Estimation of heat transfer coefficient of water and ethylene glycol mixture in nanopipe via non-equilibrium coarse-grained molecular dynamics

Abstract

Using coarse-grained molecular dynamics, we estimated the heat transfer coefficient (HTC) of coolant, a mixture (50:50 wt%) of water and ethylene glycol (EG), in a Fe nanopipe. In the Newtonian flow regime, the pipe was heated at 325 K. The HTC increased rapidly along the nanopipe at the thermal boundary layer (TBL). The HTC was estimated to be 3.08 × 10 8 W/m 2 K, and those of water and EG were 1.24 × 10 8 and 1.87 × 10 8 W/m 2 K, respectively. A relationship between the TBL and the HTC existed along the pipe and that the heat transfer mainly occurred in the TBL.