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/EX12.5/12_5_Diffuse_emitter.sce | 45 ++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 534/CH12/EX12.5/12_5_Diffuse_emitter.sce

(limited to '534/CH12/EX12.5/12_5_Diffuse_emitter.sce')

diff --git a/534/CH12/EX12.5/12_5_Diffuse_emitter.sce b/534/CH12/EX12.5/12_5_Diffuse_emitter.sce
new file mode 100644
index 000000000..8d2f40319
--- /dev/null
+++ b/534/CH12/EX12.5/12_5_Diffuse_emitter.sce
@@ -0,0 +1,45 @@
+clear;
+clc;
+printf('FUNDAMENTALS OF HEAT AND MASS TRANSFER \n Incropera / Dewitt / Bergman / Lavine \n EXAMPLE 12.5   Page 748 \n')// Example 12.5
+
+// Total hemispherical emissivity
+// Total emissive Power
+// Wavelength at which spectral emissive power will be maximum
+
+T = 1600			;//[K] temperature of surface
+wl1 = 2            ;//[micro-m] wavelength 1
+wl2 = 5            ;//[micro-m] wavelength 2
+stfncnstt = 5.67*10^-8;		//[W/m^2.K^4] Stefan-Boltzmann constant
+// From the given graph of emissivities
+e1 = .4;
+e2 = .8;
+//From Equation 12.26 Black Body Radiation
+Eb = stfncnstt*T^4;        //[W/m^2]
+
+//Solution (A)
+//From Table 12.1 as wl1*T = 2*1600 (micro-m.K)
+F02 = .318;
+//From Table 12.1 as wl2*T = 5*1600 (micro-m.K)
+F05 = .856;
+//From Equation 12.36
+e = e1*F02 + e2*[F05 - F02];
+
+//Solution (B)
+//From equation 12.35
+E = e*Eb;
+
+//Solution (C)
+//For maximum condition Using Weins Law
+consttmax = 2898        ;//[micro-m.K]
+wlmax = consttmax/T;
+
+//equation 12.32 with Table 12.1
+E1 = %pi*e1*.722*10^-4*stfncnstt*T^5;
+
+E2 = %pi*e2*.706*10^-4*stfncnstt*T^5;
+
+printf("\n (a) Total hemispherical emissivity = %.3f \n (b) Total emissive Power = %i kW/m^2 \n (c) Emissive Power at wavelength 2micro-m is greater than Emissive power at maximum wavelength \n     i.e. %.1f kW/m^2 > %.1f kW/m^2 \n     Thus, Peak emission occurs at %i micro-m",e,E/1000,E2/1000,E1/1000,wl1);
+//END
+
+
+
-- 
cgit