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{
"metadata": {
"name": "",
"signature": "sha256:925f1eedf50c877ed321461a7c6fe2319e03573a843bd9a8a44c0d22ceada0ec"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 5 : Control-Volume Analysis"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.1 Page No : 114"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\n",
"#initialisation of variables\n",
"w= 20. \t#lbm/sec plant rate\n",
"sh= 0.004\n",
"mw2= 0.12 \t#lbm/sec stream rate\n",
"ma3= 12.2 \t#lbm/sec rates of air\n",
"mw3= 0.130 \t#lbm/sec water rate\n",
"\t\n",
"#CALCULATIONS\n",
"mw1= w/((1/sh)+1)\n",
"ma1= w-mw1\n",
"ma4= ma1-ma3\n",
"mw4= mw1+mw2-mw3\n",
"mr= ma4+mw4\n",
"sh1= mw4/ma4\n",
"\t\n",
"#RESULTS\n",
"print ' mw1 = %.4f lbm/sec'%(mw1)\n",
"print ' ma1 = %.2f lbm/sec'%(ma1)\n",
"print ' ma4 = %.2f lbm/sec'%(ma4)\n",
"print ' mw4 = %.4f lbm/sec'%(mw4)\n",
"print ' mr = %.2f lbm/sec'%(mr)\n",
"print ' specific humidity = %.5f lbm/sec'%(sh1)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" mw1 = 0.0797 lbm/sec\n",
" ma1 = 19.92 lbm/sec\n",
" ma4 = 7.72 lbm/sec\n",
" mw4 = 0.0697 lbm/sec\n",
" mr = 7.79 lbm/sec\n",
" specific humidity = 0.00903 lbm/sec\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.2 Page No : 131"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\n",
"#initialisation of variables\n",
"w= 62.4 \t#lbf/ft**3 fluid density\n",
"g= 32.2 \t#ft/sec**2 \n",
"v= 86.5 \t#ft/sec velocity\n",
"d2= 3. \t#in\n",
"d1= 6. \t#in\n",
"dp= 50. \t#lbf/in**2 gauge pressure\n",
"\t\n",
"#CALCULATIONS\n",
"Fb= ((math.pi*(w/g)*v**2*(1/d1)**2*(1-(d2/d1)**2)*0.25)-dp*144*(math.pi/4)*(1/d2)**2)\n",
"\t\n",
"#RESULTS\n",
"print 'Load on the bolts = %.f lbf'%(Fb)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Load on the bolts = -391 lbf\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.3 Page No : 133"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\n",
"#initialisation of variables\n",
"F1= 237. \t#lb\n",
"dp= 50. \t#lbf/in**2\n",
"D= 6. \t#in diameter\n",
"\t\n",
"#CALCULATIONS\n",
"F2= dp*144*(math.pi/4)*(D/12)**2\n",
"Fb= F1-F2\n",
"\t\n",
"#RESULTS\n",
"\n",
"print 'Load on the bolts = %.f lbf'%(Fb)\n",
"#rounding-off error"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Load on the bolts = -1177 lbf\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.5 Page No : 137"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\n",
"#initialisation of variables\n",
"w1= 0.0286 \t#lbm/ft**3 density\n",
"v= 2500. \t#ft/sec velocity\n",
"A= 2.5 \t#ft**3 area\n",
"k= 0.015\n",
"p2= 700. \t#lbf/ft**2\n",
"p1= 628. \t#lbf/ft**2 pressure\n",
"v2= 3500. \t#ft/sec outlet\n",
"g= 32.17 \t#ft/sec**2\n",
"\t\n",
"#CALCULATIONS\n",
"ma= w1*v*A\n",
"mf= round(k*ma,2)\n",
"mt= round(ma+mf,1)\n",
"F= (p2-p1)*A+(mt*v2/g)-(ma*v/g)\n",
"\n",
"\n",
"#RESULTS\n",
"print ' air mass flow rate = %.2f lbm/sec'%(ma)\n",
"print ' Fuel flow rate = %.2f lbm/sec'%(mf)\n",
"print ' Fuel flow rate at station 2 = %.2f lbm/sec'%(mt)\n",
"print ' Thrust force = %d lbf'%(round(F,-1))\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" air mass flow rate = 178.75 lbm/sec\n",
" Fuel flow rate = 2.68 lbm/sec\n",
" Fuel flow rate at station 2 = 181.40 lbm/sec\n",
" Thrust force = 6020 lbf\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
