Heat transfer analysis in carbon nanotube-water between rotating disks under thermal radiation conditions

摘要

Abstract In this paper, heat transfer in a carbon nanotube based fluid between two parallel rotating disks is investigated. The governing equations are solved by Least Square Method (LSM) using a semi-analytical code. Water is considered as the base fluid and two kind of carbon nanotube (CNTs), single-walled carbon nanotube (SWCNT) and Multi-walled carbon nanotube (MWCNT) are added as the second phase or additives to the base fluid. The problem is solved for different nanoparticles volume fraction and Reynolds numbers to study the effect of some parameters such as scaled stretching parameters (A1, A2), Rotation parameter (Ω), Radiation parameter (Rd) and thermal Biot numbers (γ1,γ2) on the skin friction factors and Nusselt numbers. Results show that in most cases, SWCNTs leads to more heat transfer and temperature profiles compared to MWCNTs. Highlights ? Heat transfer of the carbon nano-tube (CNT)-water between the rotating disks is analyzed. ? The governing equations are transformed to a set of nonlinear BVPs. ? An analytical solution of the problem is obtained using the Least Square Method. ? Effects of physical factors such as nanoparticle volume fraction and rotating velocity are discussed. ]]>