From 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 Mon Sep 17 00:00:00 2001
From: prashantsinalkar
Date: Tue, 10 Oct 2017 12:27:19 +0530
Subject: initial commit / add all books

---
 534/CH12/EX12.9/12_9_Brick_Wall.sce | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 534/CH12/EX12.9/12_9_Brick_Wall.sce

(limited to '534/CH12/EX12.9/12_9_Brick_Wall.sce')

diff --git a/534/CH12/EX12.9/12_9_Brick_Wall.sce b/534/CH12/EX12.9/12_9_Brick_Wall.sce
new file mode 100644
index 000000000..55c598a70
--- /dev/null
+++ b/534/CH12/EX12.9/12_9_Brick_Wall.sce
@@ -0,0 +1,35 @@
+clear;
+clc;
+printf('FUNDAMENTALS OF HEAT AND MASS TRANSFER \n Incropera / Dewitt / Bergman / Lavine \n EXAMPLE 12.9   Page 766 \n')// Example 12.9
+
+// Total hemispherical emissivity of fire brick wall
+// Total emissive power of brick wall
+// Absorptivity of the wall to irradiation from coals
+
+Ts = 500			;//[K] temperature of brick surface
+Tc = 2000           ;//[K] Temperature of coal exposed
+stfncnstt = 5.67*10^-8;		//[W/m^2.K^4] Stefan-Boltzmann constant
+// From the given graph of emissivities
+e1 = .1;    //between wavelength 0 micro-m- 1.5 micro-m
+e2 = .5;    //between wavelength 1.5 micro-m- 10 micro-m
+e3 = .8;    //greater than wavelength 10 micro-m
+
+//From Table 12.1
+//For wl1 = 1.5 micro-m and T = 500 K, At wl1*T = 750 micro-m.K
+F0wl1 = 0;
+//For wl2 = 10 micro-m and T = 500 K, At wl2*T = 5000 micro-m.K
+F0wl2 = .634;
+//From equation 12.36
+e = e1*F0wl1 + e2*F0wl2 + e3*(1-F0wl1-F0wl2);
+
+//Equation 12.26 and 12.35
+E = e*stfncnstt*Ts^4;
+
+//From Table 12.1
+//For wl1 = 1.5 micro-m and T = 2000 K, At wl1*T = 3000 micro-m.K
+F0wl1c = 0.273;
+//For wl2 = 10 micro-m and T = 2000 K, At wl2*T = 20000 micro-m.K
+F0wl2c = .986;
+ac = e1*F0wl1c + e2*[F0wl2c-F0wl1c] + e3*(1-F0wl2c);
+
+printf('\n Total hemispherical emissivity of fire brick wall = %.3f \n Total emissive power of brick wall = %i W/m^2.\n Absorptivity of the wall to irradiation from coals = %.3f',e,E,ac);
\ No newline at end of file
-- 
cgit