| 摘要 |
PURPOSE:To reduce a flow drag of heating medium passing through fins and simultaneously to improve a heat exchanging efficiency, by providing fan-like louvers along the streamline of heating medium created around heating tubes arranged in a staggered fashion. CONSTITUTION:A heating medium flowing in the direction A collides with a heating tube 1, flows along a streamline B and is straightened through the upstanding portion 7 of louver 5. A heating medium flowing along the outer surface of louver 5 around the heating tubes arranged in a zigzag fashion is straightened by the upstanding portion outside the lorver 5, as shown with E. The accelerated heating medium merges with another flow at the rear of heating tube 1, progressively collides with the heating tube 1 arranged at the downstream and flows along the streamline B. A heating medium which flows as shown by the streamline B is branched away at an edge 6 into turbulent flows and has its boundary layer reduced under the flow dividing action of fins. The coefficient of boundary film is thus increased. A radiation of heat which spreads from the heating tube 1 in a radial direction is transmitted through the louver 5 as shown by a streamline C, whereby allowing for the uniform distribution of heat over the fins in an efficient manner, without interrupting the flow line of heat. |
