Heat exchanger tubes with longitudinal ribs

Claim 1

A HEAT EXCHANGER FOR LIQUIDS AND GASES COMPRISING A SUBSTANTIALLY CYLINDRICAL CLOSED SHELL; A PLURALITY OF TUBES WITHIN SAID SHELL, DISPOSED IN GEOMETRICAL RELATIONSHIP RELATIVE TO EACH OTHER; INNER AND OUTER MEDIA FLOWING IN AND ABOUT SAID TUBES, RESPECTIVELY; INLET AND OUTLET MEANS FOR SAID MEDIA AT THE EXTREME ENDS OF SAID SHELL; AT LEAST ONE ROW OF SHORT, STRAIGHT, BLUNT-ENDED RIBS OF LIKE SIZE EQUIDISTANTLAY DISPOSED ON THE OUTER PERIPHERY OF SAID TUBES, INCLINED AT LIKE OBLIQUE ANGLES OF INCIDENCE RELATIVE TO SAID TUBES, POINTING TOWARD WACH OTHER AND FORMING A DEFINE GEOMETRICAL PATTERN WITH RIBS OF ADJOINING TUBES; NEIGHBORING TUBES CARRYING RIBS OF OPPOSING ANGLES OF INCIDENCE, THEREBY CAUSING A FLOW OF THE MEDIA PARALLEL TO THE AXIS OF SAID TUBES AND A CORKSCREW PITCH IN THE FLOW OF THE OUTER MEDIUM ABOUT THE CENTER OF SAID PATTERN, CROSSING INDIVIDUAL ROWS OF RIBS TANGENTIALLY TO A PLURALITY OF SAID TUBES.