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+// Example 10_2
+clc;clear;funcprot(0);
+//Given data
+D=50*10^-6;// Diameter of spherical ash particle in m
+T=-50;// °C
+P=55;// kPa
+rho_p=1240;// The density of the particle in kg/m^3
+//Properties
+mu=1.474*10^-5;// kg/m.s
+rho_air=0.8588;// kg/m^3
+g=9.81;// The acceleration due to gravity  in m/s^2
+
+//Calculation
+V=(D^2/(18*mu))*(rho_p-rho_air)*g;//The terminal velocity of this particle in m/s
+printf('\nThe terminal velocity of this particle,V=%0.3f m/s',V);
+Re=(rho_air*V*D)/mu;