Expanded metal baffle

A guarded machine is an open machine in which all openings giving direct access to live metal or rotating parts (except smooth rotating surfaces) are limited in size by the structural parts or by screens, baffles, grilles, expanded metal, or other means to prevent accidental contact with hazardous parts. 

Heat Transfer Enhancements Heat transfer enhancements increase the film heat transfer coefficient, thus improving U and consequently heat tfansfer in the exchanger. In the case of the ubiquitous ST heat exchanger, heat transfer enhancement can be achieved on the shell and/or tube sides as required. Tube-side enhancements help in improving the film heat transfer coefficient on the tube side, and are useful if the exchanger involved has lower film heat transfer coefficient on the tube side. Tube-side enhancements include, but are not limited to, twisted-tape inserts, coiled-wire inserts and internal fins. Similarly, shell-side enhancements are used to improve the heat transfer coefficient on the shell side. They include helical baffles, external fins and Expanded Metal (EM) baffles. More details on heat transfer enhancements are available in Pan et al. (2013). 

Cross-flow tray made of expanded-metal segments. Vapor outlet aperture — vapor blow direction — are shifted by 90°. To increase the active surface of the tray and to avoid entrainment of liquid baffle expanded-metal deflectors are mounted in a sharp angle against the vapor flow direction. 

As automakers continuously refine their cars, trucks and SUVs, design capabilities and material science technologies of acoustic baffles become an engineering challenge to fulfill these refinements. Early part designs were cumbersome, bulky and not very efficient in overall performance. A full layer of expanding material was often assembled onto a metal or plastic bracket that functioned as a shelf to span the cavity section to be sealed. These parts were often welded or clipped to the body structure with plastic pins. 

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