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diff --git a/Fluid_Mechanics_by_John_F_Douglas/Chapter_11.ipynb b/Fluid_Mechanics_by_John_F_Douglas/Chapter_11.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:8adfc21cf4552e14b563ca7c0f2e56ece56cd7f1691cf9486f2cfbd789df7be1"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 11: Boundary Layer"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 11.1, Page 383"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "\n",
+      " #Initializing  the  variables\n",
+      "rho  =  860;\n",
+      "v  =  10**-5;\n",
+      "Us  =  3;\n",
+      "b  =  1.25;\n",
+      "l  =  2;\n",
+      "\n",
+      " #Calculations\n",
+      "x  =  1;                                                                    #  At  x  =1  \n",
+      "Rex  =  Us*x/v;\n",
+      "ReL  =  Us*l/v  ;\n",
+      "mu  =    rho*v;\n",
+      "T0  =  0.332*mu*Us/x*Rex**0.5;\n",
+      "Cf  =  1.33*ReL**-0.5;\n",
+      "F  =  rho*Us**2*l*b*Cf  ;\n",
+      "print \"shear stress                                (N/m^2) :\" ,round(T0,1)\n",
+      "print \"Total, double-sided resistance of the plate (N)     :\",round(F,3)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "shear stress                                (N/m^2) : 4.7\n",
+        "Total, double-sided resistance of the plate (N)     : 33.224\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 11.2, Page 387"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "import math\n",
+      "\n",
+      "\n",
+      " #Initializing  the  variables\n",
+      "Us  =  6;\n",
+      "b  =  3;\n",
+      "l  =  30;\n",
+      "rho  =  1000;\n",
+      "mu  =  10**-3;\n",
+      "T  =  20+273;                                                          #  Temperature  in  Kelvin\n",
+      "\n",
+      " #Calculations\n",
+      " \n",
+      "ReL  =  rho*Us*l/mu;  \n",
+      "Cf  =  0.455*math.log10(ReL)**-2.58    ;\n",
+      "\n",
+      "F  =  rho*Us**2*l*b*Cf  ;\n",
+      "Lt  =  10**5*mu/(rho*Us);                                    #  Assuming  transition  at  Rel  =  10**5\n",
+      "\n",
+      "print \"Drag Force (kN)       :\", round(F/1000,2)\n",
+      "print \"Transition length (m) :\",round(Lt,4)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Drag Force (kN)       : 6.36\n",
+        "Transition length (m) : 0.0167\n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
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