NUMERICAL INVESTIGATION OF HEAT TRANSFER AUGMANTION ON ADDING (CUO) NANOPARTICLES TO WATER IN A HELICAL INSERTED TUBE


Thesis Type: Postgraduate

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

Approval Date: 2017

Thesis Language: English

Student: Haidar Majeed Hachim

Supervisor: Veysel Özceyhan

Abstract:

This quantitative study investigated the turbulent convective heat transfer in horizontal

tube through two passive techniques: the first one including nanoparticles (CuO) with

different volume concentrations added into the base fluid water with Reynolds number

ranging between 4000<Re<14000 and the second one using geometry insert in tube

(helical with cross section area airfoil naca 0030) with the coiled wire inserts set up with

0.75 mm separation from inner tube wall with three pitch ratios through CFD and

SOLIDWORKS. The pairing of pressure and speed was carried out with SIMPLEC

algorithm. The quantitative solution procedure included the investigation of the heat

transfer and pressure drop properties by using” Finite Volume Method” with standard

“k-w Turbulence Model” to solve the continuity, momentum, energy and turbulence

equations in three dimensional domain.

The quantitative results indicated that heat transfer increased with the use of CuO-water

nanofluid and helical ribs. This increment was stemmed from the volume concentration,

helical pitch rate and Reynolds number. Where heat transfer increased with the decrease

of helical pitch ratio and raised both volume density and Reynolds number, the friction

factor was almost the same as that utilizing nanofluid and water in smooth tube and

augmented with the increased volume concentration and reduced the helical pitch ratio

and decreased with the increase in Reynolds number.