1. Determine the heat flow for (i) rectangular fins and (ii) triangular fin of 20 mm lengthand 3 mm base thickness. Thermal conductivity100 W/m2K, base temperature = 120°C surrounding fluid temperature = 35°C. Determinealso the fin effectiveness.2. A circumferential fin on a pipe of 50 mm OD is 3 mm thick and 20 mm long. Using theproperty values and other parameters in 1, determine the:= 45 W/m K. Convection coefficient h=(i)heat flow and effectiveness(ii)If the pitch is 10 mm, determine the increase in heat flow for 1 m length of pipe. Alsodetermine the total efficiency.Circumferential rectangular finRectangular and Triangular fins10010080802c60* 604040200.51.01.52.02.53.00.51.01.52.02.53.00.5h0.5hkAP1.51.5LRAPLe = L+A, = t(r2 - r) A, = 2M(r2,² – r,³)L =L+"2, = r, + LRectangular finA, = tL,L = LA, = 2L, (DepthTriangular finA, = L20Fin efficiency, %

Given-Data:- Length=20mm Base thickness=3mm thermal conductivity=45 W/m K h=100W/m2K base…

1. Determine the heat flow for (i) rectangular fins and (ii) triangular fin of 20 mm length and 3 mm base thickness. Thermal conductivity = 45 W/m K. Convection coefficient h= 100 W/m2K, base temperature = 120°C surrounding fluid temperature = 35°C. Determine also the fin effectiveness.

1. Determine the heat flow for (i) rectangular fins and (ii) triangular fin of 20 mm length and 3 mm base thickness. Thermal conductivity = 45 W/m K. Convection coefficient h= 100 W/m2K, base temperature = 120°C surrounding fluid temperature = 35°C. Determine also the fin effectiveness.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

1. Determine the heat flow for (i) rectangular fins and (ii) triangular fin of 20 mm length
and 3 mm base thickness. Thermal conductivity
100 W/m2K, base temperature = 120°C surrounding fluid temperature = 35°C. Determine
also the fin effectiveness.
2. A circumferential fin on a pipe of 50 mm OD is 3 mm thick and 20 mm long. Using the
property values and other parameters in 1, determine the:
= 45 W/m K. Convection coefficient h=
(i)
heat flow and effectiveness
(ii)
If the pitch is 10 mm, determine the increase in heat flow for 1 m length of pipe. Also
determine the total efficiency.
Circumferential rectangular fin
Rectangular and Triangular fins
100
100
80
80
2c
60
* 60
40
40
20
0.5
1.0
1.5
2.0
2.5
3.0
0.5
1.0
1.5
2.0
2.5
3.0
0.5
h
0.5
h
kAP
1.5
1.5
L
RAP
Le = L+
A, = t(r2 - r) A, = 2M(r2,² – r,³)
L =L+
"2, = r, + L
Rectangular fin
A, = tL,
L = L
A, = 2L, (Depth
Triangular fin
A, = L
20
Fin efficiency, %

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