[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fBS8aP35XaY2hfWQx1iWRV9ZWLNaY32T-t8OLu4UIYRA":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":18,"related":19,"source":23,"type":24},[],"2023-05-09 01:45:10",923367201,[8,9,10,11],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F36336196eecf5de2dc892111d6941d61.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Ff26834866a49472e261f3676779c88ba.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb7427bce9e056b07426d32186287fc5d.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F8623dbff69305db5394ca5f7ced23105.png\">",{"courseId":13,"courseImg":14,"courseName":15,"workId":16,"workName":17},"1000071104","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F2dc8988862237d40c4fef0796424edee.jpg","Fluid Dynamics","45792512","第七章单元测试","The hydraulic radius \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F26286b6ede6e29c221a8c9207d6e841f.png\"> is a convenient means for expressing the shape as well as the size of a conduit, so the relationship between diameter D and \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd47efbd46bbdd5945ef21752fd87bf27.png\"> can be expresses as . ( )",[20,25,34,42,51],{"answer":21,"createTime":5,"id":6,"options":22,"question":18,"source":23,"type":24},[],[8,9,10,11],"v2",0,{"answer":26,"createTime":5,"id":27,"options":28,"question":33,"source":23,"type":24},[],923367202,[29,30,31,32],"laminar sublayer","viscous sublayer","turbulent sublayer","inviscid sublayer","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 . ( )",{"answer":35,"createTime":5,"id":36,"options":37,"question":40,"source":23,"type":41},[],923367203,[38,39],"对","错","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 ( )",3,{"answer":43,"createTime":5,"id":44,"options":45,"question":50,"source":23,"type":24},[],923367206,[46,47,48,49],"Reynolds number","Froud number","Euler number","Mach number","In Reynold experiment, the criterion that determines the whether the flow is laminar or turbulent is . ( )",{"answer":52,"createTime":5,"id":53,"options":54,"question":59,"source":23,"type":24},[],923367207,[55,56,57,58],"\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F01c11ad156b3384c1fc9bd5e5c7a8da9.png\">","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fb9ee8c437dd9334d8954e16c07e53d1d.png\">=A P 2","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd26ee6b349ef990cc2fdfe680c545d7b.png\">=A 2P","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F91d2c4d309899ff2f1fa2a988fb363fb.png\">=A\u002FP","The hydraulic radius \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F11797481328865701760077cb53ff95e.png\"> is defined as the expression about the cross-sectional area of the flowing fluid A, and the wetted perimeter \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F99ffaf759e67a8a0501b42a076350a17.png\"> . so \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1d1d074f451ec0f8baa72ab9daf30223.png\"> . ( )"]