User: stanzaa37

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stanzaa370
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Posts by stanzaa37

<prev • 919 results • page 1 of 92 • next >
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Page: Scale ratios for distorted models
... As mentioned above two different scale ratios one for horizontal dimensions and other for vertical dimensions are taken for distorted models Let Lr$_{H}$ = scale ratio for horizontal dimensions $\frac{Lp}{Lm}=\frac{Bp}{Bm}$ Bp=Linear horizontal dimension (prototype) Bm=Linear horizontal dimensio ...
page ahbook written 16 days ago by stanzaa370
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Page: Classification of models
... **a) Undistorted models:-** - Those models which are geometrically similar to their prototype or in other words if the scale ratio for linear dimensions of model and its prototype is same the model is called as undistorted model - The behaviour of the prototype can be easily predicted from ...
page ahbook written 16 days ago by stanzaa370
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Page: 7.2 m height and 15m long spillway discharges 94$^{3}$/s discharge under a head of 20m . If a 1:9 score model of spillway is constructed determine model dimensions head over spillway model, model
... **discharge. If model experiences a force of 7500N (764.53kbf). determine force on the prototype** 1) For prototype Height hp=7.2m 2) For prototype length, Lp=15m 3) For prototype Discharge, Qp=94m$^{3}/s$ 4) For prototype Head, Hp=2.0m size of model =$\frac{1}{9]}$ of the size of prototype L ...
page ahbook written 16 days ago by stanzaa370
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Page: In line 20model stilling basin the height of hydraulic jump in model is observed to 0.2n meter what height of hydraulic jump prototype.If energy dissipated model$\frac{1}{10}$ KN what corresponding
... **value in prototype?** 1) Liner scale ratio LR=20 2) Height of hydraulic jump in mode = hm=0.20m 3) Energy dissipated in model , Pm=$\frac{1}{10}$kN Step No (1) $\frac{hp}{hm}$=Lr =20 hp=hrn$\times$20 =0.20$\times$20 [hp=4m] Step No (2) Energy dissipated in prototype = FP $\frac{Pp}{Pm ...
page ahbook written 16 days ago by stanzaa370
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Page: In 1 in two model of spillway the velocity and discharge are 2m/s and 2.5m$^{3}$s find the corresponding velocity and discharge in prototype
... scale ratio of length Lr=40 velocity in model Vm=2m/s Discharge in model $\phi=2.4m^{3}s$ Let 'vp' and $\phi p$ be the velocity and discharge in prototype Step No 1) $\frac{vp}{vm}=\sqrt{Lr}$ =$\sqrt{40}$ Vp=Vm$\times \sqrt{40}$ =2$\times \sqrt{40}$ [Vp=12.65m/s] Step 2) $\frac{\phi}{\phi ...
page ahbook written 16 days ago by stanzaa370
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Page: Fraudes Model law
... 1) It is the law in which the models are based on fraude number which means for dynamic similarity between model and prototype the fraude number for both of them should be equal 2) When the gravity force is my predominant force which controls the flow in addition to the force of inertia fraude m ...
page ahbook written 17 days ago by stanzaa370
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Page: Ratio of lenght of sub marine and its model is 3:1. The speed of sub marine is 10m/s. The model to be tested in wind tunnel. Fidn speed of air wind tunnel. Also determine the ratio of drag resistance
... **between the model and its prototype . Take the value of kinematic viscosities for sea water and air as 0.012 stokes and 0.016 stokes respectively. The density for sea water and air is given as 1030 kg/m$^{3}$ and 1.24/m$^{3}$ respectively** For prototype speed , V$_{p}$=10m/s Fluid sea water ...
page ahbook written 17 days ago by stanzaa370
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Page: Model Laws or Similarity laws
... 1) For dynamic similarity between the model and the prototype the ratio of the corresponding forces acting at the corresponding points in model and prototype should be equal 2) The ratio of the forces are dimensionless numbers 3) That means, for dynamic similarity between the model and prototype ...
page ahbook written 17 days ago by stanzaa370
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Page: Dimensioless Numbers
... 1) " The numbers which are obtained by dividing the inertia force by viscous force or gravity force or pressure force or surface tension force or elastic force are called as Dimensionless Numbers" 2) As this is a ratio of one force to the other force it will be a dimensionless number 3) These Dim ...
page ahbook written 17 days ago by stanzaa370
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Page: Derive the basis of dimensional analysis suitable parameters to present the thrust developed by a propeller Assume that thrust 'p' depends upon angular velocity 'w' speed of advance 'v' diameter'D'
... **dynamic viscosity '$\mu$ mass density'p' elasticity of fluid medium which can be denoted by the speed of sound in the medium 'c'** Thrust 'P' is a function of w,v,D,$\mu$,p,c P=f(w,v,D, $\mu$,p,c) or $f_{1}$=(P,w,V,D,$\mu$,p,c)=0.....(1) Total variables=7 writing dimensions of each variable, ...
page ahbook written 18 days ago by stanzaa370

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