关键词: 旋流, 管内插入物, 表面凹槽, 复合强化传热, 旋流, 管内插入物, 表面凹槽, 复合强化传热

Abstract: This paper introduced research developments in heat transfer enhancement and tube fouling prevention in the rotational flow tube. New technologies mainly include tube tension，surface groove，and compound heat transfer enhancement. Tube insertion can break boundary layer and achieve online anti-scaling and descaling automatically，however it is difficult to maintain constant heat exchanger efficiency due to normal wear on the wall. Surface groove can achieve heat transfer enhancement in and out of the tube，it also has relatively low fluid resistance，but the manufacturing process is complex. Compound heat transfer enhancement has high heat transfer capacities and the advantages of various heat transfer technologies，and its overall performances can be higher than one kind of technique. Thus compound heat transfer enhancement can be a prospective technology for future applications.

Key words: rotational flow, tube insertion, surface groove, compound heat transfer enhancement, rotational flow, tube insertion, surface groove, compound heat transfer enhancement