Patent ID: 7264045

Claim:
A heat exchanger assembly comprising: at least one pair of plates having mating edges and a concave region delimited by said edges to define a fluid passage between said pair of plates, said plates having tubular projections defining an inlet for entering fluid to said passage and an outlet for exiting fluid from said passage to thereby establish a direction of fluid flow, a plurality of dimples projecting into said passage to interact with fluid flow through said passage, a flow divider rib disposed in said fluid passage and parallel to said direction of fluid flow to thereby divide said fluid passage so that said direction of fluid flow is divided into parallel flows in the same direction on both sides of said flow divider rib from said inlet to said outlet, and each of said dimples defines a hemispherical shape having a diameter and said dimples are spaced apart transversely to said direction of flow a distance less than said diameter so as to be disposed in overlapping relationship in said direction of fluid flow.