Heat transfer analysis of nanofluids with variable stream conditions using numerical approach – RKF45

Erode Natarajan, Ashwin Kumar (2016) Heat transfer analysis of nanofluids with variable stream conditions using numerical approach – RKF45. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Nanofluid is a stable, colloidal suspension of low volume fraction of ultrafine solid particles. These solid particles are in nano metric dimension, dispersed in conventional heat transfer fluids to offer a dramatic enhancement in conductivity. Three nanoparticles namely Alumina, Copper and Titanium dioxide; two base fluids - fresh water and sea water are selected to form nanofluids. The fluid dynamics equation for incompressible flow is selected. In the present study, the highly nonlinear partial differential equations of momentum and energy fields have been simplified using suitable similarity transformations. Both the momentum equation and energy equation are solved for steady, two-dimensional, stagnation-point, laminar flow of a viscous nanofluid past a stretching / shrinking porous plate. Stream functions pertaining to current research work is selected from literature reviews. Various stream conditions are introduced into the equations for better understanding of nanofluids’ behavior. Finally, for executing the coupled equations, a new mathematical software known as MAPLE 18 is used. This software uses a fourth-fifth order Runge–Kutta–Fehlberg method as a default to solve boundary value problems numerically. Temperature and velocity profiles are obtained in the form of graphs for all nanofluids that are taken into consideration. Then the graphs are analyzed and compared amongst them. The results proved Copper nanoparticle to be more effective. The results of Cu-fresh water nanofluid and Cu-seawater nanofluid are compared, and it is proven that effectiveness depends on the stream conditions. The study has concluded that magnetic effect increases the heat transfer efficiency and Copper nanofluid is most suitable for stagnation-point flow. Studying sea water based nanofluids in multi-environment will increase the chance of using sea water as coolant in various applications.

Item Type:Thesis (Masters)
Subjects:T Technology > TJ Mechanical engineering and machinery > TJ836-935 Hydraulic machinery
ID Code:8783
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:24 Jan 2017 11:56
Last Modified:24 Jan 2017 11:56

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