the micro-tube heat transfer and fluid flow of water based al2o3 nanofluid with viscous dissipation

the numerical modeling of the conjugate heat transfer and fluid flow of al₂o₃/water nanofluid through the micro-tube was presented in the paper. the laminar flow regime was considered along with viscous dissipation effect. the diameter ratio of the micro-tube was d_i/d_o = 0.1/0.3 mm with a tube length l = 100 mm. the heat transfer rate was fixed to q = 0.5 w with three different br = 0.1, 0.5 and 1. the water based al₂o₃ nanofluid was considered with various volume concentrations of al₂o₃ particles ϕ = 1, 4, 6, 9% and two diameters of the particles d_p = 10 nm and 47 nm. the analysis was performed on the results for local heat transfer coefficient.