Variable Heat Exchanger Passages for Uniform Heat Transfer

The patent applies local quality by varying the cross-sectional flow area at specific locations within the heat exchanger passages. Augmentation features are strategically placed to create non-uniform flow distribution, increasing heat transfer coefficients in regions where thermal gradients are most severe. This localized modification optimizes heat transfer where needed without requiring complete redesign of the entire passage geometry, thus improving structural integrity while limiting complexity increases.

The patent changes geometric parameters of the flow passages by introducing augmentation features that modify the cross-sectional area. These parameter changes alter flow rates and velocities locally, which in turn changes heat transfer coefficients. By adjusting these geometric parameters strategically, the patent achieves more uniform heat transfer distribution and reduces thermal stresses without fundamentally changing the overall device structure.

Rather than uniformly increasing flow area throughout the heat exchanger, the patent applies local quality by placing augmentation features only in specific regions where thermal gradients are most severe. This selective approach enhances heat transfer rates in critical areas while avoiding uniform area increases that would exacerbate thermal gradients and stresses across the entire structure.

The patent applies preliminary anti-action by strategically positioning augmentation features to counteract anticipated thermal gradient effects. By pre-positioning these features in regions where thermal stresses are most likely to occur, the design proactively prevents excessive thermal gradient buildup before it can cause structural issues, thus improving heat transfer without proportionally increasing thermal stresses.

The patent limits complexity increases by applying augmentation features only in specific local regions rather than uniformly throughout the entire heat exchanger. This selective placement targets the most critical thermal gradient areas, achieving improved heat transfer uniformity with minimal additional geometric complexity in non-critical regions.

The patent applies partial action by implementing augmentation features in only the most critical regions where thermal gradients cause the greatest stress, rather than uniformly throughout the entire heat exchanger. This partial modification achieves sufficient heat transfer improvement to reduce thermal stresses without requiring complete redesign of all passages, thus limiting complexity increases while maintaining reliability improvements.