Disclosed herein is a an internal surface generator (300) comprising an inlet sub-element (302) comprising a plurality of inlet ports (302A-302D); an outlet sub-element (306) comprising outlet ports (306A-306D) that are equal in number to the inlet ports; and an intermediate sub-element (304) comprising non-linear passages (304A-304D) that are equal in number to the inlet ports or the outlet ports; where the intermediate sub-element contacts the inlet sub-element and the outlet sub-element and is operative to transport a fluid from the inlet ports to the outlet ports.