ABSTRACT
The study of improved heat transfer performance is referred to as heat transfer enhancement or augmentation. The enhancement of heat transfer has concerned researchers and practitioners since the earliest documented studies of heat transfer [1]. In recent years, increasing energy and material costs have provided signicant incentives for development of energy efcient heat exchangers. As a result, considerable emphasis has been placed on the development of various augmented heat transfer surfaces and devices [2,3]. Heat transfer enhancement today is characterized by vigorous activity in both research and industrial practice. This can be seen from the exponential increase in world technical literature published in heat transfer augmentation devices, growing patents, and hundreds of manufacturers offering products ranging from enhanced tubes to entire thermal systems incorporating enhancement technology [1]. In this chapter, single-phase heat transfer augmentation devices are discussed in detail without specic correlations for j and f factors and two-phase heat transfer augmentation devices are briey dealt. An important reference source on heat transfer augmentation devices is Bergles [4].
