Publicado 6 números por año
ISSN Imprimir: 2152-5102
ISSN En Línea: 2152-5110
Indexed in
UTILIZING MICROCAVITY SHAPES FOR DRAG REDUCTION IN MICROCHANNELS
SINOPSIS
Introduction of surface microtexturing has led to several possibilities of drag reduction in microchannels. Major contributions in this field are the prevention of Cassie−Wenzel state transition and the utilization of Cassie-Baxter state for drag reduction in microchannels. In the present numerical work, the drag reduction ability of microcavity assisted microchannels under Wenzel state, which has gained less attention from researchers, is reported on. In order to present the significance of utilization of microcavities in microchannels, ten different microcavity shapes are considered for analysis. Moreover, the effect of geometrical parameters related to microchannels such as hydraulic diameter and cross-sectional shapes on Poiseuille number is presented to identify possible drag reduction ability. Five cross-sectional shapes are considered in this work. Results of the investigation revealed the significant drag reduction ability of the microchannel with triangular cross-section and square cavity shape. Moreover, the present work is extended by considering the triangular cross-sectioned microchannel for geometrical optimization such as change in hydraulic diameter, different triangular cross-sectional shapes, and channel length. In addition, the cavity geometry is also considered for the analysis, and the best values in assistance with triangular cross-sectioned microchannel are presented. The maximum drag reductions of 73% and 64% are obtained in comparison with the smooth one at the Reynolds numbers of 10 and 120, respectively. Results of the present work provide new insight to researchers in this field to consider microcavity assisted microchannels for possible drag reduction under Wenzel state.
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