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| Numerical Simulation Methods of MicroBubbles Drag Reduction and Scale Effect
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| FU Huipinga,b,LI Jieb |
| (a. Collaborative Innovation Center for Advanced Ship and DeepSea Exploration; b. School of
Naval Architecture, Ocean and Civil Engineering, State Key Laboratory of Ocean Engineering,
Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Abstract： Based on the mixture model, Eulertwofluid model and population balance model, bubble drag reduction using gas injection for the flow over a twodimension flat plate was numerically simulated. Effects of bubble size and gas injection rate on bubble drag reduction and the scale effect were analyzed. The results show that the decrease of bubble size can increase drag reduction which increases along with the increase of gas injection rates within a certain range. When the gas injection rate is too low or too high, drag reduction would decrease. The results obtained by using the population balance model are closer to the experimental data than those obtained by using other models. If Reynolds number increases due to the increase of the plate size, the drag reduction level would decrease.
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Received: 02 March 2015
Published: 29 February 2016
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