Basics of Fluid Mechanics, 2014a

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1.7. SURFACE TENSION 39 Equation (1.64) is a first order differential equation that can be solved by variables separation 13 . Equation (1.64) can be rearranged to be ( 1+ḣ2) 1/2 1 = (1.65) 1 − h2 2 Lp Squaring both sides and moving the one to the right side yields ( ) 2 ḣ 2 1 = − 1 (1.66) 1 − h2 2 Lp The last stage of the separation is taking the square root of both sides to be √ √√√ ( ) 2 ḣ = dh dx = 1 − 1 (1.67) 1 − h2 2 Lp or dh ( ) = dx (1.68) 2 √ 1 − 1 1 − h2 2 Lp Equation (1.68) can be integrated to yield ⎧ - dh ( ) 2 √ 1 ⎪⎭ − 1 1 − h2 2 Lp - = x + constant (1.69) The constant is determined by the boundary condition at x = 0. For example if h(x − 0) = h 0 then constant = h 0 . This equation is studied extensively in classes on surface tension. Furthermore, this equation describes the dimensionless parameter that affects this phenomenon and this parameter will be studied in Chapter ?. This book is introductory, therefore this discussion on surface tension equation will be limited. 1.7.1.1 Capillarity The capillary forces referred to the fact that surface tension causes liquid to rise or penetrate into area (volume), otherwise it will not be there. It can be shown that the height that the liquid raised in a tube due to the surface tension is h = 2 σ cos β (1.70) g Δρr Where Δρ is the difference of liquid density to the gas density and r is the radius of tube. 13 This equation has an analytical solution which is x = Lp p 4 − (h/Lp) 2 − Lp acosh(2 Lp/h) + constant where Lp is the Laplace constant. Shamefully, this author doesn’t know how to show it in a two lines derivations.
40 CHAPTER 1. INTRODUCTION TO FLUID MECHANICS But this simplistic equation is unusable and useless unless the contact angle (assuming that the contact angel is constant or a repressive average can be found or provided or can be measured) is given. However, in reality there is no readily information for contact angle 14 and therefore this equation is useful to show the treads. The maximum that the contact angle can be obtained in equation (1.70) when β =0and thus cos β =1. This angle is obtained when a perfect half a sphere shape exist of the liquid surface. In that case equation (1.70) becomes 0 h actual working range { Theory Fig. -1.24. The raising height as a function of the radii. R h max = 2 σ g Δρr (1.71) Figure 1.25 exhibits the height as a function of the Capilary Height radius of the tube. The height based on equation 1.2 Distilled water [23 C] (1.71) is shown in Figure 1.24 as blue line. The actual 1.0 Mercury [25 C] Equation 0.8 height is shown in the red line. Equation (1.71) provides reasonable results only in a certain range. For 0.4 0.6 0.2 a small tube radius, equation (1.59) proved better 0.0 results because the curve approaches hemispherical 0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 Radii [cm] sphere (small gravity effect). For large radii equation (1.59) approaches the strait line (the liquid line) May 29, 2008 strong gravity effect. On the other hand, for extremely small radii equation (1.71) indicates that the Fig. -1.25. The raising height as a function of the radius. high height which indicates a negative pressure. The liquid at a certain pressure will be vaporized and will breakdown the model upon this equation was constructed. Furthermore, the small scale indicates that the simplistic and continuous approach is not appropriate and a different model is needed. The conclusion of this discussion are shown in Figure 1.24. The actual dimension for many liquids (even water) is about 1-5 [mm]. The discussion above was referred to “wetting” contact angle. The depression of the liquid occurs in a “negative” contact angle similarly to “wetting.” The depression height, h is similar to equation (1.71) with a minus sign. However, the gravity is working against the surface tension and reducing the range and quality of the predictions of equation (1.71). The measurements of the height of distilled water and mercury are presented in Figure 1.25. The experimental results of these materials are with agreement with the discussion above. The surface tension of a selected material is given in Table 1.7. In conclusion, the surface tension issue is important only in case where the radius is very small and gravity is negligible. The surface tension depends on the two materials or mediums that it separates. [cm] Height 14 Actually, there are information about the contact angle. However, that information conflict each other and no real information is available see Table 1.6.
