0513 カチオン系界面活性剤水溶液による抵抗低減流れとその伝熱特性(OS5-3 非ニュートン流体の流動現象,オーガナイズドセッション)

概要

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Drag reduction caused by cationic surfactant solutions is considered to be an effective way to reduce the running cost in closed-loop district heating and cooling systems. Conversely, much research has pointed out that heat transfer reduction occurs simultaneously for drag reducing flows. In this study, heat transfer characteristics were measured for drag-reducing additives with two cationic surfactants (Ethoquad O/12 and Ethoquad O/13) using a test loop equipment and a practical air conditioning system. From the results, significant decreases of heat transfer coefficients were observed for drag-reducing additives, however, temperature difference between the inlet and outlet of the test section can not be decreased compared with that of water.
2009-11-06