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diff --git a/Introduction_to_flight_by_J_D_Anderson/Appendix.ipynb b/Introduction_to_flight_by_J_D_Anderson/Appendix.ipynb new file mode 100755 index 00000000..d2f0522f --- /dev/null +++ b/Introduction_to_flight_by_J_D_Anderson/Appendix.ipynb @@ -0,0 +1,352 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# Appendix C" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 1" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Sublimation Pressure: 0.00109 KPa\n" + ] + } + ], + "source": [ + "# -*- coding: utf8 -*-\n", + "from __future__ import division\n", + "from math import exp\n", + "#Example: 14.1\n", + "'''Determine the sublimation pressure of water vapor at −60◦C using data available in the\n", + "steam tables.\n", + "Control mass: Water.'''\n", + "\n", + "#Variable Declaration: \n", + "#from table in appendix B.1.5\n", + "T1 = 213.2\t\t\t#K, Temperature at state 1\n", + "P2 = 0.0129\t\t\t#kPa, pressure at state 2\n", + "T2 = 233.2\t\t\t#K, Temperature at state 2\n", + "hig = 2838.9\t\t#kJ/kg, enthalpy of sublimation \n", + "R = .46152\t\t\t#Gas constant \n", + "\n", + "#Calculations:\n", + "P1 = P2*exp(-hig/R*(1/T1-1/T2)) #using relation log(P2/P1) = (hig/R)*(1/T1-1/T2) \n", + "\n", + "#Results:\n", + "print 'Sublimation Pressure: ',round(P1,5),'KPa'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 4" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Change in internal energy: -159.4 J/Kg\n" + ] + } + ], + "source": [ + "# -*- coding: utf8 -*-\n", + "from __future__ import division\n", + "#Example: 14.4\n", + "'''The pressure on a block of copper having a mass of 1 kg is increased in a reversible process\n", + "from 0.1 to 100 MPa while the temperature is held constant at 15◦C. Determine the work\n", + "done on the copper during this process, the change in entropy per kilogram of copper, the\n", + "heat transfer, and the change of internal energy per kilogram.\n", + "Over the range of pressure and temperature in this problem, the following data can\n", + "be used:\n", + "Volume expansivity = αP = 5.0 × 10−5 K−1\n", + "Isothermal compressibility = βT = 8.6 × 10−12 m2/N\n", + "Specific volume = 0.000 114 m3/kg'''\n", + "\n", + "#Variable Declaration: \n", + "#known data\n", + "ap = 5*10**-5\t\t\t\t#K**-1 Volume expansivity\n", + "bt = 8.6*10**-12\t\t\t#m**2/N, Isothermal compressibility\n", + "v = 0.000114\t\t\t\t#m**3/kg, specific volume\n", + "P2 = 100*10**6\t\t\t\t#pressure at state 2 in kPa\n", + "P1 = 100\t\t\t\t\t#pressure at state 1 in kPa\n", + "T = 288.2\t\t\t\t\t#Temperature in K\n", + "\n", + "#Calculations:\n", + "w = -v*bt*(P2**2-P1**2)/2\t#work done in J/kg\n", + "q = -T*v*ap*(P2-P1)\t\t\t#heat in J/kg\n", + "du = q-w\t\t\t\t\t#change in internal energy in J/kg\n", + "\n", + "#Results:\n", + "print 'Change in internal energy: ',round(du,1),'J/Kg'\n", + " " + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 5" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Enthalpy change: 18.73 KJ/Kg\n", + "Temperature : 146.0 K\n" + ] + } + ], + "source": [ + "# -*- coding: utf8 -*-\n", + "from __future__ import division\n", + "#Example: 14.5\n", + "'''Nitrogen is throttled from 20 MPa, −70◦C, to 2 MPa in an adiabatic, steady-state, steadyflow\n", + "process. Determine the final temperature of the nitrogen.