Abstract: A cooling system for the internal combustion engine of a motorcycle includes a radiator and means defining air passages each having a forwardly facing inlet opening disposed respectively on the opposite sides of the motorcycle's front fork. Each air passage extends rearwardly from the inlet opening to an outlet which opens into a plenum chamber disposed adjacent the radiator. The cross-sectional area of each passage increases gradually between its inlet and outlet ends. An exhaust duct is connected to the plenum chamber and the radiator is disposed between the plenum chamber and the exhaust duct.

Abstract: A heat exchanger includes ribs mounted transversely of the axis of the tube and uniformly spaced therealong. Each rib includes a plate with corrugations oriented along the flow of the fluid washing the tube. The ribs adjoin one another, their corrugations having lateral slits, the wall portions between these slits being offset relative to one another to provide passages for the flow of the fluid.Owing to this structure the thickness of the boundary layer at each one of said portions is reduced, and the effectiveness of heat exchange is stepped up. Furthermore, a heat exchanger with the disclosed ribs is considerably more compact and needs less metal for its construction, as compared with known heat exchangers.

Abstract: A heat transfer device comprising a spiral brush insert within a tube of rmally conductive material. The brush insert has a diameter slightly larger than the inside diameter of the tube and is inserted from the downstream end of the tube so that the tips of the brush deflect to form a friction fit for imbedding within the tube wall and thereby prevent movement of the brush insert during normal fluid flow in the device.

Abstract: In a heat exchanger comprising a plurality of first heat-transfer elements (A) for a fluid of higher temperature and second heat-transfer elements (B) for a fluid of lower temperature joined alternately and adjacently and a suitable number of appropriately shaped fins disposed within said elements and wherein the heat exchange is performed between the fluid (a) of higher temperature and the fluid (b) of lower temperature and at least the fluid (a) is changed in phase during the heat exchange, the improvement of providing such a heat exchanger with the ability to rectify the condensate from the fluid (a) and to recover the rectified liquid, wherein the fins in the lower part of the element (A) are so arranged that the fluid (a) entering from a port into the element (A) flows upwards smoothly with contact with the liquid condensed from the fluid (a) at the upper part of the element (A), which flows down through the heat exchanger.

Abstract: A heat exchanger is disclosed which is operated between a source and a sink comprising a frame journaling a rotor relative to the frame which rotor has a first and second rotor end. Heat transfer means which may include a fluid conducting conduit or an electrical heating path forms a conduction path between the first and second rotor ends. The conduction path extends back and forth between a region proximate a first rotor end and a region proximate a second rotor end a plurality of times. The conduction path is connected to either the source or the sink to provide energy transfer therebetween. Means are provided for rotating the rotor for transferring heat between the conduction path and the other of the source and the sink. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.