Heat Conduction Along a Composite Bar

1119 words 5 pages
Heat Conduction along a Composite Bar
Objective
To study the conduction of heat along a composite bar and evaluate the overall heat transfer coefficient.
Theory
Thermal conduction is the mode of heat transfer which occurs in a material by virtue of a temperature gradient within it. A solid is chosen for the demonstration of pure conduction since both liquids and gasses exhibit excessive convective heat transfer. In a practical situation, heat conduction occurs in three detentions, a complexity which often requires extensive computation to analyse. In the laboratory, a single dimensional approach is required to demonstrate the basic law that relates rate of heat flow to temperature gradient and area.
For steady flow along the bar, the heat
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| Watt meter Q | (y2-y1) K | (x2-x1) m | dTdx | Thermal conductivity kH W/mK | 1 | 2.5 | -2 | 0.02 | -100 | 50.93 | 2 | 5 | -4 | 0.02 | -200 | 50.93 | 3 | 7 | -4.6 | 0.02 | -230 | 62 | Average Thermal Conductivity, kH | 54.62 |

Table 2(ii): Calculation for thermal conductivity, kS Test No. | Watt meter Q | (y2-y1) K | (x2-x1) m | dTdx | Thermal conductivity kS W/mK | 1 | 2.5 | -4.5 | 0.04 | -112.5 | 45.27 | 2 | 5 | -16.1 | 0.04 | -402.5 | 25.31 | 3 | 7 | -19.1 | 0.04 | -477.5 | 29.86 | Average Thermal Conductivity, kS | 33.48 |

Table 2(iii): Calculation for thermal conductivity, kC Test No. | Watt meter Q | (y2-y1) K | (x2-x1) m | dTdx | Thermal conductivity kC W/mK | 1 | 2.5 | -0.5 | 0.02 | -25 | 203.71 | 2 | 5 | -0.6 | 0.02 | -30 | 339.51 | 3 | 7 | -0.5 | 0.02 | -25 | 570.38 | Average Thermal Conductivity, kC | 371.2 |

Calculation using thermal

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