R134a在螺纹管内冷凝换热及压降特性毛舒适;陶乐仁;李庆普;吴生礼;张丹亭【摘 要】anceTo investigate the effects of condensation temperature and diameter of inner-grooved tubes on flow evaporation and condensation performance of R134a, thr
R134a在螺纹管内冷凝换热及压降特性礼物怎么画毛舒适;陶乐仁;李庆普;吴生礼;张丹亭【摘 要】To investigate the effects of condensation temperature and diameter of inner-grooved tubes on flow evaporation and condensation performance of R134a, th
Film Coefficient(对流换热系数)流体与固体表面之间的换热能力,比如说,物体表面与附近空气温差1℃,单位时间单位面积上通过对流与附近空气交换的热量。单位为W/(m^2·℃)margin call。表面对流换热系数的数值与换热过程中流体的物理性质、换热表面的形状、部位、表面与流体之间的温差以及流体的流速等都有密切关系。物体表面附近的流体的流速愈大,其表面对流换热系数也愈大。如人处在风速