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Thermal Conductivities of Oven Mitts. Jordan Holmes Stephen Merrill. Objective. Our goal was to find the thermal conductivities (k) of different kinds of gloves. We tested the following: Conventional Oven Mitt Polymer Oven Mitt Snow Glove Dishrag . Procedure.
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Thermal Conductivities of Oven Mitts Jordan Holmes Stephen Merrill
Objective Our goal was to find the thermal conductivities (k) of different kinds of gloves. We tested the following: • Conventional Oven Mitt • Polymer Oven Mitt • Snow Glove • Dishrag
Procedure • We used an aluminum block to calculate the rate of heat transfer from the stove top. • Using this rate of heat transfer we measured the temperatures of the inside of each glove after reaching steady state in contact with the aluminum block. • We then calculated the thermal conductivity for each material.
Measurements • Stove • T = 108°C • Aluminum Block • A = .051*.089 = .00454 m2 • L = .0126 m • T = 85°C • k = 237 W/m*K • Heat Transfer Rate • q = (108-85)*237*.00454/.0126 = 1964 W • Conventional Oven Mitt • T = 70°C • L = .0025 m • TAl = 85°C • Polymer Oven Mitt • T = 80°C • L = .003 m • TAl = 105°C Assumptions • Aluminum block is pure aluminum • Constant surface temperatures • Temperatures measured after 5 minutes • Snow Glove • T = 80°C • L = .0045 m • TAl = 105°C • Dishrag • T = 82°C • L = .0045 m • TAl = 111°C
Results k = q*L/[A*(TAl –T)] • Conventional Oven Mitt • k = 1964*.0025/(.00454*15) = 72.1 W/m*K • Polymer Oven Mitt • k = 1964*.003/(.00454*17) = 76.34 W/m*K • Snow Glove • k = 1964*.0045/(.00454*25) = 77.9 W/m*K • Dishrag • k = 1964*.0045/(.00454*29) = 67.13 W/m*K
Conclusion Most of these gloves have similar thermal conductivities but the snow glove is the most conductive. We concluded that a dishrag can be just as useful as an oven mitt or better for getting hot things out of the oven because it has a lower thermal conductivity.