一、前言生产技术的发展,促进了对传热理论的研究和新型换热设备的探索。对于应用技术中的换热装置总是要求传热能力强、重量轻、尺寸小、造价低、简单可靠。这就提出了如何强化传热过程的问题。热量的传递要靠导热、对流和辐射三种方式进行。而传热过程的强化,实质上就是对上述三种热传递方式的强化。关于对流换热的强化,已进行了大量的研究和创新,取得了相当丰富的成果。譬如:为强化对流换热,可采取增加流体的湍流程度,用流体的相 I. Introduction The development of production technology has promoted the research of heat transfer theory and the exploration of new heat exchange equipment. For the application of technology in the heat transfer device is always required strong heat capacity, light weight, small size, low cost, simple and reliable. This raises the question of how to enhance the heat transfer process. Heat transfer depends on the heat conduction, convection and radiation in three ways. The heat transfer enhancement, in essence, is to strengthen the above three kinds of heat transfer. As for the enhancement of convection heat transfer, a great deal of research and innovation have been carried out and quite a lot of achievements have been made. For example: to strengthen the convective heat transfer, can take to increase the degree of fluid turbulence, with the fluid phase