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+{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:2f6bc3a0f00ca48f89200f1a14edc0c65849595040c83c5100245e53f0cc525b"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Chapter : Compressible Flow"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 11.1 Page no 420"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "from math import *\n",
+ "\n",
+ "from __future__ import division\n",
+ "\n",
+ "\n",
+ "T1 = 273 + 15 # temperature in K\n",
+ "\n",
+ "T2 = 273 + 90 # temperature in K\n",
+ "\n",
+ "Cp = 0.24 # cp for air in kcal/kgK\n",
+ "\n",
+ "\n",
+ "dh = Cp*(T2-T1) # enthalpy per kg of air\n",
+ "\n",
+ "H = 10*dh # total enthallpy of 10 kg air\n",
+ "\n",
+ "print \"Total change in enthalpy for 10 kg air = \",round(H,0),\"kcal\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Total change in enthalpy for 10 kg air = 180.0 kcal\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 11.2 Page no 420"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "from math import *\n",
+ "\n",
+ "from __future__ import division\n",
+ "\n",
+ "\n",
+ "T1 = 273 + 15 # temperature in K\n",
+ "\n",
+ "T2 = 273 + 90 # temperature in K\n",
+ "\n",
+ "P1 = 40 + 101.3 # pressure in abs\n",
+ "\n",
+ "P2 = 360 + 101.3 # presure in abs\n",
+ "\n",
+ "Cv = 0.171 # Specific volume Coefficient of air\n",
+ "\n",
+ "k = 1.4 # gas constant\n",
+ "\n",
+ "\n",
+ "dS = Cv*log((T2/T1)**k*(P2/P1)**(1-k))\n",
+ "\n",
+ "S = 10*dS\n",
+ "\n",
+ "print \"Total change in enthalpy of 10 Kg of air =\",round(S,3),\"kcal/K\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Total change in enthalpy of 10 Kg of air = -0.255 kcal/K\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 11.3 Page no 421"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "from math import *\n",
+ "\n",
+ "from __future__ import division\n",
+ "\n",
+ "\n",
+ "P1 = 10 # pressure in psia\n",
+ "\n",
+ "P2 = 30 # pressure in psia\n",
+ "\n",
+ "T1 = 460+110 # temperature in R\n",
+ "\n",
+ "k =1.4 # gas constant\n",
+ "\n",
+ "T2 = T1*(P2/P1)**((k-1)/k)\n",
+ "\n",
+ "t2 = T2-460 # final temperature of air\n",
+ "\n",
+ "print \"Final temperature if air = \",round(t2,1),\"F\"\n",
+ "\n",
+ "Cv = 0.157 # coefficient of air \n",
+ "\n",
+ "W = Cv*(T2-T1) # work done per unit mass of oxygen\n",
+ "\n",
+ "Tw = 10*W # total work done on 10 slugs\n",
+ "\n",
+ "print \"Total work done on 10 slugs = \",round(Tw,0),\"Btu\" \n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Final temperature if air = 320.2 F\n",
+ "Total work done on 10 slugs = 330.0 Btu\n"
+ ]
+ }
+ ],
+ "prompt_number": 4
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 11.4 Page no 426"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "from math import *\n",
+ "\n",
+ "from __future__ import division\n",
+ "\n",
+ "\n",
+ "\n",
+ "S =1 # specific gravity\n",
+ "\n",
+ "rho = S*1000 # density in kg/m**3\n",
+ "\n",
+ "bta = 2.2*10**9 # Bulk modulus of elasticity\n",
+ "\n",
+ "\n",
+ "S1 =0.79 # specific gravity\n",
+ "\n",
+ "rho2 = S1*1000 # density in kg/m**3\n",
+ "\n",
+ "bta2 = 1.21*10**9 # Bulk modulus of elasticity\n",
+ "\n",
+ "\n",
+ "k = 1.4 # gas constant for air\n",
+ "\n",
+ "R = 287 # universal gas constant\n",
+ "\n",
+ "T = 273+20 # temperature in K\n",
+ "\n",
+ "\n",
+ "C1 = sqrt(bta/rho)\n",
+ "\n",
+ "C2 = sqrt(bta2/rho2)\n",
+ "\n",
+ "print \"Speed of sound in water =\",round(C1,0),\"m/s\"\n",
+ "\n",
+ "print \"Speed of sound in ethly alcohol =\",round(C2,0),\"m/s\"\n",
+ "\n",
+ "C3 = sqrt(k*R*T)\n",
+ "\n",
+ "print \"Speed of sound in Air =\",round(C3,0),\"m/s\"\n",
+ "\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Speed of sound in water = 1483.0 m/s\n",
+ "Speed of sound in ethly alcohol = 1238.0 m/s\n",
+ "Speed of sound in Air = 343.0 m/s\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 3,
+ "metadata": {},
+ "source": [
+ "Example 11.5 Page no 431"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "\n",
+ "from math import *\n",
+ "\n",
+ "from __future__ import division\n",
+ "\n",
+ "\n",
+ "P1 = 1.5 # pressure in psia\n",
+ "\n",
+ "T1 = 40 + 460 # temperature in R\n",
+ "\n",
+ "k = 1.4 # gas constant\n",
+ "\n",
+ "R = 1716 # universal gas constant in ft.lb/slug R\n",
+ "\n",
+ "V1 = 1500 # velocity in ft/s\n",
+ "\n",
+ "\n",
+ "c1 = sqrt(k*R*T1)\n",
+ "\n",
+ "M1 = V1/c1\n",
+ "\n",
+ "M2 = sqrt((2+(k-1)*M1**2)/(2*k*M1**2-(k-1)))\n",
+ "print M2\n",
+ "\n",
+ "P2 = P1*((1+k*M1**2)/(1+k*M2**2))\n",
+ "\n",
+ "print \"Pressure at downstream = \",round(P2,2),\"psia\"\n",
+ "\n",
+ "T2 = T1*((1+0.5*(k-1)*M1**2)/(1+0.5*(k-1)*M2**2))\n",
+ "\n",
+ "t2 = T2-460\n",
+ "\n",
+ "print \"Temperature at downstream = \",round(t2,1),\"F\"\n",
+ "V2 = M2*sqrt(k*R*t2)\n",
+ "\n",
+ "print \"Velocity downstream = \",round(V2,2),\"ft/s\"\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "0.753305702898\n",
+ "Pressure at downstream = 3.03 psia\n",
+ "Temperature at downstream = 157.3 F\n",
+ "Velocity downstream = 463.02 ft/s\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+} \ No newline at end of file
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