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Searle - Searles Bar Abstract This experiment examined the...

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Searle’s Bar. Abstract: This experiment examined the thermal conductivity of the metal, Copper. The experiment was carried out twice, with the mass flow rate of water being increased for the second trial and the thermal conductivity was determined for each flow rate using the two equations that will be detailed later in this report. Results showed that the thermal conductivity was lower using both equations when the mass flow rate of water was increased. Introduction. The basis of this experiment is to determine the thermal conductivity of a copper sample. Copper is regarded as a good conductor so the Searle’s Bar method was used. If we were looking at a poor conductor, another method, such as the Lee’s Disc method may be used. The SI units of thermal conductivity are W/mK but we are using W/m ° C as this is also a viable unit. We know that there will be no alterations to the relative positions of the molecular particles in the sample so therefore we know that conduction is taking place, as opposed to the other two main processes of heat transfer, convection and radiation. For results to be obtained, we will need to find out the temperature differences between the thermometers that are positioned at either end of the material, i.e. Copper, and at either end of the cooling coil. We will be examining how the characteristics of the material affect the transfer of heat through the sample and also how this may affect it use in different aspects of the construction world. From these results, we may then be able to analyse how we can maximise the materials properties to the benefit of building projects. Barry Heffron Student No. 10401006 Session B2 Group 8 1

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Equation 1 At equilibrium: Rate of heat flow along bar = Rate of heat extraction due to cooling; therefore ( 29 ( 29 1 2 4 3 Θ - Θ Θ - Θ = A Mxlxc k = W/m ° C Where: K = Thermal conductivity (W/ m ° C) A = Cross sectional area of bar (m 2 ) 4 1 Θ Θ to = Readings from thermometers ( ° C) l = Spacing of thermometers along bar (m) M = Mass flow rate (Kg/s) C = Specific heat capacity of water (4186.8 J/kg ° C) Equation 2 At equilibrium Rate of heat flow along bar = Rate of electrical input ( 29 1 2 Θ - Θ = A VxIxl k = W/m ° C Where: K = Thermal conductivity (W/ m ° C) A = Cross sectional area of bar (m 2 ) 2 1 Θ Θ to = Readings from thermometers ( ° C) l = Spacing of thermometers along bar (m) V = Volts I = Amps Barry Heffron Student No. 10401006 Session B2 Group 8 2
Apparatus.

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