本文介绍L齿型螺旋肋片管表面放热系数沿试验管周向的变化规律。作者采用试验与数值计算相结合的方法。试验中仅在肋片管肋肩的一个角度埋设热电偶,在保持试验工况不变的情况下旋转试验管,从而测得不同角度上的肋肩温度。然后列出二维有限差分方程,通过计算求得该种肋片管表面放热系数在不同R_c下沿周向的变化规律。 This article describes the L tooth-shaped spiral fin tube surface heat transfer coefficient along the circumference of the test tube changes. The author uses a combination of experimental and numerical methods. In the test, the thermocouple was buried only at one angle of the ribbed fin of the fin tube, and the test tube was rotated while keeping the test condition unchanged to measure the temperature of the rib shoulder at different angles. Then the two-dimensional finite difference equations are listed. The variation rule of the surface heat dissipation coefficient of the finned tubes in different circumferences in different R_c is calculated.