H1 Thermal Conductivity of Metals.pdf - Lab 1 Thermal Conductivity Mechanical Engineering Labs Thermal Fluid Lab ME 455 Prof Taha Aldoss Objectives 1

H1 Thermal Conductivity of Metals.pdf - Lab 1 Thermal...

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3/6/2019 1 Lab. 1 Thermal Conductivity Mechanical Engineering Labs. Thermal Fluid Lab, ME 455 Prof. Taha Aldoss Objectives: 1. Calculate the average value of thermal conductivity of the solid from measurements. 2. Consider the following thermal conductivity table below, and find the closest material representing the tested material. 3. Calculate the accuracy of the measured k.
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3/6/2019 2 Theory: Applying the Fourier’s Law , one can calculate the heat flux, q x , conducted through a conductor with material thickness of Δx, where (1) Fig. 1. Assume one-dimensional flow of heat, i.e. there is no flow of heat in the other two directions, y, and z. This can be achieved if the conductor is well insulated at other sides. Then the above equation can be simplified and becomes as follows: Now to achieve a constant heat flux through the conductor, we apply a source of heat at the one side, and a heat sink at the other side of the conductor. In the present experiment we use an electrical heater at the first side and a flow of a cooling water at the other side of the conductor. (2) Electrical Heater T win T wout Water Flow in Water Flow out Fig. 2.
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3/6/2019 3 q w = m w C pw (T wout – T win ) where q w is the rate of heat absorbed by the cooling water , Btu/hr or W m w is the mass flow rate of the cooling water , lb m /s or kg/s C pw is the specific heat of the water , Btu/lb m / o F or J/kg/ o C T wout is the outlet temperature of the water , o F or o C T win
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