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- Title
Método para estimar las constantes de la ley logarítmica.
- Authors
Mendoza-González, Ángel; Aguilar-Chávez, Ariosto
- Abstract
This paper presents a procedure to determine the empirical constants of von Kármán and additive of the law of logarithmic velocity distribution, is based on a global estimation of the minimum values of error between the logarithmic law model and the data of a measurement. To verify the goodness of the proposed method, a comparison was made with other methods presented in the literature, using the data of a velocity profile obtained in a variable slope channel of rectangular section, with an Acoustic Doppler Velocimeter (ADV). The experimental test was in uniform flow with bed roughness Ks = 0.000535 m and Reynolds number Re > 36 000. The proposed method allows to simultaneously estimate the empirical constants κ and A, locating an optimal value called Emin in a two-dimensional plane of error estimation of the constants. The results of the proposed method compared to others reported in the literature indicate an improvement or at least a similar estimate. In addition, the adjustment of the logarithmic law with the values obtained from the experimental test in the established range 30 < y+ < 0.3δ+ was verified, using the calculated values of κ and A with the proposed method.
- Subjects
REYNOLDS number; DOPPLER velocimetry; VELOCITY; DATA modeling; LITERATURE; STOKES equations
- Publication
Tecnología y Ciencias del Agua, 2019, Vol 10, Issue 5, p154
- ISSN
0187-8336
- Publication type
Article
- DOI
10.24850/j-tyca-2019-05-06