removing problem statements

1 files changed, 0 insertions, 74 deletions

diff --git a/Introduction_To_Chemical_Engineering/ch4.ipynb b/Introduction_To_Chemical_Engineering/ch4.ipynb
index 4c312cd2..3a5046ad 100644
--- a/Introduction_To_Chemical_Engineering/ch4.ipynb
+++ b/Introduction_To_Chemical_Engineering/ch4.ipynb
@@ -27,18 +27,14 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find water compressibility\n",
       "\n",
       "import math \n",
       "\n",
-      "# Variables\n",
       "delta_p=70.;   #in bar\n",
       "Et=20680.     #in bar\n",
       "\n",
-      "# Calculations\n",
       "compressibility = delta_p/Et;\n",
       "\n",
-      "# Results\n",
       "print \"compressibilty of water = %f\"%(compressibility)\n"
      ],
      "language": "python",
@@ -66,14 +62,11 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the viscosity of oil\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "F=0.5*9.8;   #in N\n",
       "A=3.14*0.05*0.15;   #in m2\n",
       "\n",
-      "# Calculations and Results\n",
       "shear_stress=F/A;   #in Pa\n",
       "print \"shear_stress = %f Pa\"%(shear_stress)\n",
       "\n",
@@ -107,17 +100,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find variation of losses with velocity\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "loss_ratio=3.6;     #delta_P2/delta_P1=3.6\n",
       "velocity_ratio=2.;   #u2/u1=2\n",
       "\n",
-      "# Calculations\n",
       "n=math.log(loss_ratio,2);  #delta_P2/delta_P1=(u2/u1)**n\n",
       "\n",
-      "# Results\n",
       "print \"power constant = %f flow is turbulent\"%(n)\n"
      ],
      "language": "python",
@@ -145,16 +134,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the boundary layer properties\n",
       "\n",
       "import math \n",
       "print ('part 1')\n",
       "\n",
-      "# Variables\n",
       "x=0.05   #in m\n",
       "density=1000.   #in kg/m3\n",
       "\n",
-      "# Calculations and Results\n",
       "viscosity=1.*10**-3    #in Pa-s\n",
       "u=1.   #in m/s\n",
       "Re=(density*u*x)/viscosity;\n",
@@ -210,10 +196,8 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the flow properties\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "d1=0.05   #in m\n",
       "A1=(3.14*d1**2)/4.;\n",
       "density_1=2.1   #in kg/m3\n",
@@ -221,7 +205,6 @@
       "P1=1.8;   #in bar\n",
       "P2=1.3;   #in bar\n",
       "\n",
-      "# Calculations and Results\n",
       "w=density_1*A1*u1;\n",
       "density_2=density_1*(P2/P1);\n",
       "print \"density at section 2 = %f kg/cubic meter\"%(density_2)\n",
@@ -255,19 +238,15 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the temperature increase\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "Q=0.001*10**5   #in J/s\n",
       "w=0.001*1000   #in kg/s\n",
       "density=1000.   #in kg/m3\n",
       "cp=4.19*10**3   #in J/kg K\n",
       "\n",
-      "# Calculations\n",
       "delta_T=Q/(w*cp);\n",
       "\n",
-      "# Results\n",
       "print \"Temperature increase = %f degree celcius\"%(delta_T)\n"
      ],
      "language": "python",
@@ -295,17 +274,14 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the pressure\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "u1=0;   #in m/s\n",
       "ws=0;\n",
       "P1=0.7*10**5    #in Pa\n",
       "P3=0\n",
       "density=1000   #in kg/m3\n",
       "\n",
-      "# Calculations and Results\n",
       "u3=((2*(P1-P3))/density)**0.5;\n",
       "print \"u3 = %f m/s\"%(u3)\n",
       "\n",
@@ -313,7 +289,6 @@
       "u2=u3/ratio_area;\n",
       "print \"u2 = %f m/s\"%(u2)\n",
       "\n",
-      "#applying bernoulli's equation\n",
       "P2=1.7*10**5-((density*u2**2)/2)\n",
       "print \"P2 = %f Pa\"%(P2)\n",
