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"Simulations of valveless pumping using the Immersed Boundary Method: Parameter studies."

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Speaker: Eunok Jung, Oak Ridge National Laboratory
Location: 693 Kerr
Start time: Wed, Jan 24 2001, 4:10PM

Flows driven by pumping without valves are observed, motivated by biomedical applications: cardiopulmonary resuscitation (CPR) for the thoracic pump model and the human fetus before the development of the heart valves. The direction and magnitude of the fluid inside a loop of tubing which consists of (almost) rigid and flexible parts are investigated when the boundary of one end of the flexible segment is forced periodically in time. Despite the absence of valves, a net flow around the loop is generated by a valveless mechanism in a circulatory system. A startling result, "the direction and magnitude of the flow depend upon the parameters, such as frequency, amplitude, compression duration, and the fraction of the flexible boundary being compressed", is discovered.