US 12,372,313 B2
Variable passages to optimize delta p and heat transfer along flow path
Christopher Ryan Cosher, Vernon, CT (US)
Assigned to RTX Corporation, Farmington, CT (US)
Filed by Raytheon Technologies Corporation, Farmington, CT (US)
Filed on Dec. 15, 2022, as Appl. No. 18/081,909.
Prior Publication US 2024/0200887 A1, Jun. 20, 2024
Int. Cl. F28F 3/02 (2006.01); F28F 1/02 (2006.01); F28F 1/40 (2006.01)
CPC F28F 3/027 (2013.01) [F28F 1/022 (2013.01); F28F 1/40 (2013.01); F28F 2215/00 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A heat exchanger comprising:
an internal passage extending from a first inlet end to a first outlet end;
a first longitudinal length extending from the first inlet end to the first outlet end;
an inner surface of the passage including a first augmentation feature disposed along the first longitudinal length across a full height of the inner surface wherein the first augmentation feature extends along the entire first longitudinal length, wherein inner surface first augmentation feature comprises internal walls separating a plurality of passages for a hot flow;
an outer surface extending from a second inlet end to a second outlet end, the outer surface being in heat transfer communication with the inner surface; and
a first region including portions of both the inner surface and the outer surface adjacent at least a portion of the first inlet end, wherein the first augmentation feature varies a cross-sectional area configured to accelerate a working fluid increasing a flow velocity of the working fluid passing through the heat exchanger in a direction along the entire first longitudinal length and within the first region, wherein the first augmentation feature comprises wall inserts that change the cross-sectional area of the passage within the first region.