Question

Match List-I with List-II and select the correct answer: List-I List-II A. Stokes' law 1. Strouhal number B. Bluff body 2. Creeping motion C. Streamline body 3. Pressure drag 4. Skin friction drag D. Karman Vortex Street (a) 2 A 3B 1C 4D (b) 3A 2B 40 ID (c) 2 A 3B 4C ID (d) 3A 2B IC 4D

Answer 1

page 1) ovestium Amsweg related to creeping (A) Stoke's Law Motion - Explanation! Stoke's law - Qt is a law, which deals the motion of a object in a vigeous medium under Art Ahem object full verdically downo creeping flow @ creeping motion ir algio known as Stokes flow. It is a motion which take place Under Low Reynold's number comditiom ie, when onestia force is small compared to vincour force

Page (2) is related to pressure (B) Bluff body drag. Ex Plamation There are two type of drag force. exit in viscous medium. ome is friction drag ( Responsible for attached flow) and other in Pressure drag (Responsible for Saperated flow). Pressure drag is related to corr-gec- tiom area of the body. - Whem drag force on a body in a viscour medium ir dominated by pressure drag them that body is called Bluff body, Pressure drag create Large eddies at high Reynoldes number due to which flow saperation take place around bluff body.

page-(3) () streamline body ir related to skim friction drag ex pranation Streamline body !- Whem viscaur fluid passes over a body them if there is mo flow saperation take place around surface of body, them that body is called Stream Line body- ie, In case of stream Lime body $Xoxo fluid will flow over body by touching through whole dengtha cause of two flow Saperation in Streamline body is dominating mates of friction drag of fluid. d) Karmam vortex street is related to strouhal Numbera Explanation

Page-(4) whom flow of fluid part over a buff body, them generates a XROOT vortex street in the wake regiom, this is known as karmam vartex Street In thig vortex street vibration of body in two direction take place, one in Parallel to the flow of fluid and other is transverse to the direction of fluid flow. vibration take place in tram averse direction in periodic in nature and it will oscillate with a dominatina frequemery, is known as Karman vortex shedding frequency. The nortex shadding frequency (Pw) is expressed in dimensionless number in known as strouhal Number 1st = fwP

Page-(5) 30, Comchuniam Lint (1) List ☆ Stoke's Law 2 creeping motion (B) Bluff body → (3) Pressure drag © Streamline body-> (9) Skim friction drag @) Karman vordex Å ) Strouhal. Street Number , می so, loption in → WYDAY, 183 le 2A, 3B, 4C, ID