抄録
The steady laminar flow through multiple pipe bends, which form a coiled pipe with periodically changing the plane of curvature, is studied. The heat transfer is analyzed by calculating the temperature and velocity fields, and due to the changing of the plane of curvature, the size and angle of the twin vortices periodically change in multiple pipe bends, indicating a better mixing. In order to estimate the mixing performance depending on the bend connection angle, trajectories of points initially aligned in the pipe plane are calculated and the length of the convolute line is quantatively compared. Local and mean Lyapunov exponents as a qualitative measure are also evaluated.
