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单选题 In Reynold experiment, the criterion that determines the whether the flow is laminar or turbulent is . ( )
学科：Fluid Dynamics
时间：2023-05-08 17:45:10
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题目1单选题
The hydraulic radius <img src="https://tihai-oss-cloud.itihey.com/img/26286b6ede6e29c221a8c9207d6e841f.png"> is a convenient means for expressing the shape as well as the size of a conduit, so the relationship between diameter D and <img src="https://tihai-oss-cloud.itihey.com/img/d47efbd46bbdd5945ef21752fd87bf27.png"> can be expresses as . ( )A. <img src="https://tihai-oss-cloud.itihey.com/img/36336196eecf5de2dc892111d6941d61.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/f26834866a49472e261f3676779c88ba.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/b7427bce9e056b07426d32186287fc5d.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/8623dbff69305db5394ca5f7ced23105.png">
题目2单选题
In the structure of the turbulence, turbulent is inhibited so that a laminar-like sublayer occurs immediately next to the wall. This sublayer is called . ( )A. laminar sublayerB. viscous sublayerC. turbulent sublayerD. inviscid sublayer
题目3判断题
If the surface roughness projections are large enough to protrude right through the transition layer. The resulting flow is completely turbulent, known as fully rough(-pipe) flow ( )A. 对B. 错
题目4单选题
In Reynold experiment, the criterion that determines the whether the flow is laminar or turbulent is . ( )A. Reynolds numberB. Froud numberC. Euler numberD. Mach number
题目5单选题
The hydraulic radius <img src="https://tihai-oss-cloud.itihey.com/img/11797481328865701760077cb53ff95e.png"> is defined as the expression about the cross-sectional area of the flowing fluid A, and the wetted perimeter <img src="https://tihai-oss-cloud.itihey.com/img/99ffaf759e67a8a0501b42a076350a17.png"> . so <img src="https://tihai-oss-cloud.itihey.com/img/1d1d074f451ec0f8baa72ab9daf30223.png"> . ( )A. <img src="https://tihai-oss-cloud.itihey.com/img/01c11ad156b3384c1fc9bd5e5c7a8da9.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/b9ee8c437dd9334d8954e16c07e53d1d.png">=A P 2C. <img src="https://tihai-oss-cloud.itihey.com/img/d26ee6b349ef990cc2fdfe680c545d7b.png">=A 2PD. <img src="https://tihai-oss-cloud.itihey.com/img/91d2c4d309899ff2f1fa2a988fb363fb.png">=A/P
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