Enhancing Heat Transfer of Drag Reducing Surfactant Solutions with Static Mixers
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. William G. Lowrie Department of Chemical and Biomolecular Engineering Honors Theses; 2019
At very low concentrations (in parts per million or ppm), surfactant drag reducing solutions have been shown to significantly reduce the pressure drop in turbulent flow systems. These solutions are of interest in industry because they can lower the pumping energy requirements and subsequently, costs, in recirculating flow systems. Unfortunately, drag reduction (DR) is coupled with heat transfer reduction (HTR), which is undesirable for commercial applications like district heating and cooling (DHC) systems because it renders the technology uneconomical. Thus, many methods, including ultrasonication and photosensitive counterions, have been developed and used to improve heat transfer in surfactant DR solutions. Many of these methods are complicated, expensive to implement, require high energy inputs, or result in high pressure drop penalties. Static mixers, however, are simple and easily installed into heat exchangers, so manufacturers can retrofit existing tubes. In this study, four static mixers were constructed by attaching three-dimensional printed elements with 45 degree pitch onto 48-inch carbon fiber rods with the following designs: one blade, two blades spaced one-fourth and three-fourth of the way of the heat exchanger tube, two blades spaced one-third and two-third of the way of the tube, and three blades spaced evenly. These showed significant improvement of heat transfer when tested with varying positions in the heat exchanger in the recirculating flow system.
Academic Major: Chemical Engineering
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