\n", + "Control volume:\n", + "Inlet state:\n", + "Exit state:\n", + "Process:\n", + "Diagram:\n", + "Model:\n", + "Throttling valve.\n", + "P1, T1 known; state fixed.\n", + "P2 known.\n", + "Steady-state, throttling process.\n", + "Figure 14.8.\n", + "Generalized charts, Fig. D.2.'''\n", + "\n", + "#Variable Declaration: \n", + "#from table A.2\n", + "P1 = 20\t\t#pressure at state 1 in MPa\n", + "P2 = 2\t\t#pressure at state 2 in MPa\n", + "T1 = 203.2\t\t#Temperature at state 1 in K\n", + "Pr1 = P1/3.39\t\t#Reduced pressure at state 1\n", + "Pr2 = P2/3.39\t\t#Reduced pressure at state 2\n", + "Tr1 = T1/126.2\t\t#Reduced temperature\n", + "#from compressibility chart h1*-h1 = 2.1*R*Tc\n", + "#from zero pressure specific heat data h1*-h2* = Cp*(T1a-T2a)\n", + "#h2*-h2 = 0.5*R*Tc\n", + "#this gives dh = h1-h2 = -2.1*R*Tc+Cp*(T1a-T2a)+0.5*R*Tc\n", + "R = 0.2968\t\t#gas constant for given substance\n", + "Tc = 126.2\t\t#K, Constant temperature\n", + "Cp = 1.0416\t\t#heat enthalpy at constant pressure in kJ/kg\n", + "T2 = 146\t\t#temperature at state 2\n", + "\n", + "#Calculations:\n", + "dh = 0.5*R*Tc#\n", + "\n", + "#Results:\n", + "print 'Enthalpy change: ',round(dh,2),'KJ/Kg'\n", + "print 'Temperature :',round(T2,2),'K' " + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 6" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Enthalpy change: 61.98 kJ/kg\n", + "Entropy Change: 1.0782 kJ/kg.K\n" + ] + } + ], + "source": [ + "# -*- coding: utf8 -*-\n", + "from __future__ import division\n", + "from math import log\n", + "\n", + "#Example: 14.6\n", + "'''Nitrogen at 8 MPa, 150 K, is throttled to 0.5 MPa. After the gas passes through a short\n", + "length of pipe, its temperature is measured and found to be 125 K. Determine the heat\n", + "transfer and the change of entropy using the generalized charts. Compare these results\n", + "with those obtained by using the nitrogen tables.\n", + "Control volume:\n", + "Inlet state:\n", + "Exit state:\n", + "Process:\n", + "Diagram:\n", + "Model:\n", + "Throttle and pipe.\n", + "P1, T1 known; state fixed.\n", + "P2, T2 known; state fixed.\n", + "Steady state.\n", + "Figure 14.10.\n", + "Generalized charts, results to be compared with those\n", + "obtained with nitrogen tables.'''\n", + "\n", + "#Variable Declaration: \n", + "#from table A.2\n", + "P1 = 8\t\t\t\t\t#pressure at state 1 in MPa\n", + "P2 = 0.5\t\t\t\t#pressure at state 2 in MPa\n", + "T1 = 150\t\t\t\t#Temperature at state 1 in K\n", + "Pr1 = P1/3.39\t\t\t#Reduced pressure at state 1\n", + "Pr2 = P2/3.39\t\t\t#Reduced pressure at state 2\n", + "Tr1 = T1/126.2\t\t\t#Reduced temperature\n", + "T2 = 125\t\t\t\t#Temperature at state 2\n", + "R = 0.2968\t\t\t\t#gas constant for given substance\n", + "Tc = 126.2\t\t\t\t#K, Constant temperature\n", + "Cp = 1.0416\t\t\t\t#Heat enthalpy at constant pressure in