STREAMLINED WAVY FIN FOR FINNED TUBE HEAT EXCHANGER

摘要

The present invention relates to a streamlined wavy fin for a finned tube heat exchanger, which comprises a fin body, an airflow inlet on one end of the fin body, an airflow outlet on the other end of the fin body, mounting holes for mounting tubes on the fin body, and several convex/concave ripples consecutively formed from the airflow inlet to the airflow outlet on the fin body in an orientation of an airflow streamlines. A connection line of the wave crests of the same one convex ripple and a connection line of the wave troughs of the same one concave ripple neighboring the same one convex ripple are both streamlines. The present invention efficiently suppresses the flow separation downstream the circular tubes, and obviously reduces the pressure loss of airflow. And at the same time, the surface areas of the fins are increased, heat transfer resistance on the fin side is decreased, the streamlined fluid flow makes that it is not easy to producing a recirculation flow downstream the circular tubes, and heat transfer performance of the fins at the rear part of the tube bank may be obviously improved, which has better fluid flow and heat transfer performances, the fins is not easy to accumulate dust in use, and stability of heat transfer performance is maintained.

主权项

1. A pre-specified streamline wavy fin for the finned tube heat exchangers, comprising a fin body, an airflow inlet on one end of the fin body, an airflow outlet on the other end of the fin body, and mounting holes for mounting tubes in the fin body, WHEREIN that several convex ripples and concave ripples are consecutively formed from the airflow inlet to the airflow outlet on the fin body along the pre-specified streamlines;
the convex ripples and the concave ripples are provided within the boundaries of a ripple area set on the fin body, the boundaries of the ripple area located at the upper and the lower sides of the mounting holes are all pre-specified streamlines, and are determined according to their stream function values as demanded; the connecting line of the wave crests of the same convex ripple and the connecting line of the wave troughs of the same concave ripple in neighbor are both pre-specified streamlines; the distance between the connection line of the wave crests of the same convex ripple and the connection line of the wave troughs of the neighboring concave ripple or the number of the convex ripple and the concave ripple is determined according to the stream function values of the boundaries of the ripple area as demanded; the pre-specified streamlines are such streamlines that on the central cross section of the channel formed by the tube-bank-plain fin corresponding to the fin body no recirculation flow appears in the region of the tube tails.