Numerical Investigation of Flow behavior and Heat TransferCharacteristics inside Herringbone Microfin Tube

摘要

A numerical investigation is carried out for single phase flow behavior and heat transfer characteristics inside herringbone microfin tube by using a commercial CFD code FLUENT. It solves the three-dimensional Navier- Stokes equations in strong conservation form. Turbulence closure is provided by the standard k-? turbulent model with enhance wall treatment. Numerical results showed that herringbone microfins generated four circulation flows in the tube’s cross-section, where flow is accumulated from the core region to the wall in fin-diverging portion and moved away from the wall in fin-converging portion. Flow around the microfins is complicated and it affects local friction factor distribution. These cross-sectional flow behaviors play a significant role in heat transfer enhancement.