UNIT -5. Dimensional Analysis. Model Analysis. Fundamental Dimensions Dimensional Homogeneity Method of analysis
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1 UNIT -5 Dimensional Analysis Fundamental Dimensions Dimensional Homogeneity Method of analysis Rayleigh Method Buckingham pi theorem Method Model Analysis Dimensionless parameters Similitude and model studies Distorted Models
2 DIMENSIONS
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4 Rayleigh Method
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6 Buckingham Π Theorem
7 Definition for Pi theorem
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9 Step 2 Step-3 Dimensional Analysis of Π 2 = D a 2. N b 2. ρ c 2. µ
10 Step 4
11 Problem 2 The pressure difference dp in a pipe of diameter D and length l due to viscous flow depends on the velocity V, µ viscosity and ρ density. Using Buckingham s theorem, obtain an expression for dp
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19 UNIT -5 Dimensional Analysis Model Analysis Dimensionless parameters Reynolds No, Froude No, Math No, Weber No & Euler No Similitude and model studies Geometric Similarity Kinematic Similarity Dynamic Similarity Distorted Models Scale ratios are different in vertical and horizontal directions
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21 Basic Terms Model A small scale replica of the actual structure or machine. Prototype The actual structure itself. Model Analysis An experimental method of findings solutions to complex flow problems.
22 Advantages of model analysis (related to civil engineering) Performance of the hydraulic structure can be predicted With the help of dimensional analysis, a relationship between the variables influencing flow problems interms of dimensionless numbers is obtained. This helps in conducting the test on the model. The most economical and safe design can be found out.
23 Similitude or Similarity Geometric Similarity L L p m b b Area - L 2 Volume - r p m D D Kinematic Similarity Dynamic Similarity V V p m p1 m1 v v L r p2 m2 v Here p represents prototype r 3 L r m represents model r represents ratio (scale ratio) i- inertia Force v- viscous Force g gravity force
24 Dimensionless Number Reynolds Number Froude Number Mach Number Euler Number Weber Number
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27 Scale Ratio
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33 Types of Model Undistorted Models Models that are geometrically similar to their prototypes (ie scale ratios for the all directions of linear dimensions in model and prototype are same) Distorted Models Models in which the different scale ratios are used for Models in which the different scale ratios are used for linear dimensions eg river model, harbours model. Scale Effect If complete similarity does not exist in model and its prototype there will be some discrepancy between the results obtained from model when compared with results in prototype. This effect is called scale effect.
34 Reynold s No problem Water is flowing through a pipe of diameter 30cm at a velocity of 4m/s. Find the velocity of oil flowing in another pipe of diameter 10cm, if the condition for dynamic similarity is satisfied. The viscosity of water and oil is given by 0.01 poise and poise. (sp. Gravity of oil = 0.8). Pipe 1 - Water Diameter d1 = 30 cm = 0.3 m Velocity v 1 = 4m/s Density ρ 1 = 1000 kg/m 3 µ 1 = N-s/m 2 Pipe 2 - Oil Diameter d 2 = 10 cm = 0.1 m Velocity v 2 =? m/s Density ρ 2 = 1000 x 0.8 kg/m 3 µ 2 = N-s/m 2 V D 1 V D 2 Find V 2 Ans: V 2 = 35.2 m/s
35 Problem related to Froude No A spillway model is to be built to a geometrically similar scale of 1/50 across a flume of 600 mm width. The prototype is 15m high and maximum head on it is expected to be 1.5m. (i) What height of model and what head on the model to be used (ii) If the flow over the model at a particular head is 12 litres per second, what flow per metre length of the prototype is expected? (iii) If the negative pressure in the model is 200 mm, what is the negative pressure in the prototype.
36 Model Scale = (1/50) 1 unit in model = 50 units in prototype (L p /L m ) = L r = 50 Width B m = 0.6m Height H m =?m Maxi head H m* =?m Q m = 12lit/sec -ve pr. h m = -0.2 m Prototype Width B p =? Height H p = 15m Maxi head H p* = 1.5m Q p =? m 3 /sec -ve pr. h p =?m Width of prototype = 0.6 * 50 = 30 m Height of model = 15/50 = 0.3m Maxi. Head of model = 1.5 / 50 = 0.03m = 3 cm Scale ratio for Q p /Q m = L r 2.5 = = So discharge in prototype Q p = 12 x 10-3 x = 212 m 3 /s Discharge per unit width q p = 212 / 30 = 7.07 m 3 /s -ve head on prototype = x 50 = - 10m
37 Model Testing In Partially Sub-merged Bodies Model- water V m = 12 m/s R m = 22N Prototype Air V p =? R p =? ν p = 13 x ν m (ν p / ν m ) = 13 ρ m =810ρ p (ρ p / ρ m ) = 1/810
38 Step 1 Find V p Using relation (VL/ν) p = (VL/ν) m Step 2: Find R p Using Relation (R / ρv 2 L 2 ) p = (R / ρv 2 L 2 ) m Ans: V p = 19.5 m/s Rp = 4.59N
39 Distorted Model Problem The discharge through the weir is 1.5 m 3 /s. Find the discharge through the model of the weir if the horizontal dimension scale is 1/50 and the vertical dimension scale is 1/10. Ans : Q m = 9.48 x 10-4 m 3 /s
40 Reference Bansal, R.K., Fluid Mechanics and Hydraulics Machines, 5th edition, Laxmi Publications Pvt. Ltd, New Delhi, 2008 Modi P.N and Seth "Hydraulics and Fluid Modi P.N and Seth "Hydraulics and Fluid Mechanics including Hydraulic Machines", Standard Book House New Delhi
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