Development and validation of an improved heat transfer calculation model for rough tubes
Palabras clave:
factor de fricción , coeficiente de transferencia de calor de rugosidad equivalente, desviación media, tubos rugosos, modelo cinéticoResumen
An improved method for heat transfer calculation inside rough tubes is provided. The model has been obtained from a second assessment developed early by the authors on fluid flow in single-phase inside rough tubes. The proposed correlation has been verified by comparison with a total of 1 666 experimental available data of 34 different fluids, including air, gases, water and organic liquids. The proposal model covers a validity range for Prandtl number ranging from 0.65 to 4.52x104 values of Reynolds number from 2.4x103 to 8.32x106, a range of relative roughness ranging from 5x10-2 to 2x10-6 and viscosity ratio from 0.0048 to 181.5. The proposed model provides a good correlation for 104≤Re and Re<104, with an average error of 18.3% for 70.4% of the data and 16.6% for 74.8% of the data, respectively. The method presents a satisfactory agreement with the experimental data in each interval evaluated; therefore, the model can be considerate accurate enough for practical application. At the present time, in the available technical literature, a method with similar characteristics is unknown.Descargas
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Derechos de autor 2024 yanan Camaraza-Medina, Yamilka Blanco-Garcia, Ken
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