Effect of the Size of A5N Cylindrical Aluminum Specimens on the Cooling Kinetics
DOI:
https://doi.org/10.48048/tis.2022.3536Keywords:
A5N aluminum, Cooling, Convection, Thermal radiation, Size effect, Temperature dependenceAbstract
The results of the study of “The influence of the size of cylindrical samples of A5N aluminum on the time and the rate of their cooling” are reported. According to experimental data, the temperature dependence of the heat transfer coefficient for pure metals is calculated. It has revealed that the process of cooling of the aluminum and its alloys has a relaxation behavior. It was found that the main mechanisms of natural air cooling are convection heat transfer and radiation. The characteristic cooling time due to radiation is less due to convection. The contribution of thermal radiation is noticeable at high temperatures. It was found that the characteristic times of cooling due to radiation and convection increase with increase in volume to area ratio of the sample.
HIGHLIGHTS
- Cylindrical Al samples were made with dimensions of 2, 2.5, 3, 3.5 and 4 cm, after cleaning aluminum to grade A5N (99.999 %)
- The influence of the dimensions of cylindrical aluminum samples on the time and rate of their spontaneous cooling in air has been studied
- It has been established that the samples are cooled mainly due to convective heat transfer and thermal radiation
- It became known that the cooling time due to convection is longer than the time due to radiation
- It has been found that as the V/S value increases, the cooling time increases
GRAPHICAL ABSTRACT
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