A stream of time-ordered data, such as a movie, is divided into multiple fragments of equal length, which are repetitively transmitted at different respective repetition rates. The cooling apparatus and direct impingement cooling module include a manifold structure and a jet orifice plate for injecting coolant onto a surface to be cooled. A carriage is disposed within a cavity of the wall and is displaceable relative to the collar. The chamber along the flow direction shows different pressures, and two phase fluid flows automatically due to the pressure difference.