Numerical heat transfer in a rectangular duct with a non-newtonian fluid with shear-rate dependent thermal conductivity

직사각형 덕트에서 전단율에 의존적인 열전도율을 갖는 비뉴턴 유체의 열전달 향사아에 관한 수치적 연구

The present study investigates the effect of the shear rate-dependent thermal conductivity of non-newtonian fluids on the heat transfer enhancement in a 2:1 rectangular duct flow. An axially-constant heat flux and a peripherally-constant temperature boundary conditions(H1) was adopted for a top-wall-heated configuration. The present numerical results of Nusselt numbers for SRDC(Separan) show heat transfer enhancement over those of SRIC. The Nusselt numbers increased linearly as Reynolds numbers increased. The heat transfer enhancement is due to an increased thermal conductivity near the wall, which is attributed to the shear rate-dependence.