       "print \"this flow is physically unreal\"\n"
@@ -346,15 +321,12 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the power requirements\n",
       "\n",
       "import math \n",
       "\n",
-      "# Variables\n",
       "Q=3800./(24*3600)    #in m3/s\n",
       "d=0.202    #in m\n",
       "\n",
-      "# Calculations\n",
       "u=Q/((3.14/4)*d**2);    #in m/s\n",
       "delta_P=5.3*10**6    #in Pa\n",
       "density=897.    #in kg/m3\n",
@@ -363,7 +335,6 @@
       "mass_flow_rate= Q*density;\n",
       "power=(ws*mass_flow_rate)/0.6;\n",
       "\n",
-      "# Results\n",
       "print \"power required = %f kW\"%(power/1000)\n",
       "\n"
      ],
@@ -392,15 +363,12 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the tube length\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "density=1000    #in kg/m3\n",
       "viscosity=1*10**-3   #in Pa s\n",
       "P=100*1000    #in Pa\n",
       "\n",
-      "# Calculations and Results\n",
       "vdP=P/density;\n",
       "\n",
       "Q=2.5*10**-3/(24*3600)\n",
@@ -411,7 +379,6 @@
       "Re=density*u*0.0005/viscosity;\n",
       "print \"Re = %f\"%(Re)\n",
       "\n",
-      "#F=18.86*L\n",
       "L=(-u**2+vdP)/18.86;\n",
       "print \"L = %f m\"%(L)\n"
      ],
@@ -442,16 +409,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the discharge pressure\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "d=0.025     #in m\n",
       "u=3.        #in m/s\n",
       "density=894.   #in kg/m3\n",
       "viscosity=6.2*10**4     #in Pa-s\n",
       "\n",
-      "# Calculations and Results\n",
       "Re=(u*d*density)/viscosity;\n",
       "f=0.0045;\n",
       "L=50.;\n",
@@ -489,15 +453,12 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the level difference\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "Q=0.8*10**-3;   #in m3/s\n",
       "d=0.026    #in m\n",
       "A=(3.14*(d**2))/4   #in m2\n",
       "\n",
-      "# Calculations\n",
       "u=Q/A;    #in m/s\n",
       "density=800    #in kg/m3\n",
       "viscosity=0.0005   #in Pa-s\n",
@@ -507,7 +468,6 @@
       "L=60\n",
       "h_f=2*f*((u**2)/9.8)*(L/d);\n",
       "\n",
-      "# Results\n",
       "print \"level difference = %f m\"%(h_f)\n"
      ],
      "language": "python",
@@ -535,16 +495,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the engery cost\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "delta_z=50;    #in m\n",
       "L=290.36    #in m\n",
       "d=0.18    #in m\n",
       "Q=0.05    #in m3/s\n",
       "\n",
-      "# Calculations\n",
       "A=(3.14*d**2)/4;    #in m2\n",
       "u=Q/A;    #in m/s\n",
       "density=1180;   #in kg/m3\n",
@@ -558,7 +515,6 @@
       "power=mass_flow_rate*ws/1000;   #in KW\n",
       "energy_cost=power*24*0.8;\n",
       "\n",
-      "# Results\n",
       "print \"Energy cost = Rs %f\"%(energy_cost)\n"
      ],
      "language": "python",
@@ -586,16 +542,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the pressure loss\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "density=998   #in kg/m3\n",
       "viscosity=0.0008  #in Pa-s\n",
       "d=0.03   #in m\n",
       "u=1.2   #in m/s\n",
       "\n",
-      "# Calculations\n",
       "Re=density*d*u/viscosity;\n",
       "\n",
       "f=0.0088;\n",
@@ -605,7 +558,6 @@
       "delta_P=(2*f*u**2*L)/d;   #in Pa\n",
       "delta_P_coil=delta_P*(1+(3.54*(d/D)));\n",
       "\n",
-      "# Results\n",
       "print \"frictional pressure drop = %f kPa\"%(delta_P_coil)\n"
      ],
      "language": "python",
@@ -633,11 +585,9 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find pressure drop per unit length\n",
       "\n",
       "import math \n",
       "\n",
-      "# Variables\n",
       "b=0.050    #in m\n",
       "a=0.025    #in m\n",