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Basics of Fluid Mechanics Genick Ba
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iii ‘We are like dwarfs sitting o
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CONTENTS Nomenclature xxiii GNU Fre
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CONTENTS vii 4 Fluids Statics 69 4.
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CONTENTS ix 9.2.1 Construction of t
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CONTENTS xi 12.5 The Working Equati
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LIST OF FIGURES 1.1 Diagram to expl
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LIST OF FIGURES xv 4.32 Polynomial
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LIST OF FIGURES xvii (a) Streamline
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LIST OF FIGURES xix 12.22The angles
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LIST OF TABLES 1 Books Under Potto
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NOMENCLATURE ¯R Universal gas cons
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LIST OF TABLES xxv w Work per unit
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The Book Change Log Version 0.3.4.0
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LIST OF TABLES xxix ˆ Add discussi
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LIST OF TABLES xxxi ˆ Add the open
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Notice of Copyright For This Docume
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GNU FREE DOCUMENTATION LICENSE xxxv
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GNU FREE DOCUMENTATION LICENSE xxxv
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GNU FREE DOCUMENTATION LICENSE 7. A
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CONTRIBUTOR LIST How to contribute
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CREDITS Typo corrections and other
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About This Author Genick Bar-Meir i
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Prologue For The POTTO Project This
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CREDITS xlix process. Someone has t
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Page 54 and 55: Prologue For This Book Version 0.3.
Page 56 and 57: VERSION 0.1 APRIL 22, 2008 lv and t
Page 58 and 59: How This Book Was Written This book
Page 60 and 61: Preface "In the beginning, the POTT
Page 62 and 63: To Do List and Road Map This book i
Page 64 and 65: CHAPTER 1 Introduction to Fluid Mec
Page 66 and 67: 1.2. BRIEF HISTORY 3 lay is one of
Page 68 and 69: 1.3. KINDS OF FLUIDS 5 results. The
Page 70 and 71: 1.4. SHEAR STRESS 7 For cases where
Page 72 and 73: 1.5. VISCOSITYVISCOSITY 9 The veloc
Page 74 and 75: 1.5. VISCOSITYVISCOSITY 11 always p
Page 76 and 77: 2.5 2.0 1.5 1.0 0.5 0 100 200 300 4
Page 78 and 79: 1.5. VISCOSITYVISCOSITY 15 Chemical
Page 80 and 81: 1.5. VISCOSITYVISCOSITY 17 2 Reduce
Page 82 and 83: 1.5. VISCOSITYVISCOSITY 19 In very
Page 84 and 85: 1.6. FLUID PROPERTIES 21 The total
Page 86 and 87: 1.6. FLUID PROPERTIES 23 straight.
Page 88 and 89: 1.6. FLUID PROPERTIES 25 Table -1.5
Page 90 and 91: 1.6. FLUID PROPERTIES 27 Two layers
Page 92 and 93: 1.6. FLUID PROPERTIES 29 1.6.2.1 Bu
Page 94 and 95: 1.7. SURFACE TENSION 31 terials. Th
Page 96 and 97: 1.7. SURFACE TENSION 33 or Or after
Page 98 and 99: 1.7. SURFACE TENSION 35 The maximum
Page 100 and 101: 1.7. SURFACE TENSION 37 kipenii,”
Page 104 and 105: 1.7. SURFACE TENSION 41 Example 1.1
Page 106 and 107: 1.7. SURFACE TENSION 43 Table -1.7.
