Search

This article studies the impact of multi-nanoparticles on the entropy generation where heat transfer in Oldroyd-B fluid is subjected to Joule heating and heat generation. C 2 H 6 O 2 is assumed to obey the constitutive behavior in the context of the Oldroyd-B model. Three types of nanoparticles ( Al 2 O 3 , TiO 2 and SiO 2 ) are assumed to be dispersed simultaneously in C 2 H 6 O 2 . The numerical scheme is used for the numerical simulations and simulations are observed and various predictions are made. The dynamics of entropy generation versus relaxation and retardation times. Momentum relaxation time is helpful in controlling entropy generation. It is also observed that C 2 H 6 O 2 with Al 2 O 3 has minimum entropy generation relative to C 2 H 6 O 2 with Al 2 O 3 and TiO 2 and C 2 H 6 O 2 with Al 2 O 3 , TiO 2 and SiO 2 . Relative to hybrid and mono-nanoparticles, the highest wall shear stresses are noticed in C 2 H 6 O 2 with tri-nanoparticles is observed. Momentum retardation time enhances entropy generation. Therefore, it is recommended not to use fluid with Oldroyd-B behavior in mechanisms where entropy generation is not required. In mechanisms where entropy generation is not required, the base fluid or nanofluid should not be heat-generating because heat generation helps in enhancing the generation of entropy. However, heat-absorbing fluid would be favorable for the minimization of entropy. [ABSTRACT FROM AUTHOR]

This article is a study of heat and mass transport in Maxwell fluid mixed with tri, hybrid and mono nanoparticles. Using conservation laws and correlations among thermophysical characteristics of the base fluid, tri, hybrid and mono nanoparticles, the flow situation is converted into mathematical problems. Boundary layer (BL) approximations are used to approximate these mathematical models. The finite element approach is used to solve the non-dimensional problems numerically. The behavior of viscoelastic materials on momentum, temperature and concentration is investigated. Al 2 O 3 , TiO 2 and SiO 2 are simultaneous dispersed and case of tri (Al 2 O 3 , TiO 2 and SiO 2), hybrid (Al 2 O 3 and TiO 2) and mono (Al 2 O 3) are considered. It is possibly achieved the convergent and mesh-free solutions. Present results are validated. Momentum relaxation time determines the characteristics of fluid to restore momentum changes. Therefore, fluids with more viscoelastic property (with high Deborah number) have smaller viscous region relative to the fluid with smaller Deborah. There is a remarkable decrease in momentum transport versus an increase in Deborah number is noted. It is noted that Deborah number for tri-nanofluid has the smaller effects on flow relative to its impact on the flow of hybrid and mono nanofluids [ABSTRACT FROM AUTHOR]