presented to investigate heat transfer characteristics of (Al2O3-Water) nanofluids flow in a circular horizontal tube that fitted pentagon rings by three different pitch lengths (d, 2d, and 3d). To provide fully developed flow inside the test section, specified distances are performed on the entrance and the exit of the tube. The analyses are carried out with three different nanofluids volume fractions 1.5, 3, and 4.5 % in the range of Reynolds number from 5,000 to 15,000. The numerical solution procedure includes the investigation of heat transfer coefficient, Nusselt number, friction factor, surface temperature and the pressure drop characteristics with using finite volume method by applying (k-w) Standard turbulence model to solve the equations of continuity, momentum, and energy in a threedimensional domain. A single-phase approach is employed to model nanofluids and properties of the fluid are applied constant with temperature. The use of (Al2O3-Water) nanofluids with pentagon ring leads to increase in heat transfer and pressure drop over the smooth tube. The heat transfer coefficient increases with the increment of the nanofluid concentrations and Reynolds number, and it shows descending trend with the increment of pitch length or in another meaning increases with the increment of the number of pentagon rings into a tube. Finally, the results showed that the configuration of Al2O3-Water nanofluid with pentagon ring could be used effectively in heat transfer processes