Experiments for Determining the Thermal Conductivity of Brass and 304 Stainless Steel with Direct Temperature Measurement Techniques Using Lorenz Number as Validation
- 10.2991/aer.k.211106.020How to use a DOI?
- Experiment; Direct Measurement; Thermal Conductivity; Electrical Conductivity; Lorenz Number; Brass; 304 Stainless Steel
The quantity of heat transferred through a connecting rod from two sources of different temperatures with time is proportional to the thermal conductivity of the substance. In this study, the experiment was conducted to determine the thermal conductivity of brass and 304 stainless steels by direct temperature measurement. Then the value of thermal conductivity obtained was tested using Wiedemann and Franz’s law through the determination of Lorenz number. The experiment was started by determining the rate of heat changes due to environmental influences from a calorimeter filled with cold water. The value obtained is a correction of the environmental influence on the system, which is 1.69 J/s. The value of the heat energy transferred with time by the rod for brass is 0,811 J/s with an average mean absolute percentage error by 19,2% and 304 stainless steel is 0,087 J/s with an average mean absolute percentage error by 9,1%. The result showed that brass thermal conductivity was 146,87 W/m.K and 304 stainless steel was 15,03 W/m.K. Based on Wiedemann-Franz’s investigation of the thermal conductivity of several metals at room temperature, it was proportional to the electrical conductivity. After getting the thermal conductivity value, the measurement was continued by determining the electrical conductivity value. The result showed that brass electrical conductivity was = 1,47x107 (Ω.m)-1 and 304 stainless steel was =0,14x107 (Ω.m)-1. If the measurements were carried out at an average room temperature of 300 K, the Lorenz number for each test rod could be obtained. Lorenz’s number of brasses was 2,5x10-8 (W.Ω.K-2) and 304 stainless steel was 3,5x10-8 (W.Ω.K-2). When compared to the literature, the result of the Lorenz number shows good agreement, the difference that occurs is due to differences in the temperature. This shows that the experiment to determine the thermal conductivity of brass and 304 stainless steels by direct temperature measurement has been tested well and can be applied to other types of metal materials.
- © 2021 The Authors. Published by Atlantis Press International B.V.
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Cite this article
TY - CONF AU - Ratu Fenny Muldiani AU - Kunlestiowati Hadiningrum AU - Defrianto Pratama PY - 2021 DA - 2021/11/23 TI - Experiments for Determining the Thermal Conductivity of Brass and 304 Stainless Steel with Direct Temperature Measurement Techniques Using Lorenz Number as Validation BT - Proceedings of the 2nd International Seminar of Science and Applied Technology (ISSAT 2021) PB - Atlantis Press SP - 123 EP - 129 SN - 2352-5401 UR - https://doi.org/10.2991/aer.k.211106.020 DO - 10.2991/aer.k.211106.020 ID - Muldiani2021 ER -