From 83c1bfceb1b681b4bb7253b47491be2d8b2014a1 Mon Sep 17 00:00:00 2001
From: debashisdeb
Date: Fri, 20 Jun 2014 15:42:42 +0530
Subject: removing problem statements

---
 .../CH5.ipynb                                      | 26 ----------------------
 1 file changed, 26 deletions(-)

(limited to 'Materials_science_and_engineering_an_introduction/CH5.ipynb')

diff --git a/Materials_science_and_engineering_an_introduction/CH5.ipynb b/Materials_science_and_engineering_an_introduction/CH5.ipynb
index 5b193d64..caf36165 100644
--- a/Materials_science_and_engineering_an_introduction/CH5.ipynb
+++ b/Materials_science_and_engineering_an_introduction/CH5.ipynb
@@ -27,19 +27,15 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#Diffusion Flux Computation\n",
       "\n",
-      "#Given\n",
       "Ca=1.2       #Concentration at A in  kg/m**3\n",
       "Cb=0.8       #Concentration at B in  kg/m**3\n",
       "xa=5*10**-3   #Position 1 in m\n",
       "xb=10*10**-3  #Position 2 in m\n",
       "\n",
-      "#Calculation\n",
       "D=3*10**-11   #Diffusion coefficient in m**2/s\n",
       "J=-D*(Ca-Cb)/(xa-xb)\n",
       "\n",
-      "#Result\n",
       "print\"Diffusion flux is \",J,\"kg/m**2-s\"\n",
       "\n"
      ],
@@ -68,16 +64,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#Nonsteady-State Diffusion Time Computation I\n",
       "from scipy.optimize import fsolve\n",
-      "#Given\n",
       "Co=0.25        #Initial Conc. in wt%\n",
       "Cs=1.2         #Surface conc. in wt%\n",
       "Cx=0.8         #Conc. at any x  in wt%\n",
       "x=5*10**-4     #Position in m\n",
       "D=1.6*10**-11  #Diffusion coeff in m**2/s\n",
       "\n",
-      "#Calculation\n",
       "import math\n",
       "C=1-((Cx-Co)/(Cs-Co))\n",
       "\n",
@@ -86,7 +79,6 @@
       "z=fsolve(f,1)\n",
       "t=x**2/(4.0*D*z**2.0)\n",
       "\n",
-      "#Result\n",
       "print\"Time required is \",round(t/3600.0,1),\"h\"\n",
       "\n"
      ],
@@ -115,17 +107,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#Nonsteady-State Diffusion Time Computation II\n",
       "\n",
-      "#Given\n",
       "D500=4.8*10**-14     #Diffusion coefficient at 500 C\n",
       "D600=5.3*10**-13     #Diffusion coefficient at 600 C\n",
       "t600=10             #Time in hours to diffuse\n",
       "\n",
-      "#Calcuation\n",
       "t500=D600*t600/D500\n",
       "\n",
-      "#Result\n",
       "print\"Time to diffuse at 500 C is \",round(t500,1),\"h\"\n",
       "\n"
      ],
@@ -154,19 +142,15 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#Diffusion Coefficient Determination\n",
       "\n",
-      "#Given\n",
       "T=550+273            #in K\n",
       "D0=1.2*10**-4        #Temperature independent preexponential in m**2/s\n",
       "Qd=131000            #Activation energy in J/mol-K\n",
       "R=8.31               #Universal Gas constt\n",
       "\n",
-      "#Calculation\n",
       "import math\n",
       "D=D0*math.exp(-Qd/(R*T))\n",
       "\n",
-      "#Result\n",
       "print\"Diffusion coefficient is \",round(D,14),\"m**2/s\"\n",
       "\n"
      ],
@@ -195,21 +179,16 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#Diffusion Coefficient Activation Energy and Preexponential Calculations\n",
       "\n",
-      "#Given\n",
-      "#From graph log D ad 1/T are deducted\n",
       "inv_T1=0.8*10**-3          #Reciprocal of temp.  in K**-1\n",
       "inv_T2=1.1*10**-3          #Reciprocal of temp.  in K**-1\n",
       "logD1=-12.4\n",
       "logD2=-15.45\n",
       "R=8.31                   #Gas law Constant in J/mol-K\n",
       "\n",
-      "#Calculation\n",
       "Qd=-2.3*R*(logD1-logD2)/(inv_T1-inv_T2)\n",
       "print\"Activation energy is\",round(Qd/1000,0),\"KJ\"\n",
       "\n",
-      "#For calculating Peexponential factor\n",
       "D0=10**(logD2+(Qd*inv_T2/(2.3*R)))\n",
       "print\"Preexponential factor is\",round(D0,6),\"m**2/s\"\n",
       "\n"
@@ -240,9 +219,7 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#Diffusion Temperature\u2013Time Heat Treatment Specification\n",
       "\n",
-      "#Given\n",
       "C0=0.2           #Initial concentration in wt%\n",
       "Cs=1             #Surface conc in wt%\n",
       "Cx=0.6           #Conc at any position X in wt%\n",
@@ -255,10 +232,8 @@
       "z=0.4747\n",
       "Dt=(x/(2*z))**2\n",
       "\n",
-      "#Dt=D0*exp(-Qd/RT)*t = value of variable Dt\n",
       "D=Dt/D0\n",
       "\n",
-      "#The tempratures are\n",
       "T1=900.0\n",
       "T2=950.0\n",
       "T3=1000.0\n",
@@ -268,7 +243,6 @@
       "t3=D/math.exp(-Qd/(R*(T3+273)))/3600.0\n",
       "t4=D/math.exp(-Qd/(R*(T4+273)))/3600.0\n",
       "\n",
-      "#Result\n",
       "print\"Temperature in Celcius  are\",T1,T2,T3,T4\n",
       "print\"Time is respectively \",round(t1,1),\"h,\",round(t2,1),\"h,\",round(t3,1),\"h,\",round(t4,1),\"h\"\n",
       "\n"
-- 
cgit