A heat exchanger, comprising: a first manifold defining a first fluid inlet; a second manifold defining a second fluid inlet; and a lattice cell body having: a first set of flow passages in fluid communication with the first manifold, and where the first set of flow passages include a set of first furcated flow passages extending from the first fluid inlet; and a second set of flow passages in fluid communication with the second manifold, and where the second set of flow passages include a set of second furcated flow passages extending from the second fluid inlet, wherein at least a portion of the first furcated flow passages are intertwined with at least a portion of the second furcated flow passages; characterized in that: the set of first furcated flow passages converge to a first interconnecting passage that forms a hyperbolic shape and diverges into another set of first furcated flow passages, wherein the convergence to and the divergence from the first interconnecting passage of the said sets of first furcated flow passages defines a first saddle point; and the set of second furcated flow passages converge to a second interconnecting passage that forms a hyperbolic shape and diverges into another set of second furcated flow passages. a first manifold defining a first fluid inlet; a second manifold defining a second fluid inlet; and a lattice cell body having: a first set of flow passages in fluid communication with the first manifold, and where the first set of flow passages include a set of first furcated flow passages extending from the first fluid inlet; and a second set of flow passages in fluid communication with the second manifold, and where the second set of flow passages include a set of second furcated flow passages extending from the second fluid inlet, a first set of flow passages in fluid communication with the first manifold, and where the first set of flow passages include a set of first furcated flow passages extending from the first fluid inlet; and a second set of flow passages in fluid communication with the second manifold, and where the second set of flow passages include a set of second furcated flow passages extending from the second fluid inlet, wherein at least a portion of the first furcated flow passages are intertwined with at least a portion of the second furcated flow passages; characterized in that: the set of first furcated flow passages converge to a first interconnecting passage that forms a hyperbolic shape and diverges into another set of first furcated flow passages, wherein the convergence to and the divergence from the first interconnecting passage of the said sets of first furcated flow passages defines a first saddle point; and the set of second furcated flow passages converge to a second interconnecting passage that forms a hyperbolic shape and diverges into another set of second furcated flow passages. the set of first furcated flow passages converge to a first interconnecting passage that forms a hyperbolic shape and diverges into another set of first furcated flow passages, wherein the convergence to and the divergence from the first interconnecting passage of the said sets of first furcated flow passages defines a first saddle point; and the set of second furcated flow passages converge to a second interconnecting passage that forms a hyperbolic shape and diverges into another set of second furcated flow passages.