A fundamental understanding of the various modes of heat transfer and their contributions is critical in the development of enhanced surfaces to augment boiling performance. Recently, a number of studies have highlighted the importance of contact line region in boiling-especially in applications involving thin film evaporation and wicking structures. Contact line region also plays an important role during heat transfer around a nucleating bubble, especially at higher bubble frequencies near critical heat flux (CHF). In this work, a review of the characteristics of the contact line region, the forces at play, and the associated heat transfer mechanisms is conducted. Experimental and analytical works on the contact line region are explored to develop a comprehensive picture of its physical and heat transfer behavior. Various optical and thermal measurement techniques employed by researchers to understand evaporation in the contact line region are also reviewed. The interaction of different forces in this region and the analytical models for predicting the forces is studied. Finally, the contribution of microlayer and contact line heat transfer in nucleate boiling is also presented.

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