kJ/kg\n", + "\n", + "#Calculations:\n", + "dh = (2.35)*R*Tc+Cp*(T2-T1)\t\t#\n", + "ds = 1.6*R-0.1*R+Cp*log(T2/T1)-R*log(P2/P1)\n", + "\n", + "#Results:\n", + "print 'Enthalpy change: ',round(dh,2),'kJ/kg'\n", + "print 'Entropy Change: ',round(ds,4),'kJ/kg.K'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example 7" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Percentage deviation in specific volume using Kays rule: 4.8 %\n", + "Percentage deviation in specific volume using vander waals eqn: 6.4 %\n" + ] + } + ], + "source": [ + "# -*- coding: utf8 -*-\n", + "from __future__ import division\n", + "from math import sqrt\n", + "#Example: 14.7\n", + "'''A mixture of 80% CO2 and 20% CH4 (mass basis) is maintained at 310.94 K, 86.19 bar,\n", + "at which condition the specific volume has been measured as 0.006757 m3/kg. Calculate\n", + "the percent deviation if the specific volume had been calculated by (a) Kay’s rule and (b)\n", + "van der Waals’ equation of state.\n", + "Control mass:\n", + "State:\n", + "Model:\n", + "Gas mixture.\n", + "P, v, T known.\n", + "(a) Kay’s rule. (b) van der Waals’ equation.'''\n", + "#Keys:\n", + "#a-denotes C02\n", + "#b-denotes CH4\n", + "#c-denotes critical conditions\n", + "\n", + "#Variable Declaration: \n", + "T = 310.94\t\t\t\t#Temperature of mixture K\n", + "P = 86.19\t\t\t\t#Pressure of mixture in MPa\n", + "Tca = 304.1\t\t\t\t#K\n", + "Tcb = 190.4\t\t\t\t#K\n", + "Pca = 7.38\t\t\t\t#MPa\n", + "Pcb = 4.60\t\t\t\t#MPa\n", + "Ra = 0.1889\t\t\t\t#gas constant for a in kJ/kg.K\n", + "Rb = 0.5183\t\t\t\t#gas constant for b in kJ/kg.K\n", + "xa = 0.8\t\t\t\t#fraction of CO2\n", + "xb = 0.2\t\t\t\t#fraction of CH4\n", + "Ma = 44.01\t\t\t\t#molecular mass of a\n", + "Mb = 16.043\t\t\t\t#molecular mass of b\n", + "Zm = 0.7\t\t\t\t#Compressiblity from generalised compressibility chart\n", + "ve = 0.0006757\t\t\t#experimental specific volume in m**3/kg\n", + "\n", + "#Calculations:\n", + "Rm = xa*Ra+xb*Rb\t\t#mean gas constant in kJ/kg.K\n", + "ya = xa/Ma/(xa/Ma+xb/Mb)#mole fraction of a\n", + "yb = xb/Mb/(xa/Ma+xb/Mb)#mole fraction of b\n", + "Tcm = ya*Tca+yb*Tcb\t\t#mean critical temp in K\n", + "Pcm = ya*Pca+yb*Tcb\t\t#mean critical pressure n MPa\n", + "Trm = T/Tcm\n", + "Prm = P/Pcm\n", + "vc = Zm*Rm*T/P/1000\t\t#specific volume calculated in m**3/kg\n", + "pd1 = (ve-vc)/ve*100\t#percent deviation\n", + "Aa = 27*Ra**2*Tca**2/(64*Pca*1000)\n", + "Ba = Ra*Tca/(8*Pca*1000)\n", + "Ab = 27*Rb**2*Tcb**2/(64*Pcb*1000)\n", + "Bb = Rb*Tcb/(8*Pcb*1000)\n", + "Am = (xa*sqrt(Aa)+xb*sqrt(Ab))**2\n", + "Bm = (xa*Ba+xb*Bb)\n", + "vc = 0.0006326\t\t\t#calculated specific volume in m**3/kg\n", + "pd2 = (ve-vc)/ve*100\n", + "\n", + "#Results:\n", + "print 'Percentage deviation in specific volume using Kays rule: ',round(pd1,1),'%'\n", + "print 'Percentage deviation in specific volume using vander waals eqn: ',round(pd2,1),'%' " + ] + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 2", + "language": "python", + "name": "python2" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.6" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |