This paper describes an experimental and theoretical research on the two-phase flow pattern transition of downflow in vertical helical coils in an air-water loop.
本文对低压水-空气两相流动在立式螺旋管内向下流动的流型及其转变特性进行了实验和理论研究。
The effect of inorganic additives on an's crystal pattern transition is studied by DSC method, and the surface treatment of an is investigated by polymer surfactant.
采用热分析法研究了无机添加剂对硝酸铵晶型转变的影响，并用高分子表面处理剂对硝酸铵进行表面处理。
Measures such as development pattern transition, functional vitalization, characteristic intensification, and quality promotion shall be adopted to boost the renewal of the old commercial district.
应采取转换方式、激活功能、增强特色、提升品位等措施，促进商埠区的更新和改造。
Measures such as development pattern transition, functional vitalization, characteristic intensification, and quality promotion shall be adopted to boost the renewal of the old commercial district.
应采取转换方式、激活功能、增强特色、提升品位等措施，促进商埠区的更新和改造。
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