Manifold structure for re-directing a fluid stream

A heat exchanger apparatus, comprising:

• a housing defining first manifold cavity and a second manifold cavity and a flow passage interconnecting said first manifold cavity and said second manifold cavity;
• a first fluid opening formed in said housing in fluid communication with said first manifold cavity and having a flow axis oriented in a first direction;
• a second fluid opening formed in said housing in fluid communication with said second manifold cavity and having a flow axis oriented in a second direction;
• a heat exchanger located within the flow passage between the first manifold cavity and the second manifold cavity, the heat exchanger having a plurality of first fluid channels for transmitting a first fluid therethrough in said second direction, and a plurality of second fluid channels for transmitting a second fluid therethrough, the heat exchanger having a first end in fluid communication with said first manifold cavity and a second end in fluid communication with said second manifold cavity;
• a first curved surface forming a base end of said first manifold cavity generally opposite to said first fluid opening, said first curved surface having a first portion extending towards said first fluid opening and a second portion extending away from said fluid inlet and defining a concave curvature therebetween;
• wherein said first curved surface is a flow diverting surface for redirecting fluid flow between one of said first fluid opening or said second fluid opening and the other of said first fluid opening and said second fluid opening from said first or second direction to the other of said first or second direction for transmission to or from said first fluid channels of said heat exchanger.