Stainless Steel Cross
issue of physical temperature?
A 20 cm long copper cylinder has a cross-sectional diameter of 2 cm. The two ends of the rod control surface contact temperature, aa 0 degrees C and the other at 200 degrees CA what is the power that is transmitted through the copper rod surface Cold? B. what happens to your response in A., if we halve the length of the bar? C. what happens if your response rather than twice the diameter of the cross section? D. what happens to your response if instead of copper, 302 stainless steel used?
You're asking a question to understand the law Forio heat conduction. Q as is said: "=- k * dT / dx This means that the heat flux (measured in watts / meter ^ 2) flowing in the direction of x, is given by the refusal of the conductivity multiplied by the temperature gradient of x-direction. Macroscopically extend this to our thread, we have the following (assuming a uniform distribution of heat conductivity and uniform) Q_dot = k * A * (T2 – T1) / L Q_dot: heat flux (measured in Watts) k: conductivity: Section cross. For a cylinder this is A = Pi * d ^ 2 / 4 T2: T1 highest temperature: low temperature L: length of wire that can find the thermal conductivity Copper: k = 400 W / (MC) Plug Data: k = 400 W / (MC) d: = 0.02 m L: T2 = 0.2 m: T1 = 200 C: = 0 CA: Q_dot = k * Pi * D ^ 2 * (T2 – T1) / (4 * L) = 125.66 watts Q_dot B: Half of rod length, L = 0.1m Q_dot = 251.33 watts This effect doubles the heat driven, because there is half the resistance copper through travel. C: double diameter, d = 0.04 m, L back to L = 0.2 m = 502.65 Watts Q_dot This effect quadruples the heat conducted because we can 4 times more space to pass through (think four times as many lane road) D: select 302 stainless steel. It chooses to bring a different flavor out through. back again add = 0.02 m Search conductivity: k = 16.2 W / mC Q_dot = 20.36 watts. This effect reduces heat transfer because we selected a flavor that is much more reluctant to transfer heat, making it an insulator. This is one reason why the stainless steel makes it a food utensil because they want less heat to transfer to the hand when using the tools to handle hot foods. Also, why copper makes a good pipe for use within a heat exchanger.
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