Porous laminated sheet

Claim 1

A laminated porous metal sheet adapted for convection cooling of the sheet by gas flow through the sheet and to provide a shielding turbulent gas flow over a front face of the sheet exposed to a source of heat, the sheet comprising a front layer and a rear layer, the two said layers being in abutting face-to-face relation and being bonded together; the front layer having an outer face constituting the front face of the sheet and an inner face abutting the rear layer, having a multiplicity of rows of separate, short grooves in the inner face with the rows extending generally parallel and with the grooves elongated in the direction of the rows, adjacent groups of four grooves being arranged in a rectangular pattern, each groove in said pattern having an inlet into one end of each groove and an outlet hole extending from the other end of each groove through the outer face; the rear layer having an outer face constituting the rear face of the sheet and an inner face abutting the front layer and having a multiplicity of slots in the inner face, one of said slots communicating with two said inlets disposed in grooves of each of said rectangular pattern and others of said slots communicating with inlets of the remaining grooves in said rectangular pattern and with inlets of grooves formed in adjacent ones of said rectangular patterns to spread coolant flow between said front and rear layers; and the rear layer defining an aperture leading from its outer face into each said slot; so that gas flowing through the sheet from the rear face to the front face is fed through the said apertures, slots, inlets, grooves, and outlet holes, and is discharged from the outlet holes of adjacent rows with substantial inclination to a normal to the front face of the sheet.