       "d_eq=b-a  #in m\n",
@@ -645,14 +595,12 @@
       "u=3    #in m/s\n",
       "viscosity = 0.001\n",
       "\n",
-      "# Calculations\n",
       "Re=d_eq*u*density/viscosity;\n",
       "\n",
       "e=40*10**6   #in m\n",
       "f=0.0062;\n",
       "P_perunit_length=2*f*density*u**2/d_eq;   #in Pa/m\n",
       "\n",
-      "# Results\n",
       "print \"pressure per unit length = %f Pa/m\"%(P_perunit_length)\n"
      ],
      "language": "python",
@@ -680,17 +628,13 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the flow rate\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "d = 0.3   #in m\n",
       "u = 17.63   #avg velocity in m/s\n",
       "\n",
-      "# Calculations\n",
       "q = (3.14/4)*d**2*u;\n",
       "\n",
-      "# Results\n",
       "print \"volumetric flow rate = %f cubic meter per second\"%(q)\n"
      ],
      "language": "python",
@@ -718,18 +662,14 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the size of pipe required\n",
       "\n",
       "import math \n",
       "\n",
-      "# Variables\n",
       "d = 0.15   #in m\n",
       "\n",
-      "# Calculations\n",
       "u = (0.0191/0.15**2);   #in m/s\n",
       "q = (3.14/4)*d**2*u;\n",
       "\n",
-      "# Results\n",
       "print \"volumetric flow rate = %f cubic meter/s\"%(q)\n"
      ],
      "language": "python",
@@ -757,15 +697,12 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the pressure gradient\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "Q=0.0003    #in m3/s\n",
       "d=0.05    #in m\n",
       "A=(3.14*d**2)/4;\n",
       "\n",
-      "# Calculations\n",
       "u=Q/A;\n",
       "\n",
       "density=1000;   #in kg/m3\n",
@@ -778,11 +715,9 @@
       "L=0.5   #in m\n",
       "delta_Pf=fm*((density*L*u**2)/dp)*((1-e)/e**3);   #in Pa\n",
       "\n",
-      "#applying bernoulli's equation, we get\n",
       "delta_P=delta_Pf-(density*9.8*L);\n",
       "pressure_gradient=delta_P/(L*1000);   #in kPa/m\n",
       "\n",
-      "# Results\n",
       "print \"required pressure gradient = %f kPa/m of packed height\"%(pressure_gradient)\n"
      ],
      "language": "python",
@@ -810,18 +745,15 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find minimum fluidization velocity\n",
       "\n",
       "from scipy.optimize import fsolve \n",
       "import math \n",
       "\n",
-      "# Variables\n",
       "d=120*10**-6    #in m\n",
       "density=2500   #particle density in kg/m3\n",
       "e_min=0.45;\n",
       "density_water=1000   #in kg/m3\n",
       "\n",
-      "# Calculations and Results\n",
       "viscosity=0.9*10**-3;   #in Pa-s\n",
       "umf=(d**2*(density-density_water)*9.8*e_min**3)/(150*viscosity*(1-e_min));\n",
       "print \"minimum fludization velocity = %f m/s\"%(umf)\n",
@@ -829,11 +761,9 @@
       "Re_mf=(d*umf*density_water)/(viscosity*(1-e_min));\n",
       "\n",
       "\n",
-      "#given that uo/umf=10\n",
       "def F(e):\n",
       "    return e**3+1.657*e-1.675;\n",
       "\n",
-      "#initial guess\n",
       "x = 10.;\n",
       "e = fsolve(F,x)\n",
       "\n",
@@ -868,21 +798,17 @@
      "cell_type": "code",
      "collapsed": false,
      "input": [
-      "#to find the power requirements\n",
       "\n",
       "import math \n",
-      "# Variables\n",
       "P=9807.   #in Pa\n",
       "density=1000.   #in kg/m3\n",
       "Q=250./(60.*density)\n",
       "head=25.   #in m\n",
       "\n",
-      "# Calculations\n",
       "w= head*Q*P;     #in kW\n",
       "power_delivered=w/0.65;\n",
       "power_taken=power_delivered/0.9;\n",
       "\n",
-      "# Results\n",
       "print \"power_delivered = %f kW\"%(power_delivered/1000)\n",
       "print \"power taken by motor = %f kW\"%(power_taken/1000)\n",
       "\n"