Services on Demand
Journal
Article
Indicators
Cited by SciELO
Access statistics
Related links
Similars in SciELO
Share
Educación química
Print version ISSN 0187-893X
Abstract
DURAN PERALTA,, Héctor Armando; MAYORGA BETANCOURT, Manuel Alejandro and CORDOBA CASTRILLON, Luis Fernando. Practice for the determination of convective coefficients. Educ. quím [online]. 2020, vol.31, n.4, pp.21-34. Epub July 30, 2021. ISSN 0187-893X. https://doi.org/10.22201/fq.18708404e.2020.4.75419.
This paper shows the determination of heat transfer coefficient in natural convection, using temperature data in interval form around the bulb of a mercury-filled glass thermometer. For this purpose, an experiment was performed, recording the descending data of the meniscus in the capillary thermometer. Two heat transfer models were constructed, and the analytical solutions were generated. In the first model, the temperature of the mercury bulb was considered equal to the temperature of the glass container, while in the second model this restriction was not considered. With the analytical solutions of these models and using a modified least squares method to work with data read in the interval form, the experimental coefficient of heat transfer was determined in the range of measured data. To validate both models, the calculated temperatures were plotted and compared with the experimental data. Results show that the heat transfer coefficient calculated with the unrestricted model is the one that best represents the experimental data.
Keywords : Heat transfer coefficient; data interval; natural convection; glass thermometer; transient flow.