Adegun, I.K.Okoshone, J.O.Popoola, O. T.2026-05-122026-05-122013Adegun, I.K. Okoshone, J.O. & Popoola, O.T. (2013): Effects of Eccentricity of the Ellipse and Type of Fluid Flowing on Heat Transfer in Elliptic Pipes. Journal of Engineering Research.18 (2); 41-530795-2333https://uilspace.unilorin.edu.ng/handle/123456789/18338The paper presents laminar forced convection of pseudo-plastic, Newtonian and dilatants fluids inside elliptic tubes with the intention of eliciting the effects of eccentricity of the geometry and the applicable heat exchanging fluids on flow pattern and heat transfer by the configuration. Power-Law for non-Newtonian fluids in conjunction with continuity, momentum and energy transport equations were adopted for the solution. A thermal boundary condition of uniform wall temperature was considered for the analysis. A computational algorithm was developed from the governing equations using a Finite Difference Method (FDM). A program was written in Quick Basic to generate the results for the influence of the variables considered to be of interest. The results obtained show that pseudo-plastic fluids flowing in elliptic duct transfer more heat and appear to be a better heat exchanging fluid than other fluids. For fluids with flow behavior index n=1/3 , n=1 and n = 3, the mean Nusselt numbers are respectively 4.1734, 3.6906 and 3.2168. These results agree closely with the values obtained by Cotta and Ozisik [Nu =4.1753 for n=1/3 and Nu= 3.4090 for n=3]. It was noted that an eccentricity range of 0.866<e<1 is practically realistic for optimum heat transfer. It is also worth nothing that more heat is transferred from the end of minor axis than any other part of the ellipse’s circumference. The results are applicable to the design and analysis of heat exchangers which are being incorporated in a wide variety of unique, compact and efficient cooling applications such as electronic cooling, nuclear reactors, medical and biomedical devices, and electric transformer.enLaminarConvectionNon-NewtonianElliptic configurationArticle