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The invention provides an improved heat exchanger and/or fluid mixing means which comprises a bonded stack of plates, the stack comprising at least one group of main perforated plates, wherein at least two adjacent plates of the group of main perforated plates have their perforations aligned in rows

The invention provides an improved heat exchanger and/or fluid mixing means which comprises a bonded stack of plates, the stack comprising at least one group of main perforated plates, wherein at least two adjacent plates of the group of main perforated plates have their perforations aligned in rows with continuous ribs between adjacent rows, and the adjacent plates are aligned whereby the rows of perforations in one plate overlap in the direction of the rows with the rows of perforations of an adjacent plate and the ribs of adjacent plates lie in correspondence with each other to provide discrete fluid channels extending across the plates, a channel corresponding to each row of perforations, the channels together forming one or more fluid passageways across the plates and the passageway(s) in the group of main perforated plates being separated from passageway(s) in any adjacent group of perforated plates by an intervening plate.

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1. A fluid flow device comprising a bonded stack of circular plates, the stack comprising at least one group of perforated main plates each group of perforated main plates comprising at least two adjacent main plates having perforations aligned in radially extending rows with radially extending ribs

1. A fluid flow device comprising a bonded stack of circular plates, the stack comprising at least one group of perforated main plates each group of perforated main plates comprising at least two adjacent main plates having perforations aligned in radially extending rows with radially extending ribs between adjacent rows, the rows of perforations in one main plate overlapping the rows of perforations of an adjacent main plate and the ribs of adjacent main plates lying in correspondence with each other to define discrete fluid flow channels extending radially across the plates, the channels together forming one or more radially extending fluid flow passageways, the stack further comprising one or more intervening plates disposed on one or both sides of a first group of perforated main plates. 2. A device according to claim 1, wherein a second group of perforated main plates is separated from the first group of perforated main plates by one or more intervening plates so that one or more fluid passageways in the second group of perforated main plates are separated from one or more fluid passageways in the first group of perforated main plates by one or more intervening plates to define separate passageways on each side of the one or more intervening plates.3. A device according to claim 2, wherein each intervening plate between the first and second groups of plates is perforated to allow fluid flow from a passageway on one side of the one or more intervening plates between the first and second groups of plates into a passageway on the other side thereof.4. A device according to claim 1 orclaim 3, wherein each passageway has an inlet and an outlet, the device further comprising a respective integral tank in communication with the inlet of each passageway and a respective integral tank in communication with the outlet of each passageway.5. A device according to claim 4, wherein each plate has a plurality of loops integrally formed on the perimeter of the plate, the loops on each plate co-operating with the loops on adjacent plates to form said integral inlet and outlet tanks.6. A device according to claim 4, wherein each main plate has a plurality of alternate radially extending first bars that extend inwardly from a perimeter of each main plate toward the center of each main plate and a plurality of alternate radially extending second bars that extend outwardly from the center of each main plate toward the periphery of each main plate, said first bars stopping short of the center and the second bars stopping short of the perimeter, the pluralities of first and second bars being constructed and arranged to divide the continuous fluid passageway extending from the inlet to the outlet into a plurality of segments spaced circumferentially about the center of each group of main plates, each segment including one or more radially extending fluid passageways disposed between a pair of radially extending bars.7. A device according to claim 6, wherein each group of main plates has a dividing bar that extends continuously from the center of the group of plates to the perimeter of the group of plates, the dividing bar being constructed and arranged to prevent fluid from flowing directly between a segment immediately adjacent the fluid inlet and a segment immediately adjacent the fluid outlet of each group of main plates.8. A device according to claim 1, wherein one or more fluid passageways in the first group of main perforated plates is defined in part by an intervening plate adjacent a side of the first group of main perforated plates.