The development of innovative heat exchangers with improved heat transfer performance is an important concern for heat transfer applications. The use of passive techniques such as vortex generators, surface roughness, augmentation of heat transfer area, or the combination of passive techniques is effective to improve the performance of heat exchangers. This review briefly summarizes the passive heat transfer enhancement techniques and the most important types of heat exchangers. Many effective design parameters have been briefly discussed to improve the performance of passive heat transfer techniques for heat exchangers.
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