For conduction heat transfer in a constant area fin, efficiency increases with
For conduction heat transfer in a constant area fin, efficiency increases with
Homework Answers
For conduction, heat transfer in a constant area fin, efficiency increases with decreasing fin length because of the increase in gin temperature with length.
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For conduction heat transfer in a constant area fin, efficiency
increases with
3.25 For the heat sink shown in the accomping figure, find (a) the fin efficiency, (b)...
3.25 For the heat sink shown in the accomping figure, find (a)
the fin efficiency, (b) the surface efficiency, and (c) the heat
transfer from the heat sink.
Heat Sinks 3.25 ure, find (a) the fin efficiency, (b) the surface efficiency, For the heat sink shown in the accompanying fig- and (c) the heat transfer from the heat sink. T,, = 40°C 5 mm h = 16 W/m·K 4 cm 6061 aluminum 12 cm L= 25 cm To 90°C
The heat that is conducted through a body must frequently be removed by other heat transfer...
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of heat convection of...
Cooling fins are used to increase the area available for heat transfer between metal walls and...
Cooling fins are used to increase the area available for heat
transfer between metal walls and poorly conducting fluids such as
gases. A rectangular fin is shown in the following figure.
To design a cooling fin and calculate the fin efficiency one
must first calculate the temperature profile in the fin.
If L>>B, no heat is lost from the end or from the edges,
and the heat flux at the surface is given by:
in which the convective heat transfer...
Consider two walls, each kept at constant temperature T. and joining them is an aluminum fin...
Consider two walls, each kept at constant temperature T. and joining them is an aluminum fin of length L. There is internal heat generation q in this fin. Air flows over the fin having convective heat transfer coefficient h and temperature T.. Prove that the efficiency of the fin can be given by tanh (mL/2) mL/2 where m2 P= perimeter of the fin, A = area of the fin cross-section, and k = thermal conductivity of the fin. n =...
Considering the cooling process of a circular fin by means of convective heat transfer along its...
Considering the cooling process of a circular fin by
means of convective heat transfer along its length (see figure
below), governed by:
d dT where a is a parameter and T is the ambient temperature. The fin has a uniform temperature at the cross-sectional area (in the radial direction). The base (left side) of the fin is at a constant temperature TB of 120° and the top (right side) of the fine is fully insulated. Data: L = 1.0 m,...
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the...
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t = 3.0 mm, width Z = 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of...
4. Derive the fin heat transfer rate, qf, in two different ways. Use the long fin...
4. Derive the fin heat transfer rate, qf, in two different ways. Use the long fin approximation. You can use the usual notation learned in the class. (30 pt)
A) Describe radiation and conduction as modes of heat transfer; what are the key differences betw...
a) Describe radiation and conduction as modes of heat transfer; what are the key differences between them? [41 b) You are thinking of installing an observation window to a walk in fridge wall. Compare the rate of heat transfer of the original fridge wall (no window) with the new one (with window). The original wall has an area of 8m2 and is composed of three layers in series, 0.3 cm steel, 3 cm cork for insulation and a 2.5 cm...
PLEASE ANSWER a,b,c Heat Conduction Heat conduction occurs through any material, represented here by a rectangular...
PLEASE ANSWER a,b,c
Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
3.25 For the heat sink shown in the accomping figure, find (a)
the fin efficiency, (b) the surface efficiency, and (c) the heat
transfer from the heat sink.
Heat Sinks 3.25 ure, find (a) the fin efficiency, (b) the surface efficiency, For the heat sink shown in the accompanying fig- and (c) the heat transfer from the heat sink. T,, = 40°C 5 mm h = 16 W/m·K 4 cm 6061 aluminum 12 cm L= 25 cm To 90°C
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of heat convection of...
Cooling fins are used to increase the area available for heat
transfer between metal walls and poorly conducting fluids such as
gases. A rectangular fin is shown in the following figure.
To design a cooling fin and calculate the fin efficiency one
must first calculate the temperature profile in the fin.
If L>>B, no heat is lost from the end or from the edges,
and the heat flux at the surface is given by:
in which the convective heat transfer...
Consider two walls, each kept at constant temperature T. and joining them is an aluminum fin of length L. There is internal heat generation q in this fin. Air flows over the fin having convective heat transfer coefficient h and temperature T.. Prove that the efficiency of the fin can be given by tanh (mL/2) mL/2 where m2 P= perimeter of the fin, A = area of the fin cross-section, and k = thermal conductivity of the fin. n =...
Considering the cooling process of a circular fin by
means of convective heat transfer along its length (see figure
below), governed by:
d dT where a is a parameter and T is the ambient temperature. The fin has a uniform temperature at the cross-sectional area (in the radial direction). The base (left side) of the fin is at a constant temperature TB of 120° and the top (right side) of the fine is fully insulated. Data: L = 1.0 m,...
4. Derive the fin heat transfer rate, qf, in two different ways. Use the long fin approximation. You can use the usual notation learned in the class. (30 pt)
a) Describe radiation and conduction as modes of heat transfer; what are the key differences between them? [41 b) You are thinking of installing an observation window to a walk in fridge wall. Compare the rate of heat transfer of the original fridge wall (no window) with the new one (with window). The original wall has an area of 8m2 and is composed of three layers in series, 0.3 cm steel, 3 cm cork for insulation and a 2.5 cm...
PLEASE ANSWER a,b,c
Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
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