Page 108 and 109: CHAPTER 2 Review of Thermodynamics
Page 110 and 111: 2.1. BASIC DEFINITIONS 47 Since the
Page 112 and 113: 2.1. BASIC DEFINITIONS 49 when the
Page 114 and 115: 2.1. BASIC DEFINITIONS 51 Utilizing
Page 116 and 117: CHAPTER 3 Review of Mechanics This
Page 118 and 119: 3.2. CENTER OF MASS 55 3.2 Center o
Page 120 and 121: 3.3. MOMENT OF INERTIA 57 The momen
Page 122 and 123: 3.3. MOMENT OF INERTIA 59 Equation
Page 124 and 125: 3.3. MOMENT OF INERTIA 61 Example 3
Page 126 and 127: 3.3. MOMENT OF INERTIA 63 or x (1 a
Page 128 and 129: 3.5. ANGULAR MOMENTUM AND TORQUE 65
Page 130 and 131: 3.5. ANGULAR MOMENTUM AND TORQUE 67
Page 132 and 133: CHAPTER 4 Fluids Statics 4.1 Introd
Page 134 and 135: 4.3. PRESSURE AND DENSITY IN A GRAV
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4.3. PRESSURE AND DENSITY IN A GRAV
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4.3. PRESSURE AND DENSITY IN A GRAV
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4.4. FLUID IN A ACCELERATED SYSTEM
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4.5. FLUID FORCES ON SURFACES 101 T
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4.5. FLUID FORCES ON SURFACES 103 x
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4.5. FLUID FORCES ON SURFACES 107 I
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4.5. FLUID FORCES ON SURFACES 111 C
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4.5. FLUID FORCES ON SURFACES 113 A
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4.5. FLUID FORCES ON SURFACES 115 F
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4.6. BUOYANCY AND STABILITY 117 In
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4.6. BUOYANCY AND STABILITY 119 ρ
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4.6. BUOYANCY AND STABILITY 121 ( )
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4.6. BUOYANCY AND STABILITY 123 The
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4.6. BUOYANCY AND STABILITY 125 on
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4.6. BUOYANCY AND STABILITY 127 A w
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4.6. BUOYANCY AND STABILITY 129 It
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4.6. BUOYANCY AND STABILITY 131 Thu
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4.6. BUOYANCY AND STABILITY 133 The
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4.6. BUOYANCY AND STABILITY 135 A n
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4.6. BUOYANCY AND STABILITY 137 of
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4.7. RAYLEIGH-TAYLOR INSTABILITY 13
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4.7. RAYLEIGH-TAYLOR INSTABILITY 14
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4.8. QUALITATIVE QUESTIONS 143 can
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Part I Integral Analysis 145
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148 CHAPTER 5. MASS CONSERVATION di
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150 CHAPTER 5. MASS CONSERVATION It
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152 CHAPTER 5. MASS CONSERVATION 5.
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154 CHAPTER 5. MASS CONSERVATION Th
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156 CHAPTER 5. MASS CONSERVATION Wh
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158 CHAPTER 5. MASS CONSERVATION Th
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162 CHAPTER 5. MASS CONSERVATION ri
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166 CHAPTER 5. MASS CONSERVATION En
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168 CHAPTER 5. MASS CONSERVATION Ex
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170 CHAPTER 5. MASS CONSERVATION So
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172 CHAPTER 5. MASS CONSERVATION In
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174 CHAPTER 6. MOMENTUM CONSERVATIO
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198 CHAPTER 7. ENERGY CONSERVATION
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CHAPTER 8 Differential Analysis 8.1
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8.2. MASS CONSERVATION 229 The firs
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8.2. MASS CONSERVATION 231 Combinin
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8.2. MASS CONSERVATION 233 Equation
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8.2. MASS CONSERVATION 235 The dens
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8.2. MASS CONSERVATION 237 Example
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8.3. CONSERVATION OF GENERAL QUANTI
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8.4. MOMENTUM CONSERVATION 241 8.4
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8.4. MOMENTUM CONSERVATION 243 The
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8.5. DERIVATIONS OF THE MOMENTUM EQ
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8.6. BOUNDARY CONDITIONS AND DRIVIN
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8.6. BOUNDARY CONDITIONS AND DRIVIN
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8.7. EXAMPLES FOR DIFFERENTIAL EQUA
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CHAPTER 9 Dimensional Analysis This
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9.1. INTRODUCTORY REMARKS 275 the r
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9.1. INTRODUCTORY REMARKS 277 End S
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9.1. INTRODUCTORY REMARKS 279 Deriv
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9.2. BUCKINGHAM-π-THEOREM 281 para
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9.2. BUCKINGHAM-π-THEOREM 283 magn
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9.2. BUCKINGHAM-π-THEOREM 285 Tabl
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9.2. BUCKINGHAM-π-THEOREM 287 End
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9.2. BUCKINGHAM-π-THEOREM 289 Equa
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9.2. BUCKINGHAM-π-THEOREM 291 the
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9.2. BUCKINGHAM-π-THEOREM 293 than
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9.2. BUCKINGHAM-π-THEOREM 295 Unde
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9.2. BUCKINGHAM-π-THEOREM 297 Solu
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9.3. NUSSELT’S TECHNIQUE 299 The
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9.3. NUSSELT’S TECHNIQUE 301 boun
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9.3. NUSSELT’S TECHNIQUE 303 Noti
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9.3. NUSSELT’S TECHNIQUE 305 In t
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9.3. NUSSELT’S TECHNIQUE 307 Wher
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9.4. SUMMARY OF DIMENSIONLESS NUMBE
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9.5. SUMMARY 319 It can be noticed
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9.6. APPENDIX SUMMARY OF DIMENSIONL
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BIBLIOGRAPHY [1] Buckingham, E. On
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CHAPTER 10 Inviscid Flow or Potenti
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10.1. INTRODUCTION 327 where in thi
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10.1. INTRODUCTION 329 With the ide
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10.1. INTRODUCTION 331 The partial
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10.2. POTENTIAL FLOW FUNCTION 333 T
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10.2. POTENTIAL FLOW FUNCTION 335 t
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10.2. POTENTIAL FLOW FUNCTION 341 9
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10.3. POTENTIAL FLOW FUNCTIONS INVE
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10.4. CONFORMING MAPPING 369 flow d
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10.4. CONFORMING MAPPING 371 The un
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10.5. UNSTEADY STATE BERNOULLI IN A
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10.6. QUESTIONS 375 Table -10.2. Di
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CHAPTER 11 Compressible Flow One Di
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11.3. SPEED OF SOUND 379 to be cont
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11.3. SPEED OF SOUND 381 Solution T
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11.3. SPEED OF SOUND 383 consider a
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11.4. ISENTROPIC FLOW 385 Now, subs
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11.4. ISENTROPIC FLOW 387 Static Pr
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11.4. ISENTROPIC FLOW 389 that the
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11.4. ISENTROPIC FLOW 391 Using the
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11.4. ISENTROPIC FLOW 393 Solution
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11.4. ISENTROPIC FLOW 395 Expressin
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11.4. ISENTROPIC FLOW 397 The tempe
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11.4. ISENTROPIC FLOW 399 Table -11
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11.4. ISENTROPIC FLOW 405 Example 1
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11.5. NORMAL SHOCK 407 In a shock w
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11.5. NORMAL SHOCK 409 Energy equat
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11.5. NORMAL SHOCK 411 The density
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11.5. NORMAL SHOCK 413 or in a dime
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11.5. NORMAL SHOCK 415 which differ
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11.5. NORMAL SHOCK 417 is different
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11.5. NORMAL SHOCK 419 Table -11.3.
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11.6. ISOTHERMAL FLOW 421 Table -11
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11.6. ISOTHERMAL FLOW 423 Rearrangi
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11.6. ISOTHERMAL FLOW 425 dT 0 T 0
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11.6. ISOTHERMAL FLOW 427 10 2 0 1
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11.6. ISOTHERMAL FLOW 429 The fact
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11.6. ISOTHERMAL FLOW 431 Calculati
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11.6. ISOTHERMAL FLOW 433 maximum M
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11.6. ISOTHERMAL FLOW 435 From the
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11.7. FANNO FLOW 437 The energy con
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11.7. FANNO FLOW 439 Differentiatin
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11.7. FANNO FLOW 441 11.7.3 The Mec
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11.7. FANNO FLOW 443 pressure on th
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11.7. FANNO FLOW 445 10 2 0 1 2 3 4
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11.7. FANNO FLOW 447 End Solution A
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11.7. FANNO FLOW 449 M x M y T y T
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11.7. FANNO FLOW 451 11.7.5.1 Maxim
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11.7. FANNO FLOW 453 At the startin
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11.7. FANNO FLOW 455 Fanno Flow 5 4
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11.7. FANNO FLOW 457 11.7.7.1 Choki
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11.7. FANNO FLOW 459 back pressure
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11.7. FANNO FLOW 461 The solution i
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11.7. FANNO FLOW 463 11.7.8 The Pra
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11.7. FANNO FLOW 465 0.9 0.8 0.7 0.
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11.7. FANNO FLOW 467 3.0 2.5 2.0 Co
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11.8. THE TABLE FOR FANNO FLOW 469
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11.9. RAYLEIGH FLOW 471 Table -11.6
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11.10. INTRODUCTION 473 or in simpl
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11.10. INTRODUCTION 475 or explicit
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11.10. INTRODUCTION 477 Table -11.7
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11.10. INTRODUCTION 479 Example 11.
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11.10. INTRODUCTION 481 Example 11.
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11.10. INTRODUCTION 483 what the ma
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CHAPTER 12 Compressible Flow 2-Dime
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12.2. OBLIQUE SHOCK 487 12.2 Obliqu
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12.2. OBLIQUE SHOCK 489 The relatio
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12.2. OBLIQUE SHOCK 491 Where S = 3
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12.2. OBLIQUE SHOCK 493 by evaluati
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12.2. OBLIQUE SHOCK 495 Figure (12.
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12.2. OBLIQUE SHOCK 497 be made. Th
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12.2. OBLIQUE SHOCK 499 demonstrate
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12.2. OBLIQUE SHOCK 501 or explicit
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12.2. OBLIQUE SHOCK 503 Fig. -12.9.
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12.2. OBLIQUE SHOCK 505 Table -12.1
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12.2. OBLIQUE SHOCK 507 Example 12.
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12.2. OBLIQUE SHOCK 509 In the obli
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12.2. OBLIQUE SHOCK 511 M x M ys M
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12.2. OBLIQUE SHOCK 513 M x M y T y
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12.2. OBLIQUE SHOCK 515 M x M yw θ
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12.2. OBLIQUE SHOCK 517 The pressur
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12.2. OBLIQUE SHOCK 519 From these
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12.3. PRANDTL-MEYER FUNCTION 521 as
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12.3. PRANDTL-MEYER FUNCTION 523 Th
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12.3. PRANDTL-MEYER FUNCTION 525 No
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1 2 12.7. FLAT BODY WITH AN ANGLE O
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12.8. EXAMPLES FOR PRANDTL-MEYER FU
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12.9. COMBINATION OF THE OBLIQUE SH
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12.9. COMBINATION OF THE OBLIQUE SH
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CHAPTER 13 Multi-Phase Flow 13.1 In
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13.4. KIND OF MULTI-PHASE FLOW 537
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13.5. CLASSIFICATION OF LIQUID-LIQU
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13.5. CLASSIFICATION OF LIQUID-LIQU
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13.6. MULTI-PHASE FLOW VARIABLES DE
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13.6. MULTI-PHASE FLOW VARIABLES DE
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13.7. HOMOGENEOUS MODELS 547 13.7 H
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13.7. HOMOGENEOUS MODELS 549 There
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13.8. SOLID-LIQUID FLOW 551 where
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13.8. SOLID-LIQUID FLOW 553 So far
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13.9. COUNTER-CURRENT FLOW 555 The
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13.9. COUNTER-CURRENT FLOW 561 For
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13.10. MULTI-PHASE CONCLUSION 565 1
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APPENDIX A The Mathematics Backgrou
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A.1. VECTORS 569 where θ is the an
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A.1. VECTORS 571 Divergence The sam
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A.1. VECTORS 573 R · S =(xî + y 2
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A.1. VECTORS 575 The curl is writte
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A.1. VECTORS 577 The divergence of
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A.2. ORDINARY DIFFERENTIAL EQUATION
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A.3. PARTIAL DIFFERENTIAL EQUATIONS
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A.4. TRIGONOMETRY 595 A.4 Trigonome
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SUBJECTS INDEX 597 Subjects Index S
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SUBJECTS INDEX 599 Ideal gas, 91 Re
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SUBJECTS INDEX 601 Slip condition r
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AUTHORS INDEX 603 Authors Index B B
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