Author/Authors :
Esmaeilizadeh Davani، M نويسنده Department of Chemical Engineering, Faculty of Engineering, Quchan University of Advanced Technology, Quchan, Iran , , Mohebbi Najm Abad، J نويسنده Department of Computer Engineering, Quchan Branch, Islamic Azad University, Quchan, Iran , , Mollaabbasi، R نويسنده Department of Chemical Engineering, Faculty of Engineering, Quchan University of Advanced Technology, Quchan, Iran ,
Abstract :
Drilling muds are the most applicable fluids in drilling. Two basic types of drilling
fluids are used, water based muds (WBM) and oil based muds (OBM). Water based
muds are more applicable than oil based muds. One of the most important applications
of this fluid is cooling a bit. Chemical engineers try to change drilling mud’s
rheological property in order to increase heat transfer to the bit. Rheological properties
of drilling muds are well described by the Herschel Bulkley model. Adding polyacrylic
acid to water changes its rheological property to Herschel Bulkley fluid. Standard
equations like Shah and London and Hausen correlations were not able to predict local
Nusselt number of non-Newtonian fluids.This study concerns estimating parameters ofa
local Nusselt number of Herschel Bulkley fluids with CuO nanoparticles in four
concentrations of 0.1, 0.3, 0.6 and 0.05% in constant heat flux and laminar region. A
nonlinear optimization algorithm (CMA-ES) was used to estimate local Nusselt number.
There is good agreement between experimental data and those predicted by proposed
correlations with ? 2 greater than 0.99.
