Number ratio compared to pipes larger length but containing pure water. In this study that nanofluids can also contributes to optimise pipes compactness, using 2% and 4% of aluminaДЄnd copper respectively dispersed in water flowing through a pipe with given length gives higher axial Nusselt Other hand, secondary flow and axial velocity are slightly affected by nanoparticles volume fraction. However, in mixedД¬onvection case the axial Nusselt number augments considerably especially with рќђ¶рќ‘ў-water nanofluid. At a fixed volume fraction рќњ‘ =Д¤%, the axial Nusselt number does not increase significantly in forced convection case. Water at several volume fractions for both alumina and copper based nanofluids. The results show an increase in heat transfer ratio compared to pure At a fixed Reynolds number рќ‘…рќ‘’ = 300ДЄnd Grashof number equal to 0 and 5Г—105. SIMPLER algorithm with the Tri-Diagonal Matrix Algorithm (TDMA). Method with the schemes of spatial and temporal discretization of second order precision and by using the Mass, momentum and energy with the appropriate boundary conditions have been solved using finite volume Based on single-phase approach, three dimensional conservation equations of The present work is concerned of numerical simulation of three dimensional laminar forced and mixedД¬onvection of two nanofluids рќђґрќ‘™2 рќ‘‚3 -water and рќђ¶рќ‘ў-water flowing through a horizontal tube submitted to aД¬onstant and uniform heat flux. UniversitГ© FrГЁres Mentouri Constantine1, AlgeriaД®-mail: 24 July 2017 Revised: 26 October 2017 Accepted: 4 September 2018 *Laboratoire de Physique EnergГ©tique, DГ©partement de Physique, FacultГ© des Sciences Exactes, Oussama BENZEGGOUTA*, Toufik BOUFENDI* and Sofiane TOUAHRI* Usual fluids and nanofluids in a heated horizontal pipe Journal of Thermal Science and TechnologyД¬omparative study of fluid flow and heat transfer between

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