Numerical study of flow maldistribution in microchannels using fully resolved simulation Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7p88cj959

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  • This thesis addresses numerical simulation of flow maldistribution in microchannels. Microchannels are often associated with two phase-flows which can generate many problems such as plugging the channel or perturbing the flow. In this study we have used CFD and fully resolved technique to simulate what would happen in the case of bubbles modifying the flow in a 3 parallel microchannels structure. Such perturbations in the domain have a significant impact on the flow rate and on the flow distribution inside the geometry which can cause many disorders in terms of heat exchange for example, where a continuous mass flow rate is essential to be efficient. To restore a nominal flow, valves are added to the geometry at the entrance of each microchannel. These valves act separately and are operated by a controller to regulate and eventually modify the flow to flush the bubbles out. The controller makes its decision based on the mass flow rate data provided by sensors located at the entrance and exit of each channel. Based on this information the controller tries to equalize the mass flow rate in each channel. In the case of plugged channel, this means that most of the flow will be forced through the plugged channel to push the bubble out. These valves have an impact on the flow distribution inside the channel but allow an active and accurate control over the flow in the geometry. In this work the scheme used to solve the two-phase flow problem is crucial. Since the simulation is dealing with both freely (bubbles) and forced (valves) moving particles over the geometry, the formulation has to be able to handle this phenomenon as well as the flow itself in a reasonable amount of time. A fictitious domain technique, allowing high density ratio between fluid and particle, has been used. This new approach has been extensively tested and significantly improved for this application.
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  • description.provenance : Submitted by Mathieu Martin (martmath@onid.orst.edu) on 2009-03-21T18:15:52Z No. of bitstreams: 1 main.pdf: 31092581 bytes, checksum: fca95cbe9c5373d4d7615952ecb3869c (MD5)
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