Abstract
Pillow-plate heat exchangers (PPHE) represent an innovative, fully welded plate-type heat exchanger. They consist of a stack of panels, which are characterized by “pillow-like” surface. The waviness of the channels enhances mixing in the fluid boundary layers, which consequently augments heat transfer. However, PPHE need further optimization in order to compete with corrugated plate heat exchangers with respect to compactness. In this study, a method to enhance heat transfer in PPHE is proposed, based on a surface modification of pillow plates by secondary dimple structures on their primary wavy surface. The new structured surface of the pillow plates promotes stronger near-wall mixing.
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