Design and preliminary characterization of thermally-actuated pumps utilizing Marangoni and Leidenfrost effects Public

http://ir.library.oregonstate.edu/concern/honors_college_theses/1n79h642n

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  • Design and preliminarily characterization of two thermally-actuated pumps is presented in this thesis. The unique feature of both pumps is the presence of periodic asymmetrical structures on the channel walls. Two heat transfer effects are used with surface asymmetry to generate forces that drive the fluid in a preferential direction in these pumps. Specifically, a closed-channel pump utilizing the Leidenfrost effect on a ratchetlike asymmetrical topology and an open-channel pump utilizing the Marangoni effect on a ratchet-like asymmetric topology are investigated. The Leidenfrost pump design consists of a closed-channel with ratcheted sidewalls to propel the liquid. A key feature of the closed channel pump is a proposed concept for vapor removal. The vapor is extracted from the liquid channel to the surrounding atmosphere through separate variable-depth channels. The Marangoni pump design consists of an open-channel with a ratcheted bottom channel wall. Designs of the pump are debugged using proof-ofconcept testing to yield final pump designs. These final designs are then characterized based on mass flow rate for varying temperature inputs at a fixed pressure differential across the pump. The Leidenfrost pump shows a large variation in mass flow rate for lower Leidenfrost surface temperatures and more consistent flow rates at the high Leidenfrost temperature transition. The Marangoni pump yields conflicting data that may be improved upon with a more sensitive